Mistral Medium 3.5
Mistral Medium 3.5 is a reasoning model from Mistral released on Apr 29, 2026. It reads text, images and files and writes text, with a 262K token context window and up to 210K tokens per reply.
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It costs $1.50 per million input tokens and $7.50 per million output tokens.
It supports tool calling and structured JSON output, and its weights are open, so you can host it yourself.
18 providers serve it, including Scaleway, Vercel AI Gateway and DevPass (LLM Gateway).
On the Artificial Analysis Intelligence Index it scores 14.2, which places it at number 32 among the 43 models I track with independent scores.
- Modalities
- In / out price
- $1.50 / $7.50 per 1M
- Context
- 262K
- Max output
- 210K
- Released
- Apr 29, 2026
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Mistral Medium 3.5 pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $1.50 / 1M tokens | |
|---|---|---|
| Output | $7.50 / 1M tokens |
Mistral Medium 3.5 providers
18 providers serve it, including Scaleway, Vercel AI Gateway and DevPass (LLM Gateway). Each host sets its own price and limits, so the cheapest one is not always the one with the longest context.
| Provider | Input /M | Output /M | Cache read /M | Context | Max output |
|---|---|---|---|---|---|
| Mistral First party | $1.50 | $7.50 | $0.15 | 262K | 262K |
| Scaleway | $1.50 | $7.50 | – | 256K | 16K |
| Vercel AI Gateway | $1.50 | $7.50 | $0.15 | 262K | 256K |
| DevPass (LLM Gateway) | $1.50 | $7.50 | – | 262K | 262K |
| Eden AI | $1.50 | $7.50 | $0.15 | 262K | 210K |
| Kilo Gateway | $1.50 | $7.50 | – | 262K | 210K |
| LLM Gateway | $1.50 | $7.50 | – | 262K | 262K |
| NanoGPT | $1.50 | $7.50 | $0.75 | 256K | 33K |
| Pioneer | $1.50 | $7.50 | $1.50 | 256K | 131K |
| Tempr Gateway | $1.50 | $7.50 | – | 262K | 262K |
| Cortecs | $1.53 | $7.84 | $0.154 | 256K | 256K |
| LowRouter | $1.57 | $7.84 | $0.1569 | 262K | 262K |
Showing 12 of 18 providers: the lab first, then the major clouds, then the cheapest resellers.
What Mistral Medium 3.5 costs per month
Pick a workload close to yours or type your own volumes.
Independent benchmarks
Measured by third parties, not reported by Mistral. Each links to its source and shows the date I checked it.
A composite of 10 independent evaluations (agents 30%, coding 20%, scientific reasoning 20%, general 30%), run by Artificial Analysis on each model, version 4.3.2.
Artificial Analysis, checked Oct 10, 2026
Human preference: people compare two anonymous answers and pick the better one. Ratings from the Text Arena overall board, style control on.
Arena (formerly LMArena), checked Oct 10, 2026
Median output tokens per second measured by Artificial Analysis on the provider API, for the same model setting as its index score.
Artificial Analysis, checked Oct 10, 2026
Benchmarks Mistral reports (2)
- swe-bench-verified (SWE-Bench Verified (harness and attempts not stated))77.6%
- tau3-bench-telecom (τ³-Telecom)91.4
Labs pick their own settings and harnesses, so compare these only within one lab.
Supported request parameters
What you can set when you call Mistral Medium 3.5 through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Reasoning
reasoning - Temperature
temperature
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Mistral Medium 3.5 questions
How much does the Mistral Medium 3.5 API cost?
$1.50 per million input tokens and $7.50 per million output tokens. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of Mistral Medium 3.5?
262,144 tokens of input, and it can write up to 209,715 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Which providers serve Mistral Medium 3.5?
18 providers serve it, including Scaleway, Vercel AI Gateway and DevPass (LLM Gateway). Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does Mistral Medium 3.5 support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is Mistral Medium 3.5 open source?
Its weights are published, so you can run it on your own hardware or a cloud of your choice. Read the license before commercial use.
When was Mistral Medium 3.5 released?
Apr 29, 2026.
How good is Mistral Medium 3.5 compared with other models?
It scores 14.2 on the Artificial Analysis Intelligence Index and 1426 on the Arena text leaderboard. Benchmarks are a shortlist, not a verdict: test the top two or three candidates on your own tasks before you commit.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. Independent scores from my hand checked rankings, sources linked above. The summary is written from these facts.
Building on Mistral Medium 3.5?
I test your real tasks on it and the two closest alternatives, then ship the agent on whichever wins on cost and accuracy.
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