Gemini 3.1 Pro
About this model
Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows. Building on the multimodal foundation of the Gemini 3 series, it combines high-precision reasoning across text, image, video, audio, and code with a 1M-token context window. Reasoning Details must be preserved when using multi-turn tool calling, see our docs here: https://openrouter.ai/docs/use-cases/reasoning-tokens#preserving-reasoning. The 3.1 update introduces measurable gains in SWE benchmarks and real-world coding environments, along with stronger autonomous task execution in structured domains such as finance and spreadsheet-based workflows. Designed for advanced development and agentic systems, Gemini 3.1 Pro Preview improves long-horizon stability and tool orchestration while increasing token efficiency. It introduces a new medium thinking level to better balance cost, speed, and performance. The model excels in agentic coding, structured planning, multimodal analysis, and workflow automation, making it well-suited for autonomous agents, financial modeling, spreadsheet automation, and high-context enterprise tasks.
Performance Tier
Gemini 3.1 Pro is a flagship model from Gemini : the most capable in their lineup.
Best-in-class model from this provider. Highest performance across benchmarks, ideal for demanding tasks.
Pricing
This model is included in Elosia plans| Type | per 1M tokens |
|---|---|
| Input (prompt) | $2.00 |
| Output (completion) | $12.00 |
| Image | $2.00 |
| Internal reasoning | $12.00 |
| Cache read | $0.200 |
| Cache write | $0.375 |
Capabilities
Benchmarks
Recommended Use Cases
Strengths
- ARC-AGI-2 77.1% — more than double Gemini 3 Pro reasoning score
- Top-tier software engineering (SWE-bench 80.6%)
- Exceptional science reasoning (GPQA Diamond 94.3%)
- Enhanced agentic reliability for complex autonomous workflows
Limitations
- Preview model — may have stability changes
- Premium pricing ($2/$12 per M tokens)
Resources
This model may use your data for training
