Moonshot AI releases Kimi K3, a 2.8-trillion-parameter open model

Moonshot AI released Kimi K3, a 2.8T-parameter model and the most expensive from a Chinese lab so far at $3/$15 per million input/output tokens—matching Claude Sonnet pricing. Self-reported benchmarks mostly beat Claude Opus 4.8 and GPT-5.5 but lose to Claude Fable 5 and GPT-5.6 Sol. On Artificial Analysis's private long-horizon knowledge eval, K3 hit an Elo of 1547, +732 over K2.6, behind only Fable 5. Cost per task is $0.94, close to GPT-5.6 Sol's $1.04 and roughly half of Opus 4.8. Output tokens dropped 21% vs K2.6. The model only offers a 'max' reasoning effort; Simon's pelican-on-a-bike SVG cost 25 cents and burned 13,241 reasoning tokens. Input token count suggests an ~85-token hidden system prompt. Vision works well. Open weights promised by July 27.

Moonshot AI launched Kimi K3, a 2.8T total-parameter model and the largest open-weight release to date. Weights are promised by July 27. It supports 1M-token context and native multimodal input, and is live on Kimi.com, Kimi Code, and the API. Artificial Analysis scored it 57 on the AA Intelligence Index—comparable to Claude Opus 4.8 and GPT-5.5, but still behind Claude Fable 5 and GPT-5.6 Sol. On LMSYS Frontend Code Arena, K3 hit #1 with 1679 points and a 76% win rate, well above Fable 5's 63%. Text Arena placed it at #9, a big jump from K2.6's #38. Moonshot itself flagged a noticeable UX gap versus Fable 5 and GPT-5.6 Sol. AA measured cost at $0.94 per task, with 21% fewer output tokens than K2.6.

Moonshot AI is about to release Kimi K3, reportedly China's largest open-weight model with 2–3 trillion parameters. The FT, citing anonymous sources, says it will match or beat Anthropic's Opus 4.8. Kimi K2 already ranked well on open-source benchmarks; K3 aims to close the gap with closed-source leaders from OpenAI and Anthropic. Moonshot is also raising a new round at a reported $31.5B valuation, after a $2B raise in May. The post doesn't give a specific launch date or benchmark scores, only 'in the coming days.'

Kimi launched Kimi Work on Product Hunt, a desktop agent for knowledge work. It reads local files, automates browsers via WebBridge, runs scheduled tasks, and can spin up to 300 agents in parallel for heavy jobs, outputting PPT, Excel, Word, or PDF. The post doesn't disclose K2.6 model specs or pricing, only mentions a free option.