Gemini 3.1 Pro
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