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Gemini 3.1 Pro

GoogleProprietaryPending Human Review

Gemini 3.1 Pro is an independently released Pro update for complex reasoning, software engineering, and multimodal work. It is available as a public API preview with a million-token input context and adjustable thinking. A separate custom-tools endpoint prioritizes developer-supplied tools when built-in and custom tools are combined; that serving variant is represented on this page.

2026-02-19
Unreleased
Undisclosed proprietary architecture
Proprietary

Specifications

Parameters
Unreleased
Architecture
Undisclosed proprietary architecture
License
Proprietary
Context Window
1,048,576 tokens
Max Output
65,536 tokens
Type
multimodal
Modalities
textimageaudiovideo

Benchmark Scores

Advanced Specifications

Model Family
Gemini
API Access
Available
Chat Interface
Not Available
Variants
gemini-3.1-pro-previewgemini-3.1-pro-preview-customtools

Capabilities & Limitations

Capabilities
complex reasoningagentic codingmultimodal understandingtool usestructured outputs
Known Limitations
Generated answers and tool arguments can be incorrect and need verification.Preview endpoints and tools may change or have more restrictive availability.
Notable Use Cases
technical problem solvingsoftware engineeringlong-document analysis
Function Calling Support
Yes
Tool Use Support
Yes

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