Gemini 3.1 Pro Released: Google's Huge Leap in Reasoning
Google has quietly rolled out Gemini 3.1 Pro, an update that looks minor in version number but delivers a massive step-function improvement in the model's fundamental reasoning capabilities.
Quick Answer:
Gemini 3.1 Pro represents a major architecture optimization from Google, boasting state-of-the-art results in competitive programming and advanced mathematics, placing it firmly alongside Claude Opus 4.6 and GPT-5.3. Pricing remains competitive at approximately $1.25 (approx £1.00) / 1M input tokens.
The Reasoning Breakthrough
While previous iterations of Gemini Pro were praised for multimodal integration and speed, they sometimes lagged in sustained, multi-step logical reasoning compared to frontier tier models from OpenAI and Anthropic. Gemini 3.1 Pro introduces what Google researchers call "Recursive Thought Structuring," allowing the model to organically build and verify logic trees before generating output.
Performance in Math and Coding
The most visible improvements are in STEM domains. Independent benchmarks over the last 48 hours show Gemini 3.1 Pro solving complex, college-level physics problems without specialized prompts while heavily minimizing hallucinated formulas.
| Benchmark Suite | Gemini 3.1 Pro Score | Gemini 3.0 Pro Score |
|---|---|---|
| MATH (Competition Level) | 82.4% | 55.1% |
| SWE-bench Resolved | 41.8% | 22.4% |
Deep Google Ecosystem Integration
Beyond raw intelligence, this model serves as the new central engine for Google Workspace and Antigravity IDE. Users report that 3.1 Pro's ability to cross-reference data seamlessly between Google Drive, Docs, and local codebases without losing context is its most significant day-to-day advantage.
Frequently Asked Questions
When is Gemini 3.1 Pro available via API?
It is currently rolling out to Google Cloud Vertex AI customers and via Google AI Studio as of late February 2026.
Last updated: February 2026.
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