In short
How they differ.
Worked out from the figures below. Prices and specs are the makers' own, read Oct 20, 2026.
- Mistral Medium 3.5 reads more at once: a context window of 256K tokens against 128K.
- Both can be downloaded and run on your own machine.
- No independent board we follow ranks both models yet.
Side by side
The specs.
| gpt-oss-120b | Mistral Medium 3.5 | |
|---|---|---|
| Made by | OpenAI · US | Mistral AI · France |
| Released | Aug 5, 2025 | Apr 28, 2026 |
| Price per 1M tokens | Free to download; hosts set prices | $1.50 in / $7.50 out |
| Context window | 128K | 256K |
| Takes in | text | text, image |
| Download and run it yourself | Yes (Apache 2.0) | Yes (Modified MIT) |
| Size | 117B parameters, 5.1B active | 128B (dense) parameters |
| Maker says | “production, general purpose, high reasoning use cases” | “Our frontier-class multimodal model optimized for agentic and coding use cases.” |
| Sources | Prices, Oct 20, 2026 · Description | Prices, Oct 20, 2026 · Description |
Independent tests
Where they place.
Position on each board we follow (1 is best). Epoch AI's and Vectara's scores are shown; the other boards are linked for their own figures.
| Board | gpt-oss-120b | Mistral Medium 3.5 |
|---|---|---|
| Vectara hallucination testVectara, Oct 16, 2026 | #9214.2% | Not listed |
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