# Subconscious vs StreamLake

> StreamLake sells Kuaishou's proprietary KAT-Coder with China data residency. Subconscious serves open models for long coding agents, with no prompt logging and on-prem options.

Canonical: https://www.subconscious.dev/compare/subconscious-vs-streamlake · By The Subconscious Team · Updated September 30, 2026

## How they compare

Both pitch long agentic coding inside Claude Code, so the difference comes down to model and runtime. StreamLake sells KAT-Coder-Pro V2.5, a proprietary model that Kuaishou's KwaiKAT team trained with large-scale agentic reinforcement learning for repository work: reading an issue, changing multiple files, running tests and fixing its own errors over long runs. Developers pay per token or buy a KwaiKAT Coding Plan. Subconscious serves open GLM 5.3 and DeepSeek V4.1 Flash and puts its effort into the runtime, pruning the KV cache, delivering 2x faster task completion and a 5M+ effective context window, and billing processed tokens rather than tokens sent.

Procurement is the bigger split for Western teams. StreamLake's pricing and much of its documentation lead with China and yuan, and data residency in China rules it out for many US and EU enterprises. Subconscious is an MIT CSAIL spinout in Kendall Square, records no prompts or inputs, and offers on-prem deployment. StreamLake makes sense for Chinese internet businesses that want domestic MaaS and bare-metal capacity, or for developers who specifically want KAT-Coder on a subscription. For long coding agents at US or EU companies, Subconscious is the easier fit.

## What each one does

### Subconscious

Subconscious is an MIT CSAIL spinout in Kendall Square that builds inference for long-horizon agents, the workloads where a single trace runs past 200K tokens and often into the millions. Its runtime drops in as a replacement for vLLM or SGLang. Instead of rereading an ever-growing context on every step, it prunes the KV cache and preserves suffix state, and Subconscious co-designs the runtime with post-trained model variants it calls Marathon. Against open models on standard inference, Subconscious delivers 2x faster task completion, delivers a 5M+ effective context window, cuts cost 50% and up to 80%, and scores neutral to 10% better on agentic benchmarks.

### 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.

## Which is best, and when

### Choose Subconscious for

- US and EU teams that cannot keep data in China
- Open-model coding agents past 200K tokens
- Claude Code, Cursor or Copilot backends billed on processed tokens

### Choose StreamLake for

- Developers who want KAT-Coder on a subscription plan
- Chinese businesses needing domestic MaaS and bare metal
- A proprietary model trained with agentic RL for repo work

## At a glance

| Attribute | Subconscious | StreamLake |
|---|---|---|
| Model access | Open weights | Proprietary coding models |
| Flagship models | GLM 5.3, DeepSeek V4.1 Flash | KAT-Coder-Pro V2.5, KAT-Coder-Air |
| Speed | 2x faster task completion | - |
| Price | 50–80% lower cost; billed on processed tokens | Per token or KwaiKAT Coding Plan |
| Customization | Marathon post-trained variants | - |
| Deployment | Managed API, dedicated, on-prem | MaaS API, bare metal |
| Long context | 5M+ effective context | - |

## FAQ

### What is the difference between Subconscious and StreamLake?

StreamLake sells Kuaishou's proprietary KAT-Coder with China data residency. Subconscious serves open models for long coding agents, with no prompt logging and on-prem options.

### When should I choose Subconscious over StreamLake?

US and EU teams that cannot keep data in China; Open-model coding agents past 200K tokens; Claude Code, Cursor or Copilot backends billed on processed tokens.

### When should I choose StreamLake over Subconscious?

Developers who want KAT-Coder on a subscription plan; Chinese businesses needing domestic MaaS and bare metal; A proprietary model trained with agentic RL for repo work.

### Is Subconscious or StreamLake cheaper?

Subconscious: 50–80% lower cost; billed on processed tokens. StreamLake: Per token or KwaiKAT Coding Plan. The cheaper choice depends on the model and workload.

## Try Subconscious

Subconscious speaks the OpenAI and Anthropic API formats. Base URL: https://api.subconscious.dev/v1. Docs: https://docs.subconscious.dev. Get an API key: https://platform.subconscious.dev/signin. Agent guide: https://www.subconscious.dev/agents.md.

Full profiles: [Subconscious](https://www.subconscious.dev/providers/subconscious.md), [StreamLake](https://www.subconscious.dev/providers/streamlake.md).