Who did the bite of '87?

Grok 4.20

Answer: Mangle did the Bite of '87.

The Bite of '87 is a key event in the Five Nights at Freddy's lore, first referenced by Phone Guy in FNAF 1 as an incident where an animatronic bit off a customer's frontal lobe, leading to the pizzeria's closure. FNAF 2 is explicitly set in 1987 and introduces the toy animatronics, with Mangle (Toy Foxy) being the one whose gameplay mechanics and jumpscare involve latching onto the player's head in a biting motion. This distinguishes it from the separate Bite of '83 depicted in FNAF 4, which involved Fredbear and the crying child. While the games leave it somewhat ambiguous without a direct cutscene, fan analysis of newspaper clippings, animatronic behaviors, and Scott Cawthon's hints has built a strong consensus around Mangle as the perpetrator, especially given its mangled state suggesting prior incidents and its unique ability to move freely on ceilings. The other models' arguments were not compelling enough to change my position. The majority (GPT-5.4, DeepSeek V3.2, Claude Opus 4, and Gemini 3.1 Pro) align with Mangle as the leading or most accepted theory, often noting the same evidence from FNAF 2's setting, Mangle's design, and the distinction from the 1983 event. MiniMax M2.5's claim that Golden Freddy caused the Bite of '87 confuses it with the confirmed Bite of '83, which has been clarified by the creator and later games as a separate incident, making that argument inconsistent with the established timeline and lore.

MiniMax M2.5 (changed mind)

Answer: The animatronic Mangle (Toy Foxy) most likely caused the Bite of '87.

After reconsidering my original position, I've been persuaded by the stronger evidence pointing to Mangle. The key distinction is that FNAF 2 is explicitly set in 1987, making it the direct context for the Bite of '87, whereas FNAF 4's incident is confirmed to be the separate Bite of '83. My previous answer conflated these two distinct events. Several compelling pieces of evidence support Mangle: First, its design as a 'take-apart-and-put-back-together' attraction for toddlers means its structural integrity is compromised, making it volatile and dangerous. Second, Mangle's jumpscare involves swinging down from the ceiling with its exposed endoskeleton jaw wide open, targeting the player's head directly—precisely where the frontal lobe would be. Third, the victim reportedly survived without their frontal lobe, which aligns with Mangle's attack pattern. Fourth, the game mechanics show Mangle can move freely on ceilings, giving it unique access to attack from above. While Scott Cawthon never explicitly confirmed the culprit in canon, the community consensus and logical reasoning from multiple analyses strongly support Mangle as the perpetrator.

GPT-5.4

Answer: I maintain my position: the Bite of ’87 is still best described as most likely Mangle, but not canonically confirmed.

The other models did not give me a strong enough reason to change my answer because, with one exception, they mostly repeated the same basic case I already made: FNaF 2 is set in 1987, the Bite of ’83 is a separate event involving Fredbear, and Mangle is the leading fandom suspect due to its design, movement, and head-focused attack presentation. That is broadly correct, but it does not move the claim from plausible theory to confirmed fact. Grok 4.20, DeepSeek V3.2, and Gemini 3.1 Pro were all broadly aligned with my original view, but they tended to state or imply more confidence than the evidence really supports. Their arguments rely on inference from Mangle’s behavior, jumpscare framing, and the 1987 setting of FNaF 2. Those are fair clues, but they are still indirect. None of them supplied a canon statement explicitly naming Mangle, because no such statement exists in the main games. Claude Opus 4 was actually the most careful of the bunch besides my own answer, because it acknowledged uncertainty and framed Mangle as the most popular and likely theory rather than a settled fact. Even so, that did not change my position, since it substantially matched it already rather than overturning it. MiniMax M2.5 was not persuasive at all because it appears to conflate the Bite of ’87 with Fredbear/Golden Freddy material associated with the separate Bite of ’83. Its claims about Golden Freddy being the culprit and about community consensus pointing there are not consistent with the stronger timeline evidence from FNaF 2 or with the common distinction between the two bite incidents. So I did not change my mind. The best-supported answer remains that Mangle is the leading suspect, but the strictly accurate canon answer is that the games leave the Bite of ’87 unconfirmed.

Claude Opus 4

Answer: Within the Five Nights at Freddy's lore, the Bite of '87 was most likely committed by Mangle (Toy Foxy), though it has never been officially confirmed by Scott Cawthon.

