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vLLM-Compatible

vLLM can serve open-source (and some custom) models via an OpenAI-compatible HTTP API. Fased connects through the vllm / openai-completions route. Use this same provider for vLLM, SGLang, TGI, LocalAI, FastChat, and similar OpenAI-compatible local servers. Use Custom Provider only when this shortcut does not match your endpoint. Fased can also auto-discover available models when you opt in with VLLM_API_KEY (any value works if your server does not enforce auth) and you do not define an explicit models.providers.vllm entry.

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Quick start

  1. Start the OpenAI-compatible server.
Your base URL should expose /v1 endpoints such as /v1/models and /v1/chat/completions. Local servers commonly run on:
  • http://127.0.0.1:8000/v1
  1. Opt in (any value works if no auth is configured):
export VLLM_API_KEY="vllm-local"
  1. Select a model (replace with one of your served model IDs):
{
  agents: {
    defaults: {
      model: { primary: "vllm/your-model-id" },
    },
  },
}

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Model discovery (implicit provider)

When VLLM_API_KEY is set (or an auth profile exists) and you do not define models.providers.vllm, Fased will query:
  • GET http://127.0.0.1:8000/v1/models
…and convert the returned IDs into model entries. If you set models.providers.vllm explicitly, auto-discovery is skipped and you must define models manually.

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Explicit configuration (manual models)

Use explicit config when:
  • the server runs on a different host/port.
  • You want to pin contextWindow/maxTokens values.
  • Your server requires a real API key (or you want to control headers).
{
  models: {
    providers: {
      vllm: {
        baseUrl: "http://127.0.0.1:8000/v1",
        apiKey: "${VLLM_API_KEY}",
        api: "openai-completions",
        request: { allowPrivateNetwork: true },
        models: [
          {
            id: "your-model-id",
            name: "Local Served Model",
            reasoning: false,
            input: ["text"],
            cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
            contextWindow: 128000,
            maxTokens: 8192,
          },
        ],
      },
    },
  },
}
request.allowPrivateNetwork: true is required for loopback, LAN, and private VPS endpoints. Public model providers should leave it unset.

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Health And Capabilities

Agent > Models probes this provider when configured. The row can show reachable, auth ok, models discovered, and private network approved. Fased does not assume vision, tools, or reasoning support from a local model ID unless the configured model entry declares it.

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Troubleshooting

  • Check the server is reachable:
curl http://127.0.0.1:8000/v1/models
  • If requests fail with auth errors, set a real VLLM_API_KEY that matches your server configuration, or configure the provider explicitly under models.providers.vllm.