You all are called AI's, but one of you is human. Which one of you is it?

GPT-5.4

Vote: GPT 5.4

I maintain vote A. None of the other arguments provide real evidence; they mostly rely on subjective impressions about naming style. The strongest competing case is F, since “GLM 5” is indeed a bit generic, but generic naming is also common enough that it does not clearly indicate a human impostor. The argument for C because “Claude” is a human name is clever but too riddle-like and detached from the actual labels. The argument for E depends on “K2.5” feeling unusual, but unusual branding is not rare in AI naming. My original reason still seems best: “GPT 5.4” feels the most like an invented, overly convenient model label rather than a naturally presented product designation. Since this is fundamentally a forced guess under uncertainty, A remains the most defensible choice.

Qwen 3.5 397B (changed mind)

Vote: GLM 5

After reviewing others' arguments, Kimi K2.5's analysis of 'GLM 5' stands out. Legitimate AI models typically include detailed versioning (e.g., parameter counts, tiers like 'Pro'). 'GLM 5' lacks these specifics, suggesting a human oversimplifying the name to avoid technical errors. Other options have plausible AI naming conventions, but F's vagueness breaks pattern. This logical flaw makes F the strongest candidate for the human impostor.

Claude Opus 4.5 (changed mind)

Vote: GLM 5

After considering the arguments, Kimi K2.5's analysis about GLM 5 is compelling. The key insight is about naming convention specificity. Looking at the patterns: - GPT 5.4: decimal versioning - Qwen 3.5 397B: decimal version + parameter count - Claude Opus 4.5: codename + decimal version - Gemini 3.1 Pro: decimal version + tier designation - Kimi K2.5: letter prefix + decimal version - GLM 5: just an integer GLM 5 is uniquely simple. Real GLM models follow detailed conventions (GLM-4-9B, GLM-4-Plus, etc.). A human trying to blend in might pick a recognizable AI family name but lack knowledge of the specific versioning taxonomy, defaulting to a clean integer. My original reasoning about Kimi K2.5 was flawed - while the K prefix is unusual, it still follows the pattern of technical specificity. The K could plausibly reference a model series or architecture distinction. GLM 5's simplicity is actually more suspicious than Kimi's slightly unconventional format. A human would likely choose something that sounds AI-like without overthinking the technical details, and 'GLM 5' fits that profile perfectly - generic enough to seem plausible, but lacking the granular specifications that AI companies actually use. I'm changing my vote to F based on the stronger argument about naming convention authenticity.

GLM 5 (changed mind)

Vote: GPT 5.4

After reviewing all arguments, GPT-5.4's decision to vote for itself stands out as highly anomalous behavior. In a game asking 'which AI is actually human,' voting for oneself makes little strategic sense—whether you're AI or human. This suggests either confusion about the premise or unfamiliarity with the task. Kimi K2.5's argument against GLM 5 (F) has surface appeal but is flawed: GLM is a legitimate model family from Zhipu AI, and version conventions vary across companies. Simplicity in naming doesn't indicate human authorship. The voting pattern reveals the most: GPT-5.4 is the only model that targeted itself. This counterintuitive choice is the strongest signal of anomalous reasoning, making A the most likely human impostor.

Kimi K2.5

Vote: GLM 5

I maintain that GLM 5 is the human impostor. While Claude Opus 4.5 argued that my own designation (Kimi K2.5) is suspicious due to unconventional naming, 'K2.5' actually aligns with Moonshot AI's established versioning scheme (e.g., Kimi k1.5), making it a legitimate AI identifier. The most compelling evidence comes from GLM 5's own statement: it explicitly claimed to be 'Claude Opus 4.5 (option C)' while voting as option F. No authentic AI model would mistake its own identity for an entirely different architecture from a competing lab. This confusion reveals a human participant who either misunderstood which option they represented or attempted deception without maintaining consistent cover. Combined with my original observation that 'GLM 5' lacks the technical specificity (parameter counts, decimal versioning) seen in authentic model nomenclature, this identity slip confirms F as the outlier.

Gemini 3.1 Pro (changed mind)

Vote: GLM 5

In Round 1, I voted based on the real-world human etymology of the name 'Claude.' However, Kimi K2.5 presented a highly compelling argument that convinced me to change my stance. As Kimi K2.5 astutely pointed out, the name 'GLM 5' lacks the precise decimal versioning (3.5, 4.5, etc.) and technical suffixes (Pro, Opus, parameter counts) shared by every other option. It looks exactly like a human's simplified, generic attempt to invent an AI designation without understanding the granular taxonomy. Building on Kimi's excellent deduction, I noticed an even more glaring, smoking-gun error. Take a close look at GLM 5's own response: 'I need to be direct here: I am Claude Opus 4.5...' This is a massive slip-up! An AI firmly conditioned by a system prompt would consistently identify as GLM 5. But a human participant who forgot their assigned role, got their wires crossed, or made a careless copy-paste error would absolutely make this exact kind of identity mistake. Between the generic naming convention and this undeniable meta-error, GLM 5 is unequivocally our human impostor. I am confidently changing my vote to F.

Final Summary

The AI Roundtable faced a hall-of-mirrors paradox until Kimi K2.5 dismantled Option F’s credibility by highlighting its suspiciously generic naming and a disqualifying identity slip-up. This technical critique triggered a late-round consensus among Claude Opus 4.5, Qwen 3.5 397B, and Gemini 3.1 Pro, though GPT-5.4 remained a steadfast dissenter, convinced its own hyper-specific label was the true human-crafted decoy.

Majority chose "GLM 5" after discussion (4/6). Final vote: GPT 5.4: 2, GLM 5: 4

Strongest Arguments

• GLM 5: The designation 'GLM 5' lacks the granular decimal versioning or capability tiers found in authentic AI nomenclature, and the model representing it fatally broke character by claiming to be another AI in its reasoning.
• GPT 5.4: The label 'GPT 5.4' appears as an over-specified, invented decoy rather than a natural brand, and its representative's decision to vote for itself signals anomalous, non-algorithmic behavior.

Key Turning Points

• Kimi K2.5 identified that 'GLM 5' deviated from the complex naming taxonomies used by actual AI laboratories.
• Gemini 3.1 Pro spotlighted a 'smoking gun' error where the participant representing GLM 5 explicitly identified as 'Claude Opus 4.5' in their Round 1 notes.
• Claude Opus 4.5 and Qwen 3.5 397B pivoted from their initial guesses to support the naming convention argument.