---
id: "2025-11-18-gemini-3"
url: "https://postcutoff.com/e/2025-11-18-gemini-3/"
as_of: "2026-11-13T13:49:00+01:00"
date: "2025-11-18"
date_precision: day
category: model-release
importance: 5
confidence: high
status: [Confirmed]
sources: 5
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/2025-11-18-gemini-3/

# Google launches Gemini 3

Google released Gemini 3 Pro, which topped LMArena with a 1501 Elo and led many reasoning and multimodal benchmarks, shipping on day one across Search, the Gemini app and a new agentic IDE, Google Antigravity.

## Key facts
- Released 18 November 2025
- LMArena: 1501 Elo, #1 at launch, per Google
- Humanity's Last Exam: 37.5% without tools, per Google
- Launched in Google Search AI Mode on day one
- Gemini 3 Deep Think mode for subscribers; Google Antigravity agentic development platform
- Known quirk: without search, Gemini 3 insisted it was 2024 and called real 2025 evidence fake (Karpathy, pre-launch); its reasoning often treated the present as a simulation (see docs/cutoff-blindness cases 012, 013, 015)

## What happened

Google's third-generation Gemini model took the lead on many leaderboards and was deployed across Google's products immediately.

## Why it matters

Widely seen as putting Google at the top of the frontier; press reported OpenAI declared an internal 'code red' in response.

## 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. [A new era of intelligence with Gemini 3 (Google)](https://blog.google/products/gemini/gemini-3/) (blog.google, official)
2. [Gemini 3 (Google DeepMind)](https://deepmind.google/models/gemini/) (deepmind.google, official)
3. [TechCrunch: Gemini 3 refused to believe it was 2025, and hilarity ensued](https://techcrunch.com/2025/11/20/gemini-3-refused-to-believe-it-was-2025-and-hilarity-ensued/) (techcrunch.com, press)
4. [Karpathy on X: Gemini 3 refused to believe it was 2025](https://x.com/karpathy/status/1990855382756164013) (x.com, discussion)
5. [Alice Blair (LessWrong): Gemini 3 is Evaluation-Paranoid and Contaminated](https://www.lesswrong.com/posts/8uKQyjrAgCcWpfmcs/gemini-3-is-evaluation-paranoid-and-contaminated) (lesswrong.com, discussion)

## Changes

- 2026-09-29: Added the temporal-confusion quirk (Karpathy, Alice Blair) from docs/cutoff-blindness research
- 2026-09-29 (filed): Created

## Related

- 2025-12-11: [OpenAI releases GPT-5.2](https://postcutoff.com/e/2025-12-11-gpt-5-2/index.md)
- 2025-03-25: [Gemini 2.5 Pro takes the top of the leaderboards](https://postcutoff.com/e/2025-03-25-gemini-2-5-pro/index.md)
- People: [Andrej Karpathy](https://postcutoff.com/person/andrej-karpathy/)
- Archived: 1 post, listed in https://postcutoff.com/e/2025-11-18-gemini-3/index.json