Synthetic

Synthetic exposes Anthropic-compatible endpoints. OpenClaw bundles it as the synthetic provider and uses the Anthropic Messages API.

Property	Value
Provider	`synthetic`
Auth	`SYNTHETIC_API_KEY`
API	Anthropic Messages
Base URL	`https://api.synthetic.new/anthropic`

Getting started

Get an API key

Get a SYNTHETIC_API_KEY from your Synthetic account, or let onboarding prompt you for one.

Run onboarding

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

Verify the default model

Onboarding sets the default model to:

synthetic/hf:MiniMaxAI/MiniMax-M3

OpenClaw’s Anthropic client appends /v1 to the base URL automatically, so use https://api.synthetic.new/anthropic (not /anthropic/v1). If Synthetic changes its base URL, override models.providers.synthetic.baseUrl.

Config example

{
  env: { 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,
          },
        ],
      },
    },
  },
}

Built-in catalog

All Synthetic models use cost 0 (input/output/cache). See Synthetic’s current model list for service availability.

Model ID	Context window	Max tokens	Reasoning	Input
`hf:MiniMaxAI/MiniMax-M3`	262,144	65,536	yes	text + image
`hf:moonshotai/Kimi-K2.7-Code`	262,144	8,192	yes	text + image
`hf:nvidia/NVIDIA-Nemotron-3-Super-120B-A12B-NVFP4`	262,144	8,192	yes	text
`hf:openai/gpt-oss-120b`	131,072	8,192	yes	text
`hf:Qwen/Qwen3.6-27B`	262,144	81,920	yes	text + image
`hf:zai-org/GLM-4.7-Flash`	196,608	131,072	yes	text
`hf:zai-org/GLM-5.2`	524,288	131,072	yes	text

Model refs use the form synthetic/<modelId>. Use openclaw models list --provider synthetic to see all models available on your account.

Model allowlist

If you enable a model allowlist (agents.defaults.modelPolicy.allow), add every Synthetic model you plan to use. Models not in the allowlist are hidden from the agent.

Base URL override

If Synthetic changes its API endpoint, override the base URL:

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

OpenClaw still appends /v1 automatically.

Model providers

Provider rules, model refs, and failover behavior.

Configuration reference

Full config schema including provider settings.

Synthetic dashboard and API docs.

Overview

Concepts and configuration

Providers

Synthetic

Getting started

Config example

Built-in catalog

Model providers

Configuration reference

Synthetic

​Getting started

​Config example

​Built-in catalog

​Related

Model providers

Configuration reference

Synthetic

Getting started

Config example

Built-in catalog

Related