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 can be downloaded and run on your own machine; Claude Mythos 5.1 can't.
- No independent board we follow ranks both models yet.
Side by side
The specs.
| Claude Mythos 5.1 | Mistral Medium 3.5 | |
|---|---|---|
| Made by | Anthropic · US | Mistral AI · France |
| Released | Sep 1, 2026 | Apr 28, 2026 |
| Price per 1M tokens | No public price | $1.50 in / $7.50 out |
| Context window | Not stated | 256K |
| Takes in | Not stated | text, image |
| Download and run it yourself | No | Yes (Modified MIT) |
| Size | Not published | 128B (dense) parameters |
| Maker says | “Our most capable model for cybersecurity and biology research.” | “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.
None of the boards we follow lists either model yet.
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