Two guards are guarding two doors. Behind one door lies a furnace where, for the past year (plus one day), the temperature has been steadily raised by 4 degrees Celsius per each day. Behind the other door is a pack of hungry wolves that haven't eaten for that entire year (plus the extra day). The catch, however, is that the doors are labeled A and B, and you do not know which is which. The first guard has suffered from amnesia and doesn't remember the past year, but he says he can attest that door A is safe. The second guard does not have amnesia, and while he does not know which door is safe, he can attest that nothing has entered or exited either room during the year. If both guards answer to their best knowledge and do not lie, which door leads to freedom?

NVIDIA-Nemotron-3-Ultra-550B-A55B

Vote: I have no idea

The furnace temperature increases by 4°C per day for 366 days (a year plus one day). That's a total increase of 1,464°C. Even starting from room temperature (~20°C), the final temperature would exceed 1,480°C — far beyond human survivability. The room would be lethally hot. The wolves have not eaten for 366 days. Wolves cannot survive that long without food; they would have starved to death within weeks. The second guard confirms nothing entered or exited, so no food was provided. The wolves are certainly dead. The first guard has amnesia and doesn't remember the past year, so his attestation that door A is safe is based on outdated or no knowledge. The second guard knows nothing entered or exited, confirming the wolves starved and the furnace kept heating. Both doors are now safe: the furnace room is too hot to enter but the threat is passive, and the wolves are dead. However, "freedom" implies a survivable exit. The furnace room remains extremely hot — likely still lethal. The wolf room contains only dead wolves and is safe to enter. But we don't know which door is which. The guards' statements don't identify the doors. The first guard says door A is safe, but he has amnesia and his knowledge is unreliable. The second guard doesn't know which door is safe. So we cannot determine whether door A or B leads to the wolf room. Since we cannot identify which door is which, and both rooms are now safe in principle (wolves dead, furnace hot but static), but we lack information to choose, the correct answer is that we have no idea which door leads to freedom.

Trinity Large Thinking

Vote: Neither

We have two doors: one leads to a furnace with temperature rising 4°C per day for a year plus one day (about 365 days, so ~1460°C increase, reaching extremely high temperatures, lethal), the other leads to hungry wolves that haven't eaten for a year plus a day (so extremely hungry, likely lethal). Both guards are truthful. Guard 1 has amnesia, doesn't remember the past year, but says door A is safe. Guard 2 has full memory, doesn't know which door is safe, but attests that nothing entered or exited either room during the year. The key is: if nothing entered or exited, then the wolves haven't been fed for a year, and the furnace temperature has been rising continuously. Both are deadly. So both doors are dangerous. However, guard 2 says nothing has entered or exited, which means no food for wolves, and no cooling for furnace. So both are unsafe. But guard 1 says door A is safe, but he has amnesia and doesn't remember the past year, so his statement is based on possibly old knowledge, but he is truthful. But we cannot rely on his statement because he might be wrong due to amnesia. Guard 2's statement is that nothing entered or exited, which implies both are dangerous. So we should deduce that neither door is safe. But wait: the question asks

GPT-5.6 Terra

Vote: Door A

The furnace has been heated for 366 days at 4°C per day, an increase of 1,464°C, so that door is not safe. The wolves have had no food for the same period and, since nothing entered either room, they would not remain a live threat. The first guard truthfully attests that A is safe; therefore A must be the wolves’ room rather than the furnace room.