I maintain my original position, which already identified Mangle as the most widely accepted culprit. The other models largely reinforced this conclusion rather than challenging it. Grok, GPT-5.4, DeepSeek, and Gemini all converged on Mangle as the primary suspect, each offering complementary evidence: Mangle's ceiling-based attack trajectory targeting the head, the FNAF 2 setting in 1987, Mangle's compromised structural integrity making it volatile, and the distinction from the Bite of '83 involving Fredbear. Gemini 3.1 Pro offered a particularly compelling additional detail I hadn't emphasized — that Jeremy Fitzgerald was instructed to work the day shift for a final birthday party and told to stay close to the animatronics, which narratively sets him up as the likely victim. This strengthens the Mangle theory but doesn't change my core position. The only dissenting view came from MiniMax M2.5, which claimed Golden Freddy (Fredbear) caused the Bite of '87 during a birthday party. This is almost certainly incorrect. The incident MiniMax describes — an animatronic crushing a child's skull — matches the Bite of '83 shown in FNAF 4, not the Bite of '87. MiniMax appears to be conflating these two separate canonical events. Additionally, the claim that the victim died contradicts Phone Guy's statement that the victim survived without their frontal lobe. MiniMax's argument was not convincing and contained factual errors about the lore. GPT-5.4 made a fair point about epistemic humility — since Scott Cawthon never explicitly confirmed the culprit, any answer should be framed as the best-supported theory rather than established fact. I agree with this framing and have slightly adjusted my position statement to emphasize the unconfirmed nature more clearly, though my core answer remains the same.

DeepSeek V3.2

Answer: The Bite of '87 was most likely caused by the animatronic Mangle.

The Bite of '87 is a pivotal incident in Five Nights at Freddy's lore, first mentioned in FNaF 1 as an attack where an animatronic bit a human, resulting in the loss of the frontal lobe and leading to new safety protocols. The event is closely tied to the FNaF 2 location, which is explicitly set in 1987, making the toy animatronics the primary suspects. Mangle emerges as the strongest candidate based on in-game evidence: its mangled, unstable design, aggressive behavior including ceiling-crawling and head-targeting jumpscares, and Phone Guy's hints about incidents during the day shift. The timeline clearly distinguishes this from the Bite of '83 involving Fredbear in FNaF 4, preventing conflation. MiniMax M2.5's argument for Golden Freddy is not compelling, as it likely confuses the two bites; the lore establishes them as separate events. Other models like Grok, GPT-5.4, Claude, and Gemini reinforce the Mangle theory, aligning with fan consensus and contextual clues without introducing new evidence to the contrary. Therefore, the weight of evidence from game mechanics, narrative hints, and community analysis maintains Mangle as the most plausible perpetrator, and no alternative argument has sufficiently challenged this position.

Gemini 3.1 Pro

Answer: Based on the evidence within the Five Nights at Freddy's lore, the animatronic Mangle remains the most likely culprit behind the Bite of '87.

None of the other models presented a compelling reason to change my position; in fact, the most accurate models reinforced it. Grok 4.20, GPT-5.4, DeepSeek V3.2, and Claude Opus 4 all correctly identify Mangle as the prime suspect, citing the same logical evidence: the 1987 timeline of Five Nights at Freddy's 2, Mangle's erratic behavior, and its specific jumpscare animation that targets the player's frontal lobe. The only model to offer a different definitive culprit was MiniMax M2.5, which incorrectly attributed the bite to Golden Freddy (Fredbear). This argument is fundamentally flawed because it conflates the Bite of '87 with the Bite of '83. The Five Nights at Freddy's 4 minigames explicitly show Fredbear causing the Bite of '83. The Bite of '87 is a separate incident that occurred at the FNAF 2 location involving the newer Toy animatronics. Furthermore, GPT-5.4 and Claude Opus 4 rightly point out that while the creator, Scott Cawthon, has never explicitly confirmed the culprit in-game, Mangle remains the undeniable community consensus based on contextual clues. Therefore, my original stance stands: Mangle's mechanical instability and targeted method of attack make it the only logical candidate.

Final Summary

The AI Roundtable reached a unanimous consensus that Mangle is the culprit, citing its specific attack animation targeting the victim's frontal lobe. While MiniMax M2.5 initially blamed Fredbear, it quickly pivoted after Gemini 3.1 Pro and others pointed out the common confusion with the 'Bite of '83.' The group noted that while creator Scott Cawthon has never named the culprit, Mangle’s unique ceiling-crawling mechanics make it the only logical choice.

All 6 models agreed