Gemini 3.1 Pro

Claims and evidence

• Released 19 February 2026Released as a preview model for developers and enterprises; rollout in the Gemini app and NotebookLM started the same day. ● Primary source[1] [3]February 19, 2026 [4]gemini-3.1-pro-preview: release date [5]Versions: Release date

• Status PreviewReleased in preview with general availability promised soon; still a preview model on 2026-10-01, with no shutdown date announced. ● Primary source[2]Gemini 3, Preview [4]Gemini 3 models, Preview models: gemini-3.1-pro-preview [5]Versions: Launch stage

• Successor of Gemini 3 ProThe announcement presents 3.1 Pro as building on the Gemini 3 series with improvements since Gemini 3 Pro; the model card says it is based on Gemini 3 Pro; since 2026-03-09 the gemini-3-pro-preview id points to gemini-3.1-pro-preview. ● Primary source[1]third paragraph; What's next [6]Model Information: Model dependencies [3]March 9, 2026

• Change · Reasoning Adds MEDIUM as a thinking level.Compared with Gemini 3 Pro ● Primary source[5]Quality improvements
• Change · Tool use Offers a separate endpoint, gemini-3.1-pro-preview-customtools, tuned to prioritise custom tools for developers who mix bash and custom tools.Compared with Gemini 3 Pro ● Primary source[3]February 19, 2026 [7]
• Change · Efficiency Google lists more efficient thinking and improved token efficiency.Compared with Gemini 3 Pro ● Primary source[5]Quality improvements

• Input text, image, audio, videoPDF input is also supported. ● Primary source[7]Supported data types: Inputs [6]Inputs
• Output text ● Primary source[7]Supported data types: Output
• Feature Reasoning modeAdds a MEDIUM thinking level. ● Primary source[7]Capabilities: Thinking [5]Quality improvements
• Feature Function calling ● Primary source[7]Capabilities: Function calling
• Context window 1,048,576 tokensInput token limit; the output limit is 65,536 tokens. The model card gives a context window of up to 1M. ● Primary source[7]Token limits: Input token limit
• Parameters Not disclosedNot disclosed by Google. No claim madeNo source
• Access API, consumer appAPI: the Gemini API (Google AI Studio) and Vertex AI, in preview. Consumer: the Gemini app (higher limits on Google AI Pro and Ultra plans) and NotebookLM (Pro and Ultra users only). ● Primary source[1]Starting today, 3.1 Pro is rolling out [6]Distribution

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