Gemini 2.5 Pro vs gpt-oss-20b
Google Gemini 2.5 Pro | OpenAI gpt-oss-20b | |
|---|---|---|
| Overview | ||
| Company | OpenAI | |
| Release date | Mar 25 2025 | Aug 5 2025 |
| Access | Proprietary | Open Weight |
| 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. | 20% | — |
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 59.6% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 86.4% | — |
Multimodal MMMUTests the AI on understanding images and text together across many college subjects. Higher is better. | 68% | — |
| Timeline | ||
| Release gap | Gemini 2.5 Pro shipped 133 days before gpt-oss-20b | |
Which is better: Gemini 2.5 Pro or gpt-oss-20b?
Gemini 2.5 Pro and gpt-oss-20b don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Gemini 2.5 Pro shipped 133 days before gpt-oss-20b, so benchmark comparisons should account for the intervening progress.
Gemini 2.5 Pro is proprietary, while gpt-oss-20b is open weight.
Direct benchmark comparisons are unavailable — Gemini 2.5 Pro and gpt-oss-20b don't publish scores on any of the same benchmarks.
Frequently asked questions
Gemini 2.5 Pro was released by Google on Mar 25 2025.
gpt-oss-20b was released by OpenAI on Aug 5 2025.
Gemini 2.5 Pro is a proprietary model released by Google. gpt-oss-20b is an open weight model released by OpenAI.
Other comparisons
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