Moonshot AI's K3.1 model series — its K3.1 Pro flagship (standard and faster Highspeed tiers) is a 1M-token reasoning model that independent testing ranks top-5, with Artificial Analysis scoring it 55 on its Intelligence Index.
Last verified · 2026-10-25 · by Moe Ameen
Kimi K3.1 is the model series Moonshot AI — the Beijing lab behind the Kimi models — launched in late October 2026, and in practice "Kimi K3.1" means its flagship, Kimi K3.1 Pro. Moonshot describes K3.1 Pro as a post-trained version of its Kimi K3 flagship: the same base model trained with substantially more post-training compute, which it calls its most capable "3T-class" open-weight model. The series ships in two tiers — a standard model (API ID kimi-k3.1-pro) and a Highspeed variant (kimi-k3.1-pro-highspeed) Moonshot says runs roughly 2–3x faster at identical capability, for latency-sensitive use. It is served across kimi.ai, the Kimi apps, Kimi Work, Kimi Code, and the Kimi API.
The reason to pay attention now, rather than at launch, is that independent benchmarking has landed. Artificial Analysis scores Kimi K3.1 Pro 55 on its Intelligence Index and ranks it #4 of 215 models — among the leading models in intelligence — which turns Moonshot's launch framing into third-party evidence. Artificial Analysis also measured the practical trade-offs: around 57.5 output tokens per second on the standard tier (below the field median), roughly 3 seconds to first token, and pricing near $2 per million input tokens and $10 per million output (cached input around $0.20), for a blended cost near $2.11 per Intelligence Index task. Treat Moonshot's own coding and hallucination claims as first-party until those are independently confirmed too.
It keeps K3's headline capabilities: a 1-million-token context window and native multimodal understanding, so images and screenshots are first-class input alongside text. Moonshot gives the scale only as "3T-class"; third-party write-ups and Artificial Analysis put it around 2.8 trillion total parameters with a fraction active per token, so treat the exact count as approximate until the full model card is public. Full open weights are slated to follow the hosted launch, with Moonshot pointing to on or around November 4, 2026.
The honest framing: K3.1 is a now-independently-verified, cheap, long-context reasoning-and-coding engine you prompt for text and analysis. It is not a content studio — it drafts, reasons, codes, and reads images, but it renders no finished video, no branded image, and no scheduled post.
The most useful way to pair Kimi K3.1 with Kompozy is to run it as your content calendar's planning engine and let Kompozy be the factory floor. Because K3.1 is cheap, ranks in the independent top-5, and reads a million tokens at once, it is well suited to volume: dump a quarter of research, a dozen transcripts, and your whole back-catalog into one prompt and have it fan out thirty briefs — angles, hooks, scripts, and section outlines — in a single agentic pass through Kimi Work or the API. That is the planning half done at scale and for a few dollars. What you have at the end of it, though, is thirty text files. Not one captioned vertical short, not one face-locked avatar video, not one brand-exact carousel, and nothing scheduled anywhere.
That is precisely the batch Kompozy is built to swallow. Feed those K3.1 briefs in as sources and Kompozy generates the finished media for the whole calendar across its 18 formats — Persona Shorts and HeyGen avatar video, Clipped Shorts, Carousels and Quote Graphics via brand-exact HyperFrames, Photo Posts, Blog Articles, and Email Newsletters — every output held to one voice by your Persona Brief, reframed to 9:16, 1:1, and 16:9, and queued across nine platforms plus blog and email with Autopilot and a per-post review pipeline. You never operate K3.1 inside Kompozy either: it runs its own managed Claude and OpenAI models for generation. So the division is clean and the cadence is the point — K3.1 plans a month of content fast and cheap; Kompozy turns that month of plans into a month of published, on-brand posts without you touching a timeline.
Kimi K3.1 is Moonshot AI's model series launched in late October 2026, whose flagship is Kimi K3.1 Pro — a post-trained version of Kimi K3 served in a standard tier and a 2–3x-faster Highspeed tier. It keeps a 1-million-token context window and native multimodal input, and is served across kimi.ai, the Kimi apps, Kimi Work, Kimi Code, and the Kimi API. In practice, searching "Kimi K3.1" means K3.1 Pro.
Artificial Analysis scores Kimi K3.1 Pro 55 on its Intelligence Index, ranking it #4 of 215 models — among the leading models in intelligence. It also measured ~57.5 output tokens/second on the standard tier (below median), ~3 seconds to first token, and roughly $2/$10 per million tokens for a ~$2.11 blended cost per Index task. Moonshot's own coding and hallucination claims are separate, first-party figures.
"Kimi K3.1" is the series; Kimi K3.1 Pro is the flagship model in it, offered as a standard tier and a faster Highspeed tier (kimi-k3.1-pro-highspeed, roughly 2–3x faster at about double the price). There is no separate non-Pro base model publicly on offer at the authoring date, so the two names point at the same model in everyday use.
No. K3.1 drafts text and code, reasons over long inputs, and understands images, but it renders no captioned video, brand-consistent images, carousels, or scheduled posts — a top-5 Intelligence Index score doesn't change that. To turn a K3.1 draft into finished, on-brand content, pair it with a content engine like Kompozy, which generates 18 formats and publishes to nine platforms plus blog and email.