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Mistral Codestral

Mistral Codestral is Mistral AI's first dedicated code generation model, trained on 80+ programming languages with a context window of 128K tokens and fill-in-the-middle (FIM) support for in-context code completion.

Tool Use
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'mistral/codestral',
  prompt: 'Why is the sky blue?'
})
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Frequently Asked Questions

  • What is fill-in-the-middle (FIM) and how does Mistral Codestral use it?

    FIM allows Mistral Codestral to complete code given both a prefix (code before the cursor) and a suffix (code after the cursor). Mistral Codestral uses this to insert completions inside partial functions or expressions, which is the dominant pattern in IDE plugins.

  • How many programming languages does Mistral Codestral support?

    Mistral Codestral was trained on over 80 programming languages. Benchmarked languages include Python, C++, Bash, Java, PHP, TypeScript, C#, SQL, Swift, and Fortran.

  • What is Mistral Codestral's context window?

    128K tokens. At launch this was over four times larger than the 4K to 16K windows typical of competing code models.

  • Can Mistral Codestral write unit tests?

    Yes. Test generation is an explicit use case in Mistral AI's documentation for Mistral Codestral alongside code completion and documentation authoring.

  • Is Mistral Codestral available as an open-weight model?

    Yes. Weights are available on HuggingFace under the Mistral AI Non-Production License (MNPL). Commercial API access is available through La Plateforme and AI Gateway.

  • How does Mistral Codestral integrate with IDEs?

    Mistral Codestral integrates with Continue.dev and Tabnine plugins for VS Code and JetBrains, using the FIM API for in-editor completions.

  • How is Mistral Codestral different from Devstral?

    Mistral Codestral is a code generation and completion model focused on individual file-level tasks. Devstral is an agentic model designed to navigate entire codebases, resolve GitHub issues, and orchestrate multi-file changes autonomously.