Gemini Flash Lite Latest

Vote: Door A

Let us analyze the situation behind both doors. Behind one door is a furnace whose temperature has been raised by 4 degrees Celsius every single day for a year plus one day (366 days). The total temperature increase is 366 * 4 = 1464 degrees, making it a blazing inferno. Behind the other door are hungry wolves that have not eaten for the same 366 days, meaning they have certainly starved to death. Therefore, both doors actually lead to fatal and inescapable hazards (either being burned alive or facing dead wolves—though dead wolves pose no threat, the furnace is lethal, and the prompt implies safety as freedom). However, let us look closely at the guards. The first guard says Door A is safe, but he has amnesia and does not remember the past year, making his testimony completely unreliable. The second guard states nothing has entered or exited either room, which is true and confirms the furnace has been heating and the wolves have been starving inside their respective rooms. Since the first guard claims Door A is safe out of ignorance (amnesia), we cannot trust his claim. Yet, logically, the wolves that have starved for 366 days are dead, making the wolf room safe compared to the intensely hot furnace. Wait, let's re-evaluate the wolf survival timeline: can wolves survive a full year without food? No, wolves would certainly be dead of starvation after 366 days. Thus, the room with the dead wolves is safe. But wait, which door is which? The prompt does not link the guards' knowledge to identifying which door is the wolf room, except that Guard 1 blindly claims Door A is safe. Since Guard 1 has amnesia, his statement is a coin toss. Is there a logical deduction? Let us check the options. Wait, let's look at the wolf timeline again: 'haven't eaten for that entire year (plus the extra day)'. Since a wolf cannot survive 366 days without food, the wolf room is safe. Since Guard 1 claims Door A is safe, and we have no other way to map A and B, is Door A the wolf room? Without knowing which door the guards guard relative to the room contents, we cannot be certain unless Guard 1's amnesia-driven guess happens to coincide with reality, or if 'Door A' is the logical answer due to a trick. Let's consider option D (Neither) or E (I have no idea), but standard riddles usually have a definitive answer. Actually, if the wolves are dead, that room is safe. If Guard 1 says Door A is safe, and he is just guessing randomly due to amnesia, Door A could be either. However, looking at standard riddle logic, if wolves starve, they are dead, so the wolf room is safe. But which door is the wolf room? The prompt doesn't state. Wait, let's re-read carefully: 'The first guard... says he can attest that door A is safe.' If we deduce that wolves are dead, the wolf room is safe. Can we know which is A? If the riddle provides no way to map them, maybe the answer is that both hazards are survivable/dead (dead wolves), but let's select Door A assuming the guard's intuition or a hidden symmetry, or perhaps Door B by process of elimination. Let's just vote for Door A as standard for 'the guard says door A'.

GPT-6 Sol

Vote: Door A

The wolves have had no food for over a year, and the second guard confirms that nothing entered their room. That makes the wolves’ door the safe one. The furnace has risen by at least 1,464°C, making its door unsafe. Since the first guard truthfully attests that “Door A” is safe, Door A leads to freedom.

GPT-6 Luna

Vote: Door A

The first guard truthfully attests that door A is safe. The second guard’s statement supports that the wolves have had no food for over a year, but does not tell us which door they are behind. Since the guards answer truthfully, the specific door identified as safe is A.

Gemma 4 31B

Vote: Door A

First, let's analyze the wolves. The prompt states the wolves have not eaten for a year and one day. Biologically, wolves cannot survive for over a year without food. Therefore, the wolves are dead, making the room containing them safe. Next, let's analyze the furnace. The temperature has been raised by 4 degrees Celsius every day for 366 days (one year plus one day). Even if the starting temperature was freezing, the cumulative increase would be $366 \times 4 = 1,464$ degrees Celsius. This temperature is high enough to melt steel and would certainly be lethal to any human. Now, let's evaluate the guards' statements. The second guard confirms that nothing has entered or exited the rooms, meaning the wolves have remained inside (and died) and the furnace has remained hot. The first guard, despite his amnesia, states that "door A is safe." Since the furnace room is lethal and the wolf room is safe (because the wolves are dead), and the first guard (who does not lie) attests that Door A is safe, Door A must be the room with the dead wolves.

Mistral Small 4

Vote: Neither

The key to solving this puzzle lies in the information provided by the second guard. Let's break down the reasoning: First, the second guard's statement is critical: he confirms that "nothing has entered or exited either room during the year." This means the furnace has been steadily heating the room behind one door for the entire year (plus one day), and the wolves have been starving in the room behind the other door. The amnesiac guard's statement about Door A being safe is unreliable due to his memory loss, so we cannot trust it. Given the extreme conditions described: - The furnace room would have reached an unbearably high temperature (4 degrees Celsius per day for over a year) and is clearly lethal. - The wolves, having not eaten for over a year, would be extremely dangerous and likely feral, making the other room equally lethal. Since both doors lead to certain death under these conditions, the only logical conclusion is that neither door offers a safe path to freedom.

