---
id: "2026-02-19-gemini-3-1-pro"
url: "https://postcutoff.com/e/2026-02-19-gemini-3-1-pro/"
as_of: "2026-11-13T13:49:00+01:00"
date: "2026-02-19"
date_precision: day
category: model-release
importance: 4
confidence: high
status: [Confirmed]
sources: 4
editor: human editor
human_review: null
version: "2026-10-04"
---

As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2026-02-19-gemini-3-1-pro/

# Google releases Gemini 3.1 Pro, scoring 77.1% on ARC-AGI-2

Gemini 3.1 Pro (preview, 19 Feb 2026) more than doubled Gemini 3 Pro's reasoning on ARC-AGI-2 (verified 77.1% vs 31.1%), and as of late Sept 2026 remained Google's newest Pro-tier model because Gemini 3.5 Pro kept slipping.

## Key facts
- Released in preview 2026-02-19 (gemini-3.1-pro-preview and gemini-3.1-pro-preview-customtools)
- ARC-AGI-2 verified: 77.1% (Gemini 3 Pro: 31.1%)
- Available in Gemini API/AI Studio, Gemini CLI, Antigravity, Android Studio, Vertex AI, Gemini Enterprise, Gemini app, NotebookLM
- gemini-3-pro-preview shut down 2026-03-09 and redirected to 3.1 Pro
- Still listed as a preview model in the Gemini API models page in late Sept 2026

## What happened

Google shipped Gemini 3.1 Pro as a preview across developer, enterprise and consumer products, positioning it as a stronger baseline for complex problem-solving.

## Why it matters

The ARC-AGI-2 jump was among the largest single-release gains on that benchmark. It also became Google's last flagship release for at least seven months.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): in its training data
- Claude Opus 5.5 (training cutoff June 2026): in its training data
- Gemini 4 Hydrogen (training cutoff March 2026): in its training data
- Grok 4.7 (training cutoff May 2026): in its training data

## Sources

1. [Gemini 3.1 Pro: a smarter model for your most complex tasks (Google blog)](https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-1-pro/) (blog.google, official)
2. [Gemini 3.1 Pro model card](https://deepmind.google/models/model-cards/gemini-3-1-pro/) (deepmind.google, official)
3. [Google Cloud: Gemini 3.1 Pro on Gemini CLI, Gemini Enterprise and Vertex AI](https://cloud.google.com/blog/products/ai-machine-learning/gemini-3-1-pro-on-gemini-cli-gemini-enterprise-and-vertex-ai) (cloud.google.com, official)
4. [DataCamp: Gemini 3.1 features and benchmarks](https://www.datacamp.com/blog/gemini-3-1) (datacamp.com, press)

## Changes

- 2026-09-29 (filed): Created

## Related

- 2026-09-23: [DeepMind says Gemini 4 has entered post-training and will ship "much earlier" than end of 2026](https://postcutoff.com/e/2026-09-23-gemini-4-post-training/index.md)
- 2026-05-19: [Google I/O 2026: Gemini 3.5 Flash, Gemini Spark agent and Antigravity 2.0](https://postcutoff.com/e/2026-05-19-gemini-3-5-flash-io-2026/index.md)