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Free Mistral API: the experimentation tier

Mistral's free mode is useful for bounded experimentation, with included monthly usage shown in each account's Limits page. Model access and lifecycle status change, so this guide uses mistral-small-latest as the conservative current example rather than promising that an undocumented code alias is recurring-free. Get a key 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

Use it for evaluation and general chat within the included account allowance. Mistral publishes EU/GDPR-oriented privacy material, but freellmpool's catalog does not pin a serving region, so do not infer data residency from the provider's headquarters. Pair it with another provider when availability or latency matters.

Conservative current model

Mistral's current model catalog supports this conservative example:

• mistral-small-latest — capable, efficient general model.

Invalid and retired spellings are disabled. Undocumented code/vibe aliases and routes explicitly marked pin-only are excluded from automatic capacity. zai-glm-5-2 and labs-leanstral-1-5 are disabled exact pins pending credentialed canaries.

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":"mistral-small-latest","messages":[{"role":"user","content":"Write a Python LRU cache"}]}'

Limits and gotchas

• The free tier is for experimentation. Included monthly usage and rate limits are account- and model-specific; verify them on the current usage-limits page.
• Labs models are experimental and do not provide the same lifecycle guarantees as production models.
• Mistral's lifecycle policy says retired model IDs return 404; prefer documented current aliases.

Pool Mistral with other free tiers

Use Mistral for bounded experiments and a recurring tier for routine traffic, all behind one endpoint. freellmpool lets you pin the conservative Mistral route when you want it and pool the rest:

pip install freellmpool
export MISTRAL_API_KEY=...               # plus other free keys
freellmpool ask -m mistral/mistral-small-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.

Can I rely on a Codestral alias as recurring-free capacity?

No. Even a documented, enabled alias has account-specific free-mode limits and can change lifecycle status. Undocumented code aliases are excluded from automatic routing; check Mistral's current model list and your Limits page before depending on one.

Why pick Mistral over other free tiers?

For bounded access to Mistral's own models through its direct API. Pool it with other providers for failover, and use Mistral's privacy controls rather than assuming a catalog-pinned region.

Part of freellmpool (MIT, open source). Limits and model availability change — check Mistral's docs. Updated 2026-08-29.