gpt-oss-20b vs o3
OpenAI gpt-oss-20b | OpenAI o3 | |
|---|---|---|
| Overview | ||
| Company | OpenAI | OpenAI |
| Release date | Aug 5 2025 | Apr 16 2025 |
| Access | Open Weight | Proprietary |
| 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. | — | 26% |
| Timeline | ||
| Release gap | o3 shipped 111 days before gpt-oss-20b | |
Which is better: gpt-oss-20b or o3?
gpt-oss-20b and o3 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. o3 shipped 111 days before gpt-oss-20b, so benchmark comparisons should account for the intervening progress.
gpt-oss-20b is open weight, while o3 is proprietary.
Direct benchmark comparisons are unavailable — gpt-oss-20b and o3 don't publish scores on any of the same benchmarks.
Frequently asked questions
gpt-oss-20b was released by OpenAI on Aug 5 2025.
o3 was released by OpenAI on Apr 16 2025.
gpt-oss-20b is an open weight model released by OpenAI. o3 is a proprietary model released by OpenAI.