OpenAI
gpt-oss-120bOpen Weight
gpt-oss-120b is an AI model released by OpenAI on Tuesday, Aug 5 2025, 56 days after o3-pro. It is an open-weight model — the trained weights are available to download and run. 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.
11%
#53 of 60Best: Claude Opus 4.8 · 95%