Model Tracker

Gemini 3.1 Pro

Gemini 3.1 Pro is an AI model made by Google. Google released it on 19 February 2026. It is in preview. It takes text, image, video, audio and returns text.

Google

Gemini 3.1 Pro is an AI model made by Google. Google released it on 19 February 2026. It is in preview. It takes text, image, video, audio and returns text. Through the API it costs $2.00 per 1M tokens for input and $12.00 per 1M tokens for output.

Released: 19 February 2026 — ai.google.dev, read 16 October 2026
Status: Preview — ai.google.dev, read 16 October 2026
Takes: Text, Image, Video, Audio — ai.google.dev, read 16 October 2026
Returns: Text — ai.google.dev, read 16 October 2026
Open weights: Not confirmed: The reviewed official model page and model card do not state whether Gemini 3.1 Pro's weights are open or downloadable.
Licence: Not confirmed: The reviewed official model page and model card do not name a licence for Gemini 3.1 Pro.
Context window: Not confirmed: two readings disagree: 1048576 and 1000000
Longest answer: Not confirmed: two readings disagree: 65536 and 64000
Knowledge cutoff: Not confirmed: The reviewed official model page and model card do not state a knowledge cutoff.
API price, input: $2.00 per 1M tokens — ai.google.dev, read 16 October 2026
API price, output: $12.00 per 1M tokens — ai.google.dev, read 16 October 2026
Where: Consumer app, Cloud marketplaces, API — deepmind.google, read 16 October 2026
Parameters: Not confirmed: The reviewed official model page and model card do not publish a parameter count.
Model card: https://deepmind.google/models/model-cards/gemini-3-1-pro/ — ai.google.dev, read 16 October 2026

Benchmarks

Measured by others, not by the maker: each score with the name the measurer gives the model and the setting it ran, its day and its licence.

Epoch AI

Epoch Capabilities Index, Gemini 3.1 Pro: 154.7 (152.5–157.1), as of 19 October 2026
GPQA Diamond, gemini-3.1-pro-preview_high: 94.4% (± 1.6), run 6 August 2026
GPQA Diamond, gemini-3.1-pro-preview: 94.1% (± 1.7), run 20 February 2026
FrontierMath, tiers 1–3, gemini-3.1-pro-preview: 59.6% (± 2.9), run 11 June 2026
FrontierMath, tier 4, gemini-3.1-pro-preview: 26.8% (± 7.0), run 11 June 2026
SWE-bench Verified, gemini-3.1-pro-preview-customtools: 75.6% (± 2.0), run 24 February 2026
OTIS Mock AIME 2024–2025, gemini-3.1-pro-preview: 95.6% (± 3.1), run 20 February 2026
OTIS Mock AIME 2024–2025, gemini-3.1-pro-preview_high: 95.6% (± 3.1), run 6 August 2026
SimpleQA Verified, gemini-3.1-pro-preview_high: 73.5% (± 1.4), run 10 August 2026

Epoch AI, ‘Capabilities & benchmarking’, epoch.ai/benchmarks, CC BY 4.0: Epoch AI’s own runs and its Capabilities Index. Data · CC BY 4.0

Questions

When was Gemini 3.1 Pro released?

Google released Gemini 3.1 Pro on 19 February 2026.

Is Gemini 3.1 Pro still available?

It is in preview: Google has not made it generally available yet.

How much does the Gemini 3.1 Pro API cost?

On the standard tier, Gemini 3.1 Pro costs $2.00 per 1M tokens for input and $12.00 per 1M tokens for output, as Google lists it.

What does Gemini 3.1 Pro take and return?

Gemini 3.1 Pro takes text, image, video, audio and returns text.

Sources

Gemini 3.1 Pro preview | Gemini API | Google AI for Developers (read 16 October 2026)
Release notes | Gemini API | Google AI for Developers (read 16 October 2026)
Gemini Developer API pricing | Gemini API | Google AI for Developers (read 16 October 2026)
Gemini 3.1 Pro - Model Card — Google DeepMind (read 16 October 2026)

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