{"schema":"postcutoff/event@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/e/2025-07-11-kimi-k2/","md":"https://postcutoff.com/e/2025-07-11-kimi-k2/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":"2025-07-11-kimi-k2","date":"2025-07-11","date_precision":"day","short_title":"Moonshot AI releases Kimi K2, a 1-trillion-parameter open-weights agentic model","deck":null,"takeaway":"Beijing-based Moonshot AI open-sourced Kimi K2, a 1T-parameter mixture-of-experts model (32B active) optimized for agentic tasks and coding, among the strongest open-weight non-reasoning models at release.","category":"open-source","category_label":"Open source","importance":3,"confidence":"medium","status":{"key":"partly","labels":["Partly confirmed"]},"sources":[{"n":1,"title":"Kimi K2: Open Agentic Intelligence (Moonshot AI)","url":"https://moonshotai.github.io/Kimi-K2/","type":"official","group":"primary","domain":"moonshotai.github.io"},{"n":2,"title":"MoonshotAI/Kimi-K2 (code & weights)","url":"https://github.com/MoonshotAI/Kimi-K2","type":"code","group":"primary","domain":"github.com"}],"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Moonshot AI"],"title":"Moonshot AI releases Kimi K2, a 1-trillion-parameter open-weights agentic model","summary":"Beijing-based Moonshot AI open-sourced Kimi K2, a 1T-parameter mixture-of-experts model (32B active) optimized for agentic tasks and coding, among the strongest open-weight non-reasoning models at release.","key_facts":["Released 11 July 2025","1 trillion total parameters, 32B activated","Trained with the MuonClip optimizer on 15.5T tokens","Released under a modified MIT license"],"key_numbers":[],"tags":["llm","open-weights","mixture-of-experts","china","agents"],"science":null,"body_md":"## What happened\n\nMoonshot released open weights for a trillion-parameter model focused on tool use and coding.\n\n## Why it matters\n\nPart of a 2025 wave (DeepSeek, Qwen, Kimi, GLM) that made Chinese labs the leaders in open-weight models.","disputed":[],"related":[{"id":"2025-01-20-deepseek-r1","url":"https://postcutoff.com/e/2025-01-20-deepseek-r1/","date":"2025-01-20","date_precision":"day","short_title":"DeepSeek-R1: open-weights reasoning model rivals o1 and shakes markets","deck":null,"takeaway":"The 'DeepSeek moment' showed that frontier reasoning could be replicated cheaply and openly, triggering a market shock, a wave of open reasoning models, and US policy debates on China.","category":"open-source","category_label":"Open source","importance":5,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":3,"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["DeepSeek"]}],"people":[],"posts":[],"videos":[],"models":[],"changes":[{"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":null}