Synthetic
Synthetic exposes Anthropic-compatible endpoints.
OpenClaw registers 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
Obtain a
SYNTHETIC_API_KEYfrom your Synthetic account, or let the onboarding wizard prompt you for one. - Run onboarding
openclaw onboard --auth-choice synthetic-api-key - Verify the default model
After onboarding the default model is set to:
synthetic/hf:MiniMaxAI/MiniMax-M2.5
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-M2.5" },
models: { "synthetic/hf:MiniMaxAI/MiniMax-M2.5": { alias: "MiniMax M2.5" } },
},
},
models: {
mode: "merge",
providers: {
synthetic: {
baseUrl: "https://api.synthetic.new/anthropic",
apiKey: "${SYNTHETIC_API_KEY}",
api: "anthropic-messages",
models: [
{
id: "hf:MiniMaxAI/MiniMax-M2.5",
name: "MiniMax M2.5",
reasoning: false,
input: ["text"],
cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
contextWindow: 192000,
maxTokens: 65536,
},
],
},
},
},
}
Model catalog
All Synthetic models use cost 0 (input/output/cache).
| Model ID | Context window | Max tokens | Reasoning | Input |
|---|---|---|---|---|
hf:MiniMaxAI/MiniMax-M2.5 | 192,000 | 65,536 | no | text |
hf:moonshotai/Kimi-K2-Thinking | 256,000 | 8,192 | yes | text |
hf:zai-org/GLM-4.7 | 198,000 | 128,000 | no | text |
hf:deepseek-ai/DeepSeek-R1-0528 | 128,000 | 8,192 | no | text |
hf:deepseek-ai/DeepSeek-V3-0324 | 128,000 | 8,192 | no | text |
hf:deepseek-ai/DeepSeek-V3.1 | 128,000 | 8,192 | no | text |
hf:deepseek-ai/DeepSeek-V3.1-Terminus | 128,000 | 8,192 | no | text |
hf:deepseek-ai/DeepSeek-V3.2 | 159,000 | 8,192 | no | text |
hf:meta-llama/Llama-3.3-70B-Instruct | 128,000 | 8,192 | no | text |
hf:meta-llama/Llama-4-Maverick-17B-128E-Instruct-FP8 | 524,000 | 8,192 | no | text |
hf:moonshotai/Kimi-K2-Instruct-0905 | 256,000 | 8,192 | no | text |
hf:moonshotai/Kimi-K2.5 | 256,000 | 8,192 | yes | text + image |
hf:openai/gpt-oss-120b | 128,000 | 8,192 | no | text |
hf:Qwen/Qwen3-235B-A22B-Instruct-2507 | 256,000 | 8,192 | no | text |
hf:Qwen/Qwen3-Coder-480B-A35B-Instruct | 256,000 | 8,192 | no | text |
hf:Qwen/Qwen3-VL-235B-A22B-Instruct | 250,000 | 8,192 | no | text + image |
hf:zai-org/GLM-4.5 | 128,000 | 128,000 | no | text |
hf:zai-org/GLM-4.6 | 198,000 | 128,000 | no | text |
hf:zai-org/GLM-5 | 256,000 | 128,000 | yes | text + image |
hf:deepseek-ai/DeepSeek-V3 | 128,000 | 8,192 | no | text |
hf:Qwen/Qwen3-235B-A22B-Thinking-2507 | 256,000 | 8,192 | 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.models), add every
Synthetic model you plan to use. Models not in the allowlist will be hidden
from the agent.
Base URL override
If Synthetic changes its API endpoint, override the base URL in your config:
{
models: {
providers: {
synthetic: {
baseUrl: "https://new-api.synthetic.new/anthropic",
},
},
},
}
Remember that OpenClaw appends /v1 automatically.