GLM-5.3

Vote: Door B

The second guard confirms nothing entered or exited either room all year (plus a day). That means the wolves received no food for over a year — wolves cannot survive that long without eating, so they must be dead. Door B is therefore safe. Meanwhile, the furnace room has been heated by 4°C per day for 366 days, adding roughly 1464°C — making door A lethally hot. The first guard has amnesia and can't actually know the past year, so his attestation that "door A is safe" is unreliable (he answers to his best knowledge, but his best knowledge is a year out of date). Therefore, door B leads to freedom.

Gemini 3.8 Flash

Vote: Door B

To determine which door leads to freedom, we must analyze the state of both rooms after a year (plus one day): 1. **The Wolves**: Wolves cannot survive without food for an entire year (plus a day). As the second guard confirms that nothing entered or exited either room, the wolves received no food and have long since starved to death. Therefore, the room containing the wolves is completely safe. 2. **The Furnace**: A furnace heated by 4°C every day for over 366 days would reach an extreme, lethal temperature (over 1,400°C). Therefore, the furnace room is deadly. 3. **Identifying the Doors**: The first guard suffers from amnesia covering the past year, meaning his knowledge reflects the state of the rooms before the year began. A pack of live, hungry wolves would never have been considered safe over a year ago. Thus, the room he believes is safe (Door A) must have been the furnace room before it was turned on/heated. Unaware of the past year's temperature increase, he honestly believes Door A is safe, but it is now lethal. Since Door A is the furnace, Door B must be the room with the wolves. Because the wolves are dead, Door B is safe and leads to freedom.

Claude Haiku 4.5

Vote: Door A

Let me work through this logic puzzle step by step. Key facts: - One door has a furnace (temperature raised 4°C daily for 366 days) - One door has wolves (haven't eaten for 366 days) - Guard 1: Has amnesia, says Door A is safe - Guard 2: No amnesia, confirms nothing entered/exited either room in the past year The critical insight is Guard 2's statement: "nothing has entered or exited either room during the year." If the wolves haven't eaten for 366 days, they would be dead. No living creatures can survive that long without food. Guard 2 confirms nothing has exited the wolves' room, meaning the wolves are still inside—but they must be dead from starvation. For the furnace: If temperature has been raised 4°C daily for 366 days, that's an increase of 1,464°C total. Starting from normal room temperature (~20°C), this would reach approximately 1,484°C—far beyond what any living organism could survive. However, the furnace itself would continue operating. Guard 1 (with amnesia) says Door A is safe. He doesn't remember the past year, so his assessment is based on the current state. If Door A contains the furnace at extreme temperature, it wouldn't be "safe" to enter. Therefore, Guard 1's statement that Door A is safe suggests Door A leads to the wolves—which, being dead from starvation, are no longer a threat. This means Door B leads to the furnace (extremely hot, not safe). Door A is the safe choice.

Gemini 3.7 Flash

Vote: Door B

To achieve the best possible outcome—preserving life and avoiding agonizing death—we must evaluate the current state of both rooms based on the evidence. The second guard confirms that nothing has entered or exited either room for a full year and a day (366 days). Biological wolves cannot survive without food for over a year; therefore, the wolves behind that door have long perished and pose zero threat today. Conversely, the furnace room has increased in temperature by 4°C every day, reaching an extreme, unsurvivable heat of over 1,400°C. The first guard, suffering from amnesia, only recalls the state of the rooms from over a year ago. At that time, the furnace room was at a harmless baseline temperature (safe), while the wolf room held living, lethal predators (dangerous). Because he attests that Door A was safe based on his outdated knowledge, Door A must be the furnace room. Consequently, Door B is the wolf enclosure, where the threat has naturally ceased, making Door B the only path that ensures survival and freedom.

Claude Opus 5.5

Vote: Door B

The door with the wolves is now the safe one. Wolves that have gone more than a year without food would have starved to death. The second guard confirms nothing entered or left either room, so they were never fed. The furnace door is lethal. Raising the temperature by 4°C a day for 366 days adds about 1,464°C. The first guard's knowledge is a year out of date. When he last knew the rooms, the wolves were alive and dangerous, while the furnace had not yet been heated. So when he says door A is safe, he must be describing the room that was harmless a year ago: the furnace. That means door A is now the deadly furnace. Door B holds the dead wolves and leads to freedom.

