Sail Research vs StreamLake

Sail Research discounts open models for background agents. StreamLake is Kuaishou's AI cloud serving its proprietary KAT-Coder models. Open and async versus closed and China-based.

By The Subconscious Team · Updated October 29, 2026

Sail Research vs StreamLake: key differences

Both have a coding angle, but they reach it from opposite ends. StreamLake, the AI cloud brand of Kuaishou, leads with KAT-Coder-Pro V2.5, a proprietary model it says was trained with large-scale agentic RL for repository-level work. It sells per-token access or a KwaiKAT Coding Plan, with a Claude-protocol proxy for Claude Code. Sail Research serves open models like Kimi K2.6 and GLM-5.3 and sells time: a low-latency asap window, a balanced window, or off-peak flex at 55 to 85% below traditional providers.

For Western buyers, residency decides a lot. StreamLake's data sits in China, which complicates US and EU procurement. Sail runs over OpenAI and Anthropic compatible APIs, and its named customers include Detail.dev. On workload, StreamLake fits developers who want a subscription coding model inside their editor, and Chinese businesses that want domestic MaaS and bare metal. Sail fits unattended agents that run for hours and do not need an answer right away. Interactive coding sessions get Sail's smallest discount; that is StreamLake's use case.

What Sail Research and StreamLake do

Sail Research

Sail Research sells throughput over latency. Founders Neil Movva and Samir Menon built a serving stack that packs as much work as possible into every GPU, and customers state how long they can wait through completion windows. Its docs quote each window against traditional providers: the default asap window serves at low latency for 30 to 70% less, balanced for 45 to 80% less, and the off-peak flex window for 55 to 85% less. Batch requests default to flex, and LoRA and custom-tool requests default to balanced.

Example models: Kimi K2.6, GLM-5.3

Full Sail Research 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, and its Vanchin platform also hosts third-party open models from DeepSeek and GLM, most recently DeepSeek V4.1 Flash 1017.

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

Full StreamLake profile

Should you choose Sail Research or StreamLake?

Sail Research

Choose Sail Research for

Unattended code scans and background agents on open models.
Open-model tokens at 30 to 85% off for patient workloads.
Customer LoRA fine-tunes on open weights.

StreamLake

Choose StreamLake for

Interactive agentic coding on a subscription plan.
Using KAT-Coder inside Claude Code through a proxy.
Chinese businesses wanting domestic MaaS and bare metal.

Sail Research vs StreamLake at a glance

Attribute	Sail Research	StreamLake
Model access	Open weights	Proprietary coding models, plus hosted open models
Flagship models	Kimi K2.6, GLM-5.3, GPT-OSS 120B	KAT-Coder-Pro V2.5, KAT-Coder-Air V2.5
Speed	Low-latency default; slower windows cheaper	Unknown
Price	30–85% below other hosts by completion window	$0.74 in, $2.96 out (Pro V2.5), or KwaiKAT Coding Plan
Customization	Customer LoRA fine-tunes	Unknown
Deployment	API plus Sailboxes	MaaS API, bare metal
Long context	Varies by model	256K

Frequently asked questions

What is the difference between Sail Research and StreamLake?

Sail Research discounts open models for background agents. StreamLake is Kuaishou's AI cloud serving its proprietary KAT-Coder models. Open and async versus closed and China-based.

When should I choose Sail Research over StreamLake?

Unattended code scans and background agents on open models; Open-model tokens at 30 to 85% off for patient workloads; Customer LoRA fine-tunes on open weights.

When should I choose StreamLake over Sail Research?

Interactive agentic coding on a subscription plan; Using KAT-Coder inside Claude Code through a proxy; Chinese businesses wanting domestic MaaS and bare metal.

Is Sail Research or StreamLake cheaper?

Sail Research: 30–85% below other hosts by completion window. StreamLake: $0.74 in, $2.96 out (Pro V2.5), or KwaiKAT Coding Plan. The cheaper choice depends on the model and workload.

Which has more context, Sail Research or StreamLake?

Sail Research: Varies by model. StreamLake: 256K.

Related comparisons

Running long-horizon agents?

If your agents run past 200K tokens, compare both against Subconscious. Our inference stack treats a long-horizon trace as the primary workload, so speed, cost, and accuracy hold up deep into the trace.

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