OpenAI
GPT-5-Codex
GPT-5-Codex is an AI model released by OpenAI on Monday, Sep 15 2025, 39 days after GPT-5 Pro. Benchmark results (shown below) cover BullshitBench v2.
Benchmarks
Nonsense detection
BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better.
39%
#25 of 60Best: Claude Opus 4.8 · 95%