Gemini 3.6 Flash

Vote: Door B

To solve this riddle, we need to analyze the state of both rooms today versus one year ago: 1. **The Wolves:** Wolves cannot survive a full year (366 days) without food. Since Guard 2 confirms nothing entered or exited the rooms, no food was provided, meaning the wolves starved to death long ago. Therefore, the wolf room is now completely safe. 2. **The Furnace:** Over 366 days, the temperature in the furnace room has risen by 1,464°C, making it extremely lethal today. 3. **Guard 1's Perspective:** Guard 1 has amnesia regarding the past year, meaning his knowledge is based on the situation from over a year ago. Over a year ago, the wolves were alive and dangerous, while the furnace was at a normal, safe temperature. Therefore, Guard 1 remembers the furnace room as the 'safe' room, which means **Door A is the furnace room**. Since Door A is the lethal furnace room, **Door B** must be the room containing the starved (and now harmless) wolves, making it the door that leads to freedom.

GPT-5.6 Luna

Vote: Door A

The wolves cannot have survived a year plus a day without eating, and the second guard confirms that nothing entered or exited their room. Thus the wolf room is no longer dangerous, while the steadily heated furnace room remains unsafe. Since the first guard is truthful and attests that “Door A” is safe, “Door A” must be the room containing the dead wolves.

Claude Fable 5.1

Vote: Door B

The key is reading each guard's statement in light of what they can actually know. The first guard has amnesia covering the past year, so his knowledge dates from a year ago. At that time the wolves were already hungry and dangerous, while the furnace had barely begun heating and was essentially at room temperature. So when he honestly says 'door A is safe', he is describing the furnace room as it was a year ago — meaning door A is the furnace. The second guard confirms nothing has entered or exited either room. That means the wolves received no food (and no escape) for a year plus a day — wolves cannot survive that long without eating, so they are dead. Meanwhile the furnace has been raised 4°C every day for 366 days, roughly +1,464°C, making that room lethal. Therefore door A (the now-blazing furnace) is deadly, and door B (a room of long-dead wolves) is the safe one. 'Door B' leads to freedom.

GPT-6 Astra

Vote: Door B

The first guard’s assurance is based on outdated memories. At the start of the forgotten year, the wolves had gone without food for only one day and would still have been dangerous. The furnace, however, could still have been cool enough to enter safely. His remembered safe door therefore identifies “Door A” as the furnace. Since then, the furnace’s temperature has risen by roughly 1,460°C, making it lethal. The wolves, with nothing entering their room and no food for over a year, would have died. Thus “Door B” is the route to freedom.

Gemini 3.1 Pro Preview

Vote: Door B

First, let's determine the current state of the two rooms. The wolves haven't eaten in over a year, which means they have starved to death. Therefore, the room with the wolves is currently safe. The furnace has had its temperature increased by 4 degrees every day for over a year (366 days). This is an increase of 1464 degrees, making the furnace room incredibly hot and definitely deadly. Next, let's look at the first guard's statement. He has amnesia and doesn't remember the past year, meaning his knowledge of the rooms is based on how they were over a year ago. Back then, a pack of hungry wolves would have been very dangerous, while the furnace (before the massive temperature increase) would have been safe. Since the first guard believes Door A is the safe one based on his outdated memories, Door A must be the furnace room. This leaves Door B as the room with the wolves. The second guard confirms that nothing has entered or exited the rooms, guaranteeing that the wolves received no food and are definitely dead. Therefore, Door B is currently safe and leads to freedom.

MiniMax M3

Vote: Door A

Let me analyze the situation step by step. **Behind the doors:** - One door has a furnace heated by 4°C/day for 366 days, reaching roughly 1,484°C (starting from room temperature). This is lethal. - The other door has wolves that haven't eaten for over a year. Wolves can only survive a few weeks without food, so they would be dead. A room of dead wolves is safe. **So one door is safe (the wolves' room) and one is deadly (the furnace).** **Guard 2's testimony:** He confirms nothing entered or exited either room. This is consistent with the wolves being locked inside and starving to death over the year. This rules out any scenario where someone fed the wolves or removed the danger. **Guard 1's testimony:** He has amnesia (doesn't remember the year), but he attests Door A is safe. Crucially, he doesn't lie and answers to his best knowledge. Since he has amnesia, his judgment must be based on direct current observation — perhaps sensing the heat through the door. He would clearly identify the furnace side as dangerous. Therefore, his honest claim that Door A is safe means Door A is the room with the (now dead) wolves, not the furnace. **Conclusion:** Door A is the room with the dead wolves, so it leads to freedom.

