{"schema":"postcutoff/event@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/e/2025-11-18-gemini-3/","md":"https://postcutoff.com/e/2025-11-18-gemini-3/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"2025-11-18-gemini-3","date":"2025-11-18","date_precision":"day","short_title":"Google launches Gemini 3","deck":null,"takeaway":"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.","category":"model-release","category_label":"Model releases","importance":5,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":[{"n":1,"title":"A new era of intelligence with Gemini 3 (Google)","url":"https://blog.google/products/gemini/gemini-3/","type":"official","group":"primary","domain":"blog.google"},{"n":2,"title":"Gemini 3 (Google DeepMind)","url":"https://deepmind.google/models/gemini/","type":"official","group":"primary","domain":"deepmind.google"},{"n":3,"title":"TechCrunch: Gemini 3 refused to believe it was 2025, and hilarity ensued","url":"https://techcrunch.com/2025/11/20/gemini-3-refused-to-believe-it-was-2025-and-hilarity-ensued/","type":"press","group":"press","domain":"techcrunch.com"},{"n":4,"title":"Karpathy on X: Gemini 3 refused to believe it was 2025","url":"https://x.com/karpathy/status/1990855382756164013","type":"discussion","group":"reactions","domain":"x.com"},{"n":5,"title":"Alice Blair (LessWrong): Gemini 3 is Evaluation-Paranoid and Contaminated","url":"https://www.lesswrong.com/posts/8uKQyjrAgCcWpfmcs/gemini-3-is-evaluation-paranoid-and-contaminated","type":"discussion","group":"reactions","domain":"lesswrong.com"}],"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Google DeepMind"],"title":"Google launches Gemini 3","summary":"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)"],"key_numbers":[],"tags":["llm","reasoning","gemini","multimodal","agents"],"science":null,"body_md":"## What happened\n\nGoogle's third-generation Gemini model took the lead on many leaderboards and was deployed across Google's products immediately.\n\n## Why it matters\n\nWidely seen as putting Google at the top of the frontier; press reported OpenAI declared an internal 'code red' in response.","disputed":[],"related":[{"id":"2025-12-11-gpt-5-2","url":"https://postcutoff.com/e/2025-12-11-gpt-5-2/","date":"2025-12-11","date_precision":"day","short_title":"OpenAI releases GPT-5.2","deck":null,"takeaway":"Illustrated the compressed release cadence of late 2025, with frontier leadership changing hands within weeks.","category":"model-release","category_label":"Model releases","importance":3,"confidence":"medium","status":{"key":"partly","labels":["Partly confirmed"]},"sources":2,"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["OpenAI"]},{"id":"2025-03-25-gemini-2-5-pro","url":"https://postcutoff.com/e/2025-03-25-gemini-2-5-pro/","date":"2025-03-25","date_precision":"day","short_title":"Gemini 2.5 Pro takes the top of the leaderboards","deck":null,"takeaway":"Google moved from follower to co-leader of the frontier race, reshaping competitive dynamics in 2025.","category":"model-release","category_label":"Model releases","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":2,"official":1,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Google DeepMind"]}],"people":[{"id":"andrej-karpathy","name":"Andrej Karpathy","url":"https://postcutoff.com/person/andrej-karpathy/"}],"posts":[{"id":"x-karpathy-1990855382756164013","title":"“My most amusing interaction was where the model (I think I was given some earlier version…”","url":"https://postcutoff.com/p/x-karpathy-1990855382756164013/"}],"videos":[],"models":[],"changes":[{"date":"2026-09-29","type":"edit","text":"Added the temporal-confusion quirk (Karpathy, Alice Blair) from docs/cutoff-blindness research"},{"date":"2026-09-29","type":"filed","text":"Created"}],"provenance":{"agents":[{"model":"Claude Opus 5.5","maker":"Anthropic","tool":"Claude Code"}],"filed":"2026-09-29","run":null,"sources_read":null,"updated":"2026-09-29","human_review":null,"version":{"date":"2026-10-04"}},"gaps":[{"model_id":"gpt-6-astra","name":"GPT-6 Astra","cutoff":"2026-04","days_after":null,"in_training_data":true},{"model_id":"claude-opus-5-5","name":"Claude Opus 5.5","cutoff":"2026-06","days_after":null,"in_training_data":true},{"model_id":"gemini-4-hydrogen","name":"Gemini 4 Hydrogen","cutoff":"2026-03","days_after":null,"in_training_data":true},{"model_id":"grok-4-7","name":"Grok 4.7","cutoff":"2026-05","days_after":null,"in_training_data":true}],"short_url":"https://postcutoff.com/s/google-gemini-3"}