Skip to content
AnyRouter
All use cases

DeepSeek HarnessCoding agents

Run DeepSeek Harness on AnyRouter

Add AnyRouter to DeepSeek Harness as a custom model API. One base URL and one sk-ar- key bring the anyrouter/* router models into the picker.

Short linkanyrouter.dev/u/deepseek-harness

Set it up

Settings → Models → Custom model API
Provider ID:   anyrouter
Base URL:      https://anyrouter.dev/api/v1
API protocol:  OpenAI Chat Completions
API key:       your sk-ar- key
Models:        anyrouter/coding, anyrouter/agent, anyrouter/hermes, anyrouter/auto
  1. 1.Create an AnyRouter key at anyrouter.dev/keys. It starts with sk-ar-.
  2. 2.In Harness, open Settings, then Models, choose Add model provider, and switch to the Custom model API tab.
  3. 3.Set Provider ID to anyrouter, Base URL to https://anyrouter.dev/api/v1, API protocol to OpenAI Chat Completions, and paste the key. Harness uses the Provider ID in saved sessions, so you cannot rename it later.
  4. 4.Choose Fetch available models and tick the anyrouter/* models you want. anyrouter/byok, anyrouter/coding and anyrouter/agent appear only after you add a provider key at /byok. If the fetch lists nothing, type the ids by hand.
  5. 5.Pick a model in the composer. Use anyrouter/coding if you have your own provider keys, and anyrouter/hermes if you do not. Both route only to models that can call tools.
Read the DeepSeek Harness guideAdd BYOK keysModelsStart free
Why use this

DeepSeek Harness is an open-source agent app from DeepSeek, in preview. Its built-in providers each need their own key. A custom model API lets one gateway key serve every model, with fallback when an upstream fails.

Other ways to set it up
cordis.patch.yml (Open configuration file)
- id: llm-pi-ai
  config:
    providers:
      anyrouter:
        apiKeyEnv: ANYROUTER_API_KEY
        api: openai-completions
        baseURL: https://anyrouter.dev/api/v1
        models:
          - id: anyrouter/coding
          - id: anyrouter/agent
          - id: anyrouter/hermes
          - id: anyrouter/auto
Anthropic Messages (a second provider)
Provider ID:   anyrouter-messages
Base URL:      https://anyrouter.dev/api
API protocol:  Anthropic Messages
API key:       your sk-ar- key
Endpoints and key
OpenAI-compatible
https://anyrouter.dev/api/v1
Anthropic-compatible
https://anyrouter.dev/api
Key
ANYROUTER_API_KEY (sk-ar-…)

Using your own provider keys? Add each one once, then call anyrouter/byok. Bring your keys →

What you will see
DeepSeek Harness Settings, Models, Custom model API tab. Provider ID is anyrouter, Base URL is https://anyrouter.dev/api/v1, API protocol is OpenAI Chat Completions and the API key is masked. The model list shows anyrouter/byok, anyrouter/coding, anyrouter/agent and anyrouter/hermes.
Settings → Models → Custom model API, after Fetch available models.
The DeepSeek Harness model picker under the anyrouter provider, listing AnyRouter BYOK, Coding, Agent, Hermes, Cowork, Free, Auto (checked), Decision and Latest, above a composer set to Full access and AnyRouter Auto.
The AnyRouter router models in the Harness picker, on an account with provider keys.
Good to know
  • anyrouter/coding, anyrouter/agent and anyrouter/byok route only across your own provider keys, so your provider bills you and AnyRouter takes no credits. Add keys once at /byok.
  • anyrouter/hermes and anyrouter/cowork bill AnyRouter credits at each model's rate. anyrouter/auto mixes free and paid hops. A request that carries tools routes only to models that accept them.
  • Harness replaces the whole entry config when it applies an override. Keep your other providers in the llm-pi-ai block when you edit cordis.patch.yml.
  • For Anthropic Messages, add a second provider with Base URL https://anyrouter.dev/api and no /v1. Harness gives each provider one protocol.
Limits
  • With no provider keys saved, anyrouter/coding, anyrouter/agent and anyrouter/byok have nothing to route to.
  • anyrouter/decision is for the Decisions API, not chat. Do not pick it for a Harness session.
  • DeepSeek Harness is a preview, and DeepSeek warns of compatibility-breaking changes. Its settings screens may change.

Links

Related