Mistral Medium 3.5 vs gpt-oss-20b
Mistral Mistral Medium 3.5 | OpenAI gpt-oss-20b | |
|---|---|---|
| Overview | ||
| Company | Mistral | OpenAI |
| Release date | Apr 29 2026 | Aug 5 2025 |
| Access | Open Weight | Open Weight |
| Specifications | ||
Parameters | 128B | — |
Context window | 256k | — |
| Benchmarks | ||
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. | 77.6% | — |
| Timeline | ||
| Release gap | gpt-oss-20b shipped 267 days before Mistral Medium 3.5 | |
Which is better: Mistral Medium 3.5 or gpt-oss-20b?
Mistral Medium 3.5 and gpt-oss-20b don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. gpt-oss-20b shipped 267 days before Mistral Medium 3.5, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
Direct benchmark comparisons are unavailable — Mistral Medium 3.5 and gpt-oss-20b don't publish scores on any of the same benchmarks.
Frequently asked questions
Mistral Medium 3.5 was released by Mistral on Apr 29 2026.
gpt-oss-20b was released by OpenAI on Aug 5 2025.
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