Synthetic

Synthetic exposes Anthropic-compatible endpoints. OpenClaw provides it through the official @openclaw/synthetic-provider plugin and uses the Anthropic Messages API.

Getting started

openclaw plugins install @openclaw/synthetic-provideropenclaw gateway restart

openclaw onboard --auth-choice synthetic-api-key

synthetic/hf:MiniMaxAI/MiniMax-M3

Config example

{  env: { vars: { SYNTHETIC_API_KEY: "sk-..." } },  agents: {    defaults: {      model: { primary: "synthetic/hf:MiniMaxAI/MiniMax-M3" },      models: { "synthetic/hf:MiniMaxAI/MiniMax-M3": { alias: "MiniMax M3" } },    },  },  models: {    mode: "merge",    providers: {      synthetic: {        baseUrl: "https://api.synthetic.new/anthropic",        apiKey: "${SYNTHETIC_API_KEY}",        api: "anthropic-messages",        models: [          {            id: "hf:MiniMaxAI/MiniMax-M3",            name: "MiniMax M3",            reasoning: true,            input: ["text", "image"],            cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },            contextWindow: 262144,            maxTokens: 65536,          },        ],      },    },  },}

Model discovery

With a Synthetic credential, OpenClaw discovers current text models from Synthetic's /openai/v1/models API. Inference still uses the Anthropic Messages API. Newly advertised models, including small models and syn: aliases, do not need an OpenClaw catalog update.

The live catalog supplies context and output limits, image input, reasoning, tool support, and usage-based token prices. Those prices are estimates, not a subscription bill. See Synthetic's current model list for availability and its recommended aliases.

Offline catalog generation and unavailable or unusable discovery responses use the bundled seed models. Your selected model is not changed automatically. When you override the inference base URL, OpenClaw skips Synthetic's fixed discovery URL so a proxy credential is not sent to Synthetic.

{  models: {    providers: {      synthetic: {        baseUrl: "https://new-api.synthetic.new/anthropic",      },    },  },}

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