Gemini 3.1 Pro is Google's most advanced reasoning model, built for complex problem-solving across mathematics, STEM, and software engineering. Launched in February 2026, it outperforms its predecessor Gemini 3 Pro across reasoning and multimodal benchmarks, scoring 77.1% on ARC-AGI-2 abstract reasoning and 80.6% on SWE-Bench Verified for real-world coding. With a 1M-token context window and multimodal inputs spanning text, audio, images, video, and entire code repositories, it analyzes large codebases, scientific papers, and heterogeneous datasets in a single request. The model supports an extended thinking mode, function calling, structured outputs, and code execution, enabling sophisticated agentic workflows and research applications. Versus Gemini 2.5 Pro, this generation delivers substantially better agentic performance and reasoning depth. For straightforward, cost-sensitive tasks, Gemini 3.1 Flash Lite is more economical, but Gemini 3.1 Pro remains the top choice for frontier-level reasoning and coding.
Gemini 3.1 Pro Preview runs on 2 different routes through the Opper gateway. Compare residency, ZDR, and training posture at a glance β full data-handling detail per route below.
| Provider | Region | Zero data retention | Training | Input | Output |
|---|---|---|---|---|---|
| Gemini | US | Enterprise | No | $2.00 | $12.00 |
| Google Cloud | US | Enterprise | No | $2.00 | $12.00 |
Training posture across routes: No training on prompts by default.
Each route hosting Gemini 3.1 Pro Preview has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.
Zero data retention is available via Opper Enterprise contract. No training on customer data. US; SCCs; DPA available.
Zero data retention is available via Opper Enterprise contract. No training on customer data. US; SCCs; DPA available.
Independent benchmark scores β composite indices for reasoning, coding, and math, plus individual eval scores where available.
Call Gemini 3.1 Pro Preview through the Opper gateway with one API key. Let your coding agent set it up, or call it directly β Opper is drop-in compatible with the OpenAI, Anthropic, and Google AI SDKs.
Copy this and paste it into your coding agent β Claude Code, Cursor, Codex, and more β and it'll wire up Opper for you.
import OpenAI from "openai";const client = new OpenAI({apiKey: process.env.OPPER_API_KEY,baseURL: "https://api.opper.ai/v3/compat",});const completion = await client.chat.completions.create({model: "gemini/gemini-3.1-pro-preview",messages: [{ role: "user", content: "Hello" }],});console.log(completion.choices[0].message.content);
Side-by-side on privacy, EU hosting, pricing, and benchmarks.
