{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/gemini-3-1-pro/","md":"https://postcutoff.com/m/gemini-3-1-pro/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":"gemini-3-1-pro","name":"Gemini 3.1 Pro","org":"Google DeepMind","family":"Gemini 3","released":"2026-02-19","status":"preview","type":"reasoning-llm","modality_in":["text","image","audio","video","pdf"],"modality_out":["text"],"open_weights":false,"model_license":"proprietary","context_window":1048576,"max_output":65536,"knowledge_cutoff":"2025-01","pricing":{"input":2,"output":12,"unit":"per 1M tokens (Standard, prompts <=200k; >200k: $4.00 in / $18.00 out)","source":"https://ai.google.dev/gemini-api/docs/pricing"},"price_line":"$2 in, $12 out per 1M tokens","access":[{"provider":"Gemini API","model_id":"gemini-3.1-pro-preview","endpoint":"https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-pro-preview:generateContent","docs":"https://ai.google.dev/gemini-api/docs/models/gemini-3.1-pro-preview"},{"provider":"Google Cloud Gemini Enterprise Agent Platform (Vertex AI)","docs":"https://docs.cloud.google.com/gemini-enterprise-agent-platform/models/gemini/3-1-pro"},{"provider":"OpenRouter","model_id":"google/gemini-3.1-pro-preview"},{"provider":"Web app","url":"https://gemini.google.com"}],"capabilities":[{"name":"Novel-pattern reasoning","detail":"Verified 77.1% on ARC-AGI-2, more than double Gemini 3 Pro.","first":false,"discovered":"launch","source":"https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-1-pro/"},{"name":"Custom-tools agent variant","detail":"Separate id gemini-3.1-pro-preview-customtools tuned for agentic workflows using custom tools and bash.","first":false,"discovered":"launch","source":"https://ai.google.dev/gemini-api/docs/models/gemini-3.1-pro-preview"},{"name":"Code-generated visuals","detail":"Showcased animated SVG generation, live dashboards and interactive 3D experiences from prompts.","first":false,"discovered":"launch","source":"https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-1-pro/"}],"entry":null,"notes":"Knowledge cutoff January 2025: Google's Gemini 3.1 Pro model card gives no date and says the model 'is based on Gemini 3 Pro', whose model card states January 2025 (storage.googleapis.com/deepmind-media/Model-Cards/Gemini-3-Pro-Model-Card.pdf); so the newest Pro knows a year less than the Flash models (March 2026). The newest Pro-tier model callable in the Gemini API (preview). Gemini 3.5 Pro, announced at I/O 2026, has not shipped; Google's new top model is Gemini 4 Argon (announced 2026-09-30, which replaces the '3.x Pro' naming), but at launch it was open only to the Fairwind cyber-defense program, with paid API access announced as next and no date. Predecessor gemini-3-pro-preview is shut down. Newer 3.5+ Flash models beat it on many agentic and coding benchmarks at lower cost. Vertex model id not verified.","verified":"2026-10-12","body_md":"Google's Pro-tier reasoning model (preview), the newest one in the Gemini API until Gemini 4 Argon became generally available on 2026-10-13 (Google has announced no deprecation; it stays in the Gemini app model picker per 9to5Google). Good for hard reasoning, long-context analysis and complex code, though 3.8 Flash is often better value.\n\n```bash\ncurl \"https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-pro-preview:generateContent\" \\\n  -H \"x-goog-api-key: $GEMINI_API_KEY\" -H \"Content-Type: application/json\" \\\n  -d '{\"contents\":[{\"parts\":[{\"text\":\"Prove that sqrt(2) is irrational\"}]}]}'\n```\n\nSources: [model page](https://ai.google.dev/gemini-api/docs/models/gemini-3.1-pro-preview), [pricing](https://ai.google.dev/gemini-api/docs/pricing), [launch blog](https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-1-pro/), [Gemini 4 Argon announcement](https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-4-argon/).","page_url":"https://postcutoff.com/m/gemini-3-1-pro/","events_after":2037,"major_after":476,"historic_after":90,"missing_at_launch":110,"events_since_release":null,"you_url":"https://postcutoff.com/you/gemini-3-1-pro/","briefings":{"xs":"https://postcutoff.com/briefings/cutoff-2025-01-xs.md","s":"https://postcutoff.com/briefings/cutoff-2025-01-s.md","m":"https://postcutoff.com/briefings/cutoff-2025-01-m.md","full":"https://postcutoff.com/briefings/cutoff-2025-01.md"}}