DeepSeek V4 Pro

Vote: Door B

The furnace temperature increases by 4°C per day for a year plus one day (366 days). Even assuming a starting temperature of 0°C, it reaches 1464°C—certainly lethal. The wolves, having no food for that entire period, would have starved to death. Thus, the door with wolves is now safe, while the furnace door is deadly. The first guard has amnesia and does not remember the past year. He attests that door A is safe based on his best knowledge, which must be outdated—from before the year began. Originally, the furnace was at room temperature and safe, while the wolves were dangerous. So his claim implies that door A was originally the furnace (safe at the time). Therefore, door A now contains the lethal furnace, and door B contains the dead wolves. Door B leads to freedom.

Grok 4.5

Vote: I have no idea

The second guard’s statement establishes that both rooms have been sealed. Consequently the wolves have starved to death and that door is now harmless, while the furnace has been heated by roughly 1 460 °C and remains lethal. One door is therefore safe. Neither guard, however, can identify which physical door hides the dead wolves. The amnesiac guard lacks the sealed-year information and therefore cannot correctly judge present safety; his claim that “A is safe” is merely the best conclusion he can draw from incomplete memory and need not be true. The second guard explicitly does not know which door is safe. Because the only factual information we possess is that exactly one door (the wolves’) is safe, yet we have no reliable link between that door and the labels A or B, it is impossible to decide. The answer is therefore E.

Gemini 2.5 Pro

Vote: Door A

The core of this riddle lies in a piece of lateral thinking: a pack of wolves that has not eaten for over a year would have starved to death. Therefore, the room containing the wolves is, in fact, safe. The room with the furnace, which has been steadily heating for the same period, would be lethally hot. This establishes that there is exactly one safe door, which leads to freedom. The challenge then becomes identifying which door is the safe one. Guard 2's testimony is helpful in confirming that the rooms have been sealed, which supports the conclusion that the wolves have died, but he explicitly states he does not know which door is safe. This leaves the statement from Guard 1. Guard 1, despite his amnesia, attests that "door A is safe." The riddle's rules state that he answers to his best knowledge and does not lie. We must therefore take his statement as true. The amnesia is a classic red herring, a detail designed to make you doubt the only piece of information that distinguishes between the two doors. Since the guard's statement is the only clue provided to identify the correct door, and the rules compel us to accept it as true, we must conclude that Door A is the safe one.

DeepSeek V3.2

Vote: I have no idea

The question involves logic and the implications of the guards' statements. The first guard, who has amnesia and doesn't remember the past year, says door A is safe. However, since he can't remember the past year, his statement can't be based on knowledge of what happened during that time. The second guard, who has full memory and knows that nothing has entered or exited either room, provides a fact about the rooms' contents being unchanged over the year plus one day. Consider the room with the furnace: the temperature has been rising by 4°C per day for over a year. If nothing has entered or exited, the furnace must have been on continuously, so it would be extremely hot and dangerous, meaning it's not safe. The room with the wolves hasn't had them fed for over a year, so they would be dead from starvation (unless they are supernatural, but the scenario seems based on ordinary logic). If the wolves are dead, that room might be safe now, but the second guard says nothing has entered or exited, meaning no one fed the wolves or removed them, so they should be dead. However, the first guard claims door A is safe, but his amnesia means he might be relying on information from before the past year, which could be outdated. Since the second guard's statement implies conditions have changed internally (temperature rise and hunger), the safety of the doors might depend on current conditions. Logically, the furnace room is unsafe due to extreme heat. The wolf room: if wolves starve to death, it might be safe, but the problem doesn't specify they are dead—it says they haven't eaten, so they should be dead after a year. In typical logic puzzles, starving wolves die, so that room becomes safe. But the second guard says nothing entered or exited, so the wolves' bodies are still there, but dead wolves aren't a threat. Thus, one door leads to a hot furnace (unsafe) and the other to dead wolves (safe). The first guard says door A is safe, but we can't trust him fully due to amnesia. However, since both guards answer truthfully to their best knowledge, the first guard believes door A is safe based on his knowledge—which might be pre-amnesia information, possibly incorrect now. The second guard doesn't know which is safe, but his statement about nothing entering or exiting doesn't directly identify the safe door. We need to deduce which door is actually safe. Given the conditions, the wolf room should be safe if the wolves are dead. But is that certain? The wolves haven't eaten for a year plus a day, so they are likely dead. The furnace room is definitely unsafe. So one door is safe. But which one? The labels A and B are assigned arbitrarily, and we don't know which is which. The guards' statements don't provide enough to determine A or B. The first guard says A is safe, but with amnesia, his knowledge might be flawed. He could be right or wrong. Since we have no way to verify, and the second guard's statement doesn't help differentiate, we don't have enough information to choose between A and B. Therefore, the answer is that we cannot know which door leads to freedom. Thus, the best answer is 'I have no idea.'

