Gemini 3.1 Pro vs Gemini 3 Pro
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
Gemini 3.1 Pro
Google · Mar 2026
Google's flagship with the industry's largest context window — 2M tokens — and frontier multimodal reasoning at $2/$12.
Gemini 3 Pro
73.6Google · Nov 2025
Google's November 2025 frontier breakout — 91.9% GPQA Diamond and 37.5% HLE made it the reasoning leader of its generation.
The verdict
Gemini 3.1 Pro wins 1 of the 1 benchmarks these models share, against 0 for Gemini 3 Pro. Gemini 3.1 Pro also takes 2M of context versus 1M for Gemini 3 Pro.
Benchmark head-to-head 1–0
Specs & pricing
| Gemini 3.1 Pro | Gemini 3 Pro | |
|---|---|---|
| modhub Index | — | 73.6 |
| Input price / 1M | $2 | $2 |
| Output price / 1M | $12 | $12 |
| Context window | 2M | 1M |
| Max output | 66K | 66K |
| Open weights | no | no |
| Reasoning model | yes | yes |
| Multimodal input | text, image, audio, video | text, image, audio, video |
| Knowledge cutoff | Nov 2025 | Jan 2025 |
| Released | Mar 2026 | Nov 2025 |
| Example monthly cost* | $38.00 | $38.00 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, Gemini 3.1 Pro or Gemini 3 Pro?
- Gemini 3.1 Pro wins 1 of the 1 benchmarks these models share, against 0 for Gemini 3 Pro. Gemini 3.1 Pro also takes 2M of context versus 1M for Gemini 3 Pro.
- Which is cheaper, Gemini 3.1 Pro or Gemini 3 Pro?
- Gemini 3.1 Pro costs $2/$12 per million input/output tokens, while Gemini 3 Pro costs $2/$12. For a typical workload of 10M input and 1.5M output tokens per month, that's $38.00 versus $38.00.
- Which model is better for coding, Gemini 3.1 Pro or Gemini 3 Pro?
- On SWE-bench Verified — the standard agentic-coding benchmark — Gemini 3.1 Pro scores ~78% versus 76.2% for Gemini 3 Pro, making Gemini 3.1 Pro the stronger pick for coding agents.