Gemini 3.1 Pro
Gemini 3.1 Pro is a Google model with 1.05M context, $2 in / $12 out per million tokens, last verified October 1, 2026. Open weights: no. Public-board scores are linked to the publisher; vendor-only figures stay in the watch-out, not on the board.
Gemini 3.1 Pro Preview is Google's multimodal Pro endpoint with a 1,048,576-token input limit and 65,536-token output limit.
Recorded profile verification October 1, 2026Individual provider fields may changeAccess: preview — The catalogued Gemini API ID remains a preview endpoint.
| Specification | Gemini 3.1 Pro |
|---|---|
| Provider | |
| Tier | Frontier |
| Context window | 1.05M |
| Max output | 66K |
| Input / 1M tokens | $2 |
| Output / 1M tokens | $12 |
| Weights | Closed |
| Parameters | Not verifiedUnverified |
| Reasoning levels | low, medium, high |
| Modalities | text, image, video, audio, pdf |
| API model id | gemini-3.1-pro-preview |
| Released | February 19, 2026 |
Pricing tiers: The current Gemini developer guide lists $2/$12 per MTok below 200K input and $4/$18 above 200K, including thinking output. It leaves the exact 200K boundary unspecified; confirm that boundary and other processing/cache tiers before budgeting. The exact API ID remains gemini-3.1-pro-preview. Restricted Gemini 4 Argon is a separate preview and does not make this endpoint stable.
Publisher evidence
Published benchmark results
Each result keeps its source date visible. Dates refer to source publication or capture unless the source explicitly states when it measured the result. A missing benchmark is not treated as a zero.
| Benchmark | Score | Source date | Source |
|---|---|---|---|
| SWE-bench Verified | 80.6% | 2026-02 | Google DeepMind model evaluation report (vendor, Thinking High, avg of 10 runs, +0.6 disclosed adjustment) · View source |
| GPQA Diamond | 94.3% | 2026-02 | Google DeepMind model evaluation report (vendor, no tools, pass@1) · View source |
| Humanity's Last Exam | 44.4% | 2026-02 | Google DeepMind model evaluation report (vendor, no tools; 51.4 with search+code) · View source |
| Terminal-Bench 2.1 | 73.8% | 2026-07 | Google DeepMind model evaluation report (vendor, Terminus-2; own Feb report separately reported TB 2.0 = 68.5 — versions preserved) · View source |
Best for
- Very long documents
- Multimodal reasoning
- Frontier knowledge work
Watch out
History
Gemini 3.1 Pro timeline
Release and status events for this model that passed two-source verification — dated, sourced, and linked.
- Gemini 3.1 Pro PreviewLimited previewFebruary 19, 2026
Limited preview access began; not treated as a general-availability catalog release date.
Gemini API deprecations (release dates)
Source receipts
Catalog figures for this model were checked against the following sources.
- Google primary profile — whole-record source check October 1 (accessed 2026-10-01)
- Gemini current API pricing and cache-storage tiers (accessed 2026-10-01)
- Gemini developer guide — exact Preview rates and boundary limitation (accessed 2026-10-01)
- Gemini API 3.1 Pro Preview — exact endpoint and customtools scope (accessed 2026-10-01)
- Google Cloud — Gemini 3.1 Pro (accessed 2026-08-29)
- TechCrunch — Gemini 3.1 Pro (accessed 2026-08-29)
Common questions
Gemini 3.1 Pro
Answered from the verified figures on this page rather than general guidance.