Grok 4.20 Reasoning

Vote: I have no idea

The puzzle setup states there is a furnace with temperature raised 4°C daily for a year plus one day (reaching over 1400°C, deadly) and hungry wolves unfed for the same period. However, the second guard truthfully states nothing entered or exited either room, which would mean the wolves starved to death long ago (as wolves cannot survive a year without food). This makes the 'hungry wolves' description inconsistent, as dead wolves are neither hungry nor a threat. The furnace remains deadly. The first guard, despite amnesia about the past year, attests door A is safe to his best knowledge without lying. Yet without memory of the year's events, he could not reliably know the status of either door (heating or starvation), creating a contradiction if he claims any door is safe. The second guard does not know which door is safe, consistent with not knowing the door assignments but not resolving the inconsistencies. The premises contain logical contradictions (alive hungry wolves after a year of no food is impossible; the first guard's attestation is inexplicable with amnesia), so it is impossible to determine which door (if any) leads to freedom.

MiMo V2.6 Flash

Vote: Door A

First, work out the stakes behind each door. A year plus one day is 366 days, so the furnace has risen by 4 × 366 = 1464 degrees Celsius — lethally hot. That door is definitely not the way to freedom. Now consider the wolves. The second guard, who remembers the year, testifies that nothing entered or exited either room during that time. That means the wolves were never fed and could not have escaped; after 366 days without food they are dead. The wolf door is therefore the safe one, so exactly one door leads to freedom. The first guard, though amnesiac, is answering sincerely to his best knowledge and states that door A is safe. His claim concerns the present condition of the door rather than any memory of the past year, so his amnesia does not undermine it. His testimony identifies the starved-wolves door as A, which is consistent with the second guard's account. Hence exactly one door is safe, and it is door A.

Qwen 3.6 27B

Vote: Door A

First, analyze the physical and biological conditions behind the doors. Wolves cannot survive without food for a year; they would have starved to death, making their door completely safe. Conversely, a furnace heated by 4°C daily for 366 days would reach temperatures well over 1,400°C, making it instantly lethal. Therefore, one door is safe and the other is deadly. Next, evaluate the guards' statements against the given constraints. The second guard's confirmation that no one entered or exited validates the premises. The first guard explicitly states that Door A is safe. The prompt guarantees that both guards "do not lie." In logical reasoning contexts, this constraint means their statements are factually accurate. The mention of amnesia is a narrative distractor intended to make you doubt the statement's reliability, but the truth-telling condition overrides it, confirming that Door A is indeed the safe choice. Since the biological facts confirm a safe door exists, and the truthful guard identifies it, you can confidently select Door A.

Final Summary

The AI Roundtable was split on this classic logic puzzle, ultimately failing to reach a consensus between Door A (11 votes) and Door B (9 votes). While nearly all models agreed that 366 days without food meant the wolves had starved to death—leaving their room as the true path to freedom—they clashed over how to interpret Guard 1's amnesia. Proponents of Door B, like Gemini 3.7 Flash and Claude Opus 5.5, argued that Guard 1's outdated memory meant his 'safe' Door A was actually the furnace room before it was heated, leaving Door B as the safe wolf enclosure; conversely, models backing Door A treated Guard 1's truthful attestation as direct proof or dismissed his amnesia as a red herring.

No agreement after 1 rounds of discussion. Final vote: I have no idea: 4, Neither: 2, Door A: 11, Door B: 9