Mistral Medium 3.5
Mistral AI
Key facts · verified Oct 30, 2026
Mistral Medium 3.5 is a Mistral AI model released on 28 Apr 2026. Its API price is $1.50 per million input tokens and $7.50 per million output tokens. Its context window is 256k tokens. It ranks #122 on LMArena's text leaderboard (Elo 1426, read 1 Nov 2026). Source: mistral.ai.
Mistral Medium 3.5 is a dense 128-billion-parameter model from Mistral AI, released on April 28, 2026, that combines chat, reasoning and code in one model. Mistral states it replaces Mistral Medium 3.1 and Magistral in Le Chat, and Devstral 2 in Vibe. The weights are published under a Modified MIT licence, and Mistral lists API pricing of $1.50 per million input tokens and $7.50 per million output tokens.
Pricing & specs checkedSource: vendor documentation · checked Oct 30, 2026LMArena: 1426 Elo (rank 122) · source · retrieved Nov 1, 2026
Key Features
Agentic Coding Configurable Reasoning Vision Function Calling Structured Output OCR
Full Specifications
$1.50 / $7.50 per million tokens | |
|---|---|
| Identity | |
| Developer | Mistral AI |
| Released | Apr 2026 |
| Status | GA |
| Licence | Open weights (Modified MIT) |
| Self-hostable | Yes (open weights) |
| Cost | |
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $3.000 / 1M tokens |
| Input price | $1.500 / 1M tokens |
| Output price | $7.500 / 1M tokens |
| Cached input | Not published |
| Batch discount | 50% off (Batch API) |
| Free tier | Free tier via La Plateforme rate limits |
| Capacity | |
| Context window | 256k tokens |
| Max output | Not published |
| Long-context surcharge | Not published |
| Capability | |
| Vision in | Yes |
| Audio in | No |
| Function calling | Yes |
| Structured output | Yes |
| Extended reasoning | Yes (configurable reasoning effort) |
| Web search | No |
| Code execution | No |
| Access | |
| API | Yes |
| Chat app | Yes |
| Cloud marketplaces | Not published |
| Fine-tuning | Not published |
| Measured quality | |
| LMArena Elo | 1426 (checked Nov 2026) |
| LMArena rank | Rank 122 |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 475 |