Gemini 3.1 Pro Preview by Google AI Studio

Free coding model via Google AI Studio (tier S+, SWE-bench ~78%).

Access
Free API tier
Free limits
Free tier
Modality
code, text
Credit card
Not required
Commercial use
Unclear, verify
Context window
1,000,000 tokens
Performance tier
Frontier
Model ID
gemini-3.1-pro-preview
Last verified
June 2026

Frequently asked

Is Gemini 3.1 Pro Preview free?

Yes. Google AI Studio offers it as Free API tier with these limits: Free tier. No credit card is required.

Can I use Gemini 3.1 Pro Preview commercially?

Commercial terms are not clearly documented. Check the provider's current terms before shipping.

How do I start using Gemini 3.1 Pro Preview?

Free coding model via Google AI Studio (tier S+, SWE-bench ~78%).

Building with this model?

We wire free-tier and open-weight models into production stacks: evals against your real inputs, failover, cost caps.

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