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Free AI API Keys & Official Free Tiers by Developer

Official free API tiers and one-time trial credits offered directly by LLM model developers (Google, Mistral, Anthropic and others) — entered by hand from each developer's own documentation, with a source link and a check date on every entry. Nothing here has been tested with a real API call, and third-party gateways or resellers (OpenRouter, Together, etc.) are out of scope for this page.

How this page is built. Every entry below is read and entered by a person from the developer's own pricing or docs pages — nothing is scraped, inferred, or copied from a third-party list. Each entry shows the date someone last checked it, and its “Full details” page links the source(s); an entry not re-checked in over 90 days is flagged so you can confirm it yourself before relying on it. For some developers we only link to their official page instead of summarizing it — see “Other developers” below.

Anthropic — Claude API new-user credits

One-time trial credits

Anthropic's pricing FAQ answers "Are there free tiers or trials?" with a small amount of free credits for new users to test the API.

Checked 2026-10-13.

Full details →

Google — Gemini API free tier (Google AI Studio)

Ongoing free tier

The Gemini API has a Free tier that offers free input and output tokens on a subset of models, with limited access to certain models and rate limits that are not guaranteed.

Checked 2026-10-13.

Full details →

Mistral — Mistral Studio Free mode

Ongoing free tier

Mistral Studio enables API access in Free mode by default, with no credit card required; usage and rate limits apply.

Checked 2026-10-13.

Full details →

Other developers

We don't summarize these developers' free-tier or trial terms here. Check their official pages directly.

Free AI API key FAQ

Is there a free AI API key with unlimited usage?

No. Every official free tier or trial credit listed on this page has limits — a rate limit, a usage cap, or a one-time credit of limited size — and this site does not list any key with unlimited usage. Limits change without notice, so confirm the current terms on the developer's own official page.

Where can I get free API keys for AI models?

Directly from a model developer that offers a public free tier or trial credits: sign up with that developer and create a key in its own console. This page currently has hand-checked entries for Anthropic, Google, Mistral. For the other developers listed above we only link to their official pages, so check those pages for current terms.

Where can I get a free LLM API key?

From the developer itself. Each link below goes to a page that says what that developer's own documentation states about its free API access, with a source link and a check date:

  • Claude API — One-time trial credits, checked 2026-10-13
  • Gemini API — Ongoing free tier, checked 2026-10-13
  • Mistral API — Ongoing free tier, checked 2026-10-13

For other developers, use the official links under “Other developers” above.

Methodology: entries are entered by hand from each developer's own documentation and not verified by a real API call; each entry shows the date it was last checked. Free-tier terms change without notice — always confirm current limits on the developer's own page before relying on a free tier in production. If something below looks out of date, the linked official page is the source of truth.