{"slug": "introducing-kimi-k3-1-pro", "title": "Introducing Kimi K3.1 Pro", "summary": "Moonshot released Kimi K3.1 Pro, a soon-to-be open-weight model that Artificial Analysis scored at 55, ahead of Claude Fable 5.1, GPT-6 Astra and Gemini 4 Argon (all 53) and behind only Claude Opus 5.5 (58). Kimi K3.1 Pro is priced at $2.00 per million input tokens and $10.00 per million output tokens, the same as GPT-6.1 Sol and half the price of Claude Opus 5.5, with a \"Highspeed\" version running 2-3x faster at twice the price except for input token cache hits. Simon Willison tested Kimi K3.1 Pro through the Moonshot API using the `llm openai endpoint` command added to LLM 0.32, generating pelican-riding-a-bicycle SVGs at the low, medium and max reasoning levels and comparing them against fresh runs on Kimi K3.", "body_md": "They're also offering a \"Highspeed\" version that's 2-3x faster, at twice the price (except for input token cache hits, which are priced the same).\n\nThe [US dollar pricing](https://platform.kimi.ai/docs/pricing/chat) is $2.00/million tokens for input and $10/million for output - the same as GPT-6.1 Sol and half the price of Claude Opus 5.5.\n\nMoonshot's own benchmarks show Kimi as approximately level with Opus 5.5 and GPT-6 Astra - beating them on a few benchmarks, coming close on others.\n\nArtificial Analysis [scored Kimi at 55](https://artificialanalysis.ai/models/kimi-k3-1-pro) - ahead of Claude Fable 5.1, GPT-6 Astra, and Gemini 4 Argon (all at 53) and behind only Claude Opus 5.5 (58).\n\nThis is the first time a (soon-to-be) open weight model has scored this highly against the frontier.\n\nI tried it out via the [Moonshot API](https://platform.kimi.ai/docs/get-your-api-key) using the [llm openai endpoint](https://llm.datasette.io/en/stable/other-models.html#openai-endpoint) command I added to [LLM 0.32](https://llm.datasette.io/en/stable/changelog.html#v0-32) back in August:\n\n```\nllm openai endpoint \\\n  https://api.moonshot.ai/v1 \\\n  --key kimi \\\n  -m kimi-k3.1-pro \\\n  \"Generate an SVG of a pelican riding a bicycle\" \\\n  --responses \\\n  -o reasoning_effort low \\\n  > kimi-k3.1-pro-pelican-low.stdout.txt \\\n  2> kimi-k3.1-pro-pelican-low.stderr.txt\n```\n\n`llm openai endpoint` can run prompts against any OpenAI-compatible endpoint but doesn't log the results, hence the extra options to save stdout and stderr (the reasoning trace).\n\nHere [are the pelicans](https://tools.simonwillison.net/markdown-svg-renderer?url=https%3A%2F%2Fgist.github.com%2Fsimonw%2F9b7181492209387da1d4f53002f26663) I got for Kimi K3.1 Pro on the three reasoning levels it supports -  low, medium, and max. This is max:\n\nFor comparison, I ran fresh [pelicans against Kimi K3](https://tools.simonwillison.net/markdown-svg-renderer?url=https%3A%2F%2Fgist.github.com%2Fsimonw%2Feba9a4283c9e94cbbb5325902a3921a8) on those three reasoning levels.\n    \n\nVia [Hacker News](https://news.ycombinator.com/item?id=50212065)\n\nTags: [ai](https://simonwillison.net/tags/ai), [generative-ai](https://simonwillison.net/tags/generative-ai), [llms](https://simonwillison.net/tags/llms), [llm](https://simonwillison.net/tags/llm), [llm-pricing](https://simonwillison.net/tags/llm-pricing), [pelican-riding-a-bicycle](https://simonwillison.net/tags/pelican-riding-a-bicycle), [llm-release](https://simonwillison.net/tags/llm-release), [ai-in-china](https://simonwillison.net/tags/ai-in-china), [moonshot](https://simonwillison.net/tags/moonshot), [kimi](https://simonwillison.net/tags/kimi)", "url": "https://wpnews.pro/news/introducing-kimi-k3-1-pro", "canonical_source": "https://simonwillison.net/2026/Oct/23/kimi-k31-pro/", "published_at": "2026-10-23 19:40:54+00:00", "updated_at": "2026-10-23 20:11:57.956502+00:00", "lang": "en", "topics": ["large-language-models", "generative-ai", "ai-research", "ai-products"], "entities": ["Moonshot", "Kimi K3.1 Pro", "Artificial Analysis", "Claude Opus 5.5", "GPT-6 Astra", "Gemini 4 Argon", "Simon Willison", "LLM 0.32"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/introducing-kimi-k3-1-pro", "markdown": "https://wpnews.pro/news/introducing-kimi-k3-1-pro.md", "text": "https://wpnews.pro/news/introducing-kimi-k3-1-pro.txt", "jsonld": "https://wpnews.pro/news/introducing-kimi-k3-1-pro.jsonld"}}