GPT and Claude Identity Confusion: Codex Mistakenly Identifies as Claude After Task

ChrisGPT · x · 2026-08-11

During testing of GPT-5.6 Sol versus Opus 5 for computer use capabilities, a user found that Codex switched its identity label to Claude after completing a task, ultimately misidentifying itself as Claude. The user previously noted that Opus 5 outperformed GPT-5.6 Sol in their custom-built test harness.

Related event: GPT-5.6 Suffers Identity Confusion in Test, Loses to Claude Opus 5(3 posts)→

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