What is Gemini 3.1 Pro?

Gemini 3.1 Pro is Google DeepMind's latest flagship AI model, released February 19, 2026. It is an incremental but significant upgrade to Gemini 3 Pro, focused on improved reasoning, agentic workflows, and scientific problem-solving. It supports a 1M token context window and 64K output tokens.

How much does Gemini 3.1 Pro cost?

Gemini 3.1 Pro is priced at $2 per million input tokens and $12 per million output tokens for prompts under 200K tokens. For longer contexts between 200K and 1M tokens, rates increase to $4 per million input tokens and $18 per million output tokens. Google's Batch API offers a 50% discount for asynchronous workloads.

How does Gemini 3.1 Pro compare to Claude Opus 4.6?

Gemini 3.1 Pro leads on most reasoning and coding benchmarks at roughly 2.5x lower cost. Claude Opus 4.6 performs better on expert task preferences, SWE-Bench Verified, and Humanity's Last Exam with tools. The right choice depends on whether you prioritize broad reasoning performance or nuanced expert judgment.

Is Gemini 3.1 Pro available now?

Yes, Gemini 3.1 Pro is currently available in preview. It is accessible through the Gemini API in Google AI Studio, Vertex AI, Gemini CLI, Android Studio, the Gemini app, and NotebookLM for Pro and Ultra subscribers. General availability is expected soon.

Can I use Gemini 3.1 Pro with Thesys C1?

Yes. Gemini 3.1 Pro is supported through C1 by Thesys, which is compatible with any OpenAI-compatible LLM endpoint. Developers can use it to generate dynamic, interactive UI components powered by Gemini’s improved reasoning capabilities.