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openclaw/docs/providers/synthetic.md

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---
summary: "Use Synthetic's Anthropic-compatible API in OpenClaw"
read_when:
- You want to use Synthetic as a model provider
- You need a Synthetic API key or base URL setup
title: "Synthetic"
---
[Synthetic](https://synthetic.new) 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
<Steps>
<Step title="Get an API key">
Obtain a `SYNTHETIC_API_KEY` from your Synthetic account, or let the
onboarding wizard prompt you for one.
</Step>
<Step title="Run onboarding">
```bash
openclaw onboard --auth-choice synthetic-api-key
```
</Step>
<Step title="Verify the default model">
After onboarding the default model is set to:
```
synthetic/hf:MiniMaxAI/MiniMax-M2.5
```
</Step>
</Steps>
<Warning>
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`.
</Warning>
## Config example
```json5
{
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,
},
],
},
},
},
}
```
## Built-in 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 |
<Tip>
Model refs use the form `synthetic/<modelId>`. Use
`openclaw models list --provider synthetic` to see all models available on your
account.
</Tip>
<AccordionGroup>
<Accordion title="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.
</Accordion>
<Accordion title="Base URL override">
If Synthetic changes its API endpoint, override the base URL in your config:
```json5
{
models: {
providers: {
synthetic: {
baseUrl: "https://new-api.synthetic.new/anthropic",
},
},
},
}
```
Remember that OpenClaw appends `/v1` automatically.
</Accordion>
</AccordionGroup>
## Related
<CardGroup cols={2}>
<Card title="Model selection" href="/concepts/model-providers" icon="layers">
Provider rules, model refs, and failover behavior.
</Card>
<Card title="Configuration reference" href="/gateway/configuration-reference" icon="gear">
Full config schema including provider settings.
</Card>
<Card title="Synthetic" href="https://synthetic.new" icon="arrow-up-right-from-square">
Synthetic dashboard and API docs.
</Card>
</CardGroup>