OpenRouter

One key, every provider; the model id names the provider. Failover across providers is OpenRouter's; the chain's failover is Marg's — use either or both.

bash

LLM_CHAIN=openrouter,anthropic   # failover to a second endpoint is one more name
LLM_OPENROUTER_API_KEY=sk-or-…
LLM_OPENROUTER_MODEL=anthropic/claude-sonnet-4.5

Every endpoint takes the same knobs: LLM_<NAME>_TEMPERATURE (none omits it), LLM_<NAME>_BODY (JSON merged into every request), LLM_<NAME>_PRICE (input,cached,output per million, for the cost ledger), LLM_<NAME>_NOTES (a per-model notes file). Two models of one provider: LLM_FAST_PRESET=openrouter under another name. Environment has the full list.

Check it: npm run gateway, then curl localhost:8787/api/health — the llm.chain entry shows the endpoint, whether its key is set, and its state.

Provider docs: https://openrouter.ai/docs

Source: docs/providers/openrouter.md — edit it there; the site mirrors the repository.

OpenRouter ​

OpenRouter