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Free Mistral API: the code one

Mistral's free experimentation tier stands out for code: Codestral is a code-specialized model with fill-in-the-middle support, which makes it a genuinely useful free option for code completion and generation, not just chat. Mistral is also a European provider, which some teams prefer for data-residency reasons. Get a key free at console.mistral.ai/api-keys and call the OpenAI-compatible endpoint at https://api.mistral.ai/v1. Pool it with other tiers via freellmpool so a rate limit doesn't interrupt a coding session.

What Mistral's free tier is good for

Two things stand out. First, code: codestral-latest is tuned for programming and supports fill-in-the-middle (completing code given a prefix and suffix), which most general chat models don't do natively. Second, European hosting, which matters to teams with EU data preferences. For general chat it's solid but not the fastest free tier — pair it with Groq or Cerebras for latency-sensitive work.

Free models

• codestral-latest — code generation and completion (fill-in-the-middle).
• mistral-small-latest — capable, efficient general model.
• open-mistral-nemo — small open model, good for cheap drafts.

Get a key and call it

curl https://api.mistral.ai/v1/chat/completions \
  -H "Authorization: Bearer $MISTRAL_API_KEY" -H "Content-Type: application/json" \
  -d '{"model":"codestral-latest","messages":[{"role":"user","content":"Write a Python LRU cache"}]}'

Limits and gotchas

• The free tier is for experimentation and is rate-limited per minute and per month; verify current numbers in the console.
• Codestral has its own dedicated completion endpoint for true fill-in-the-middle; the chat endpoint shown above is fine for instruct-style code generation.
• Some newer Mistral models are paid-only — the free tier centers on Small, Nemo, and Codestral.

Pool Mistral with other free tiers

A nice setup for developers: Codestral via Mistral for code tasks, and a fast general tier for everything else, all behind one endpoint. freellmpool lets you pin Codestral when you want it and pool the rest:

pip install freellmpool
export MISTRAL_API_KEY=...               # plus other free keys
freellmpool ask -m codestral-latest "Refactor this function" < code.py
freellmpool ask "..."                    # pool + fail over for general tasks

See also running coding agents on free models and using multiple free LLM APIs together.

FAQ

Is the Mistral API free?

Yes, Mistral has a free experimentation tier. Create a key at console.mistral.ai/api-keys and call the OpenAI-compatible endpoint at api.mistral.ai/v1. It's rate-limited; verify current limits.

Is Codestral free, and what makes it useful?

Codestral is available on the free tier via codestral-latest. It's tuned for code and supports fill-in-the-middle completion, which makes it a strong free choice for editor-style code tasks.

Why pick Mistral over other free tiers?

For code (Codestral) and for European data residency. For pure speed, Groq or Cerebras are better — which is why pooling them with freellmpool gives you the best of each.

Part of freellmpool (MIT, open source). Limits and model availability change — check Mistral's docs. Updated 2026-06-03.