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.
Changelog
- 2026-09-29: created
Related events
- Google I/O 2026: Gemini 3.5 Flash, Gemini Spark agent and Antigravity 2.0 ★★★★
- DeepMind says Gemini 4 has entered post-training and will ship "much earlier" than end of 2026 ★★★
Sources (4)
- officialGemini 3.1 Pro: a smarter model for your most complex tasks (Google blog)
- officialGemini 3.1 Pro model card
- officialGoogle Cloud: Gemini 3.1 Pro on Gemini CLI, Gemini Enterprise and Vertex AI
- pressDataCamp: Gemini 3.1 features and benchmarks
id: 2026-02-19-gemini-3-1-pro · updated 2026-09-29 · open in the interactive timeline