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Mistral Medium 3.5 AI features, pricing and GDPR (October 2026)

Multimodal model from Paris-based Mistral AI for agents and coding, via API and with open weights.

AI modelLLMsMultimodal modelsFrontier modelsGeneral purpose
Usage-based

from $1.50 usage-based

Pricing details

$1.50 per million input tokens and $7.50 per million output tokens. Batch is 50 percent cheaper. Weights under a modified MIT license.

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What is Mistral Medium 3.5?

Mistral Medium 3.5 is a multimodal model from the French developer Mistral AI, optimized for agentic and coding use cases and offered both through Mistral's API and as open weights under a modified MIT license.

Medium 3.5 was released on April 28, 2026 as version 26.04 with the API name mistral-medium-3-5. It processes text and images with a context window of 256,000 tokens and supports structured outputs, function calling, document question answering, batching and the agents and conversations endpoints. Mistral lists it among its premier models next to Mistral Large 3, and its weights are published under a modified MIT license.

Mistral Medium 3.5 AI features and use cases

  • Reads documents and imagesDocument question answering and image input let the model work with forms, scans and charts. Back-office teams extract information without a separate OCR step.
  • Runs coding and agent tasksFunction calling and the agents API support multi-step automation. Development teams build agents on a European provider.
  • Moves between API and self-hostingOpen weights allow the same model to run on company infrastructure later. IT teams can start in the cloud and keep the option to host it themselves.

What sets Mistral Medium 3.5 apart

  • European provider with EU hosting by default for API use.
  • Available as open weights under a modified MIT license in addition to the paid API.

Where Mistral Medium 3.5 is strongest

France Available internationally

Mistral AI is registered in Paris, and API data is hosted in the EU by default.

Questions to ask before you buy Mistral Medium 3.5

Read the modified MIT license terms before self-hosting, since they differ from plain MIT. Some API features can temporarily transfer data outside the EU to listed subprocessors. Estimate token volumes, as billing is per token.

Using Mistral Medium 3.5 in the EU: GDPR and AI Act

  • Data locationMultiple regions, EU region available (according to the vendor). Hosting regions: EU, United States.
  • Data processing agreementPublic, read it here (opens in a new tab).
  • EU AI ActCheck whether the AI prepares decisions about people. If not, the high-risk rules usually do not apply. The high-risk obligations apply from December 2, 2027 (Digital Omnibus).
General information with sources, not legal advice.

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Questions about Mistral Medium 3.5

What does Mistral Medium 3.5 cost via API?

$1.50 per million input tokens and $7.50 per million output tokens; batch processing halves the price.

Can I run it on my own servers?

Yes. Mistral publishes the weights under a modified MIT license.

Where is API data stored?

In the EU by default. Data is hosted in the US only if you explicitly use the US endpoint.

Mistral Medium 3.5 update historyno updates yet

No changes recorded for Mistral Medium 3.5 yet.

Changes the vendor made and confirmed user reports, each checked against the vendor's own pages. We review every tool monthly.

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