Moonshot AI vs StreamLake

Two Chinese coding contenders. Kimi K3 is open-weight with independent benchmark results; StreamLake's KAT-Coder is proprietary and sold on a subscription.

By The Subconscious Team · Updated September 30, 2026

Moonshot AI vs StreamLake: key differences

Moonshot and StreamLake both pitch agentic coding, with different models and terms. Kimi K3 is open-weight, with a 1M window and independent results that include 93.4% on SWE-bench Verified from Vals AI and third place on the Artificial Analysis Intelligence Index. StreamLake's KAT-Coder-Pro V2.5 is proprietary, trained by Kuaishou's KwaiKAT team with large-scale agentic reinforcement learning for repository-level work, and its listing relies on StreamLake's own description rather than independent scores. K3 costs $3 in and $15 out. KAT-Coder comes per token or on the KwaiKAT Coding Plan.

The tooling paths differ. StreamLake offers OpenAI-protocol endpoints and a Claude-protocol proxy that drops into Claude Code or OpenClaw. Moonshot offers an OpenAI-compatible endpoint, Kimi Code in the terminal, OpenRouter and Cloudflare Workers AI. StreamLake's pricing and docs lead with China and yuan, and its data residency in China rules it out for many US and EU buyers. Moonshot's hurdles are K3's speed, around 33 tokens per second, and the capacity limits seen at launch. Open weights also give K3 users an exit path that KAT-Coder does not.

What Moonshot AI and StreamLake do

Moonshot AI

Moonshot AI is the Beijing lab behind the Kimi models. Its flagship Kimi K3 launched July 16, 2026 as a 2.8 trillion parameter mixture-of-experts model that activates 16 of 896 experts per token, with native vision and a 1M token context. It is the first open model in the 3T class, and full weights landed on Hugging Face on July 27. The hosted API costs $3 in and $15 out per million tokens, with cached input at $0.30, and it runs through an OpenAI-compatible endpoint, Kimi Code in the terminal, OpenRouter and Cloudflare Workers AI.

Example models: Kimi K3, Kimi K2.6

Full Moonshot AI profile

StreamLake

StreamLake is the AI cloud brand of Kuaishou, the Chinese short-video company behind the Kling video models. It sells model-as-a-service inference and bare-metal compute to internet businesses, drawing on the infrastructure Kuaishou built to serve video at massive scale. Its developer site offers APIs, SDKs and integration guides aimed at taking teams from testing to production.

Example models: KAT-Coder-Pro V2.5, KAT-Coder-Air

Full StreamLake profile

Should you choose Moonshot AI or StreamLake?

Moonshot AI

Choose Moonshot AI for

Teams that want open weights they can self-host later
Benchmark-backed coding quality on hard tasks
Distribution through OpenRouter and Cloudflare Workers AI

StreamLake

Choose StreamLake for

Subscription pricing for heavy KAT-Coder use
Running KAT-Coder inside Claude Code through its proxy
Buyers in China who also want bare-metal capacity

Moonshot AI vs StreamLake at a glance

Attribute	Moonshot AI	StreamLake
Model access	Open weights, custom license	Proprietary coding models
Flagship models	Kimi K3, Kimi K2.6	KAT-Coder-Pro V2.5, KAT-Coder-Air
Speed	~33 tok/s on Kimi K3	Unknown
Price	$3 in, $15 out (Kimi K3)	Per token or KwaiKAT Coding Plan
Customization	Open weights to fine-tune	Unknown
Deployment	API, Kimi Code, OpenRouter	MaaS API, bare metal
Long context	1M	Unknown

Frequently asked questions

What is the difference between Moonshot AI and StreamLake?

Two Chinese coding contenders. Kimi K3 is open-weight with independent benchmark results; StreamLake's KAT-Coder is proprietary and sold on a subscription.

When should I choose Moonshot AI over StreamLake?

Teams that want open weights they can self-host later; Benchmark-backed coding quality on hard tasks; Distribution through OpenRouter and Cloudflare Workers AI.

When should I choose StreamLake over Moonshot AI?

Subscription pricing for heavy KAT-Coder use; Running KAT-Coder inside Claude Code through its proxy; Buyers in China who also want bare-metal capacity.

Is Moonshot AI or StreamLake cheaper?

Moonshot AI: $3 in, $15 out (Kimi K3). StreamLake: Per token or KwaiKAT Coding Plan. The cheaper choice depends on the model and workload.

Related comparisons

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