> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mixroute.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Fix OpenClaw Invalid Beta Flag Error

> Complete guide to diagnose and fix the invalid beta flag error when using OpenClaw with MixRoute API

> When using OpenClaw to access Claude models through MixRoute API, you may encounter the "invalid beta flag" error. This guide provides complete diagnosis and fix solutions.

## Problem Overview

### Error Symptoms

The "invalid beta flag" error may manifest in several ways, but the crucial evidence is always in the Gateway logs and the resolved provider route. Your OpenClaw assistant may return:

* **Blank responses**: No content returned
* **Generic upstream 400 errors**: HTTP 400 status code
* **Provider-specific validation messages**: Detailed error information from the provider

### Error Format

<CodeGroup>
  ```json Error Response theme={null}
  {
    "type": "error",
    "error": {
      "type": "invalid_request_error",
      "message": "invalid beta flag"
    }
  }
  ```

  ```bash AWS Bedrock Error theme={null}
  ValidationException: invalid beta flag
  ```

  ```bash Google Vertex Error theme={null}
  400 Bad Request: invalid beta flag
  ```
</CodeGroup>

<Info>
  This error means the upstream Claude-compatible route rejected an Anthropic beta header. The current fix is not to blindly add `"beta_features": []`.
</Info>

## Diagnosis Methods

### Quick Diagnosis Commands

Run the following command sequence to diagnose the problem:

```bash theme={null}
openclaw logs --follow
openclaw models status
openclaw config validate
openclaw gateway status
openclaw doctor
```

<Warning>
  Do not classify the problem from the chat surface alone. Use `openclaw logs --follow`, `openclaw models status`, and the active model ref to classify the error.
</Warning>

### Error Classification

<Tabs>
  <Tab title="By Route Type">
    | Route Type                    | Error Symptoms             | Check Items                         |
    | ----------------------------- | -------------------------- | ----------------------------------- |
    | Direct Anthropic + 1M context | Long context request fails | `params.context1m` configuration    |
    | Amazon Bedrock                | AWS validation error       | provider shape, region, credentials |
    | Custom proxy                  | header rejection           | `models.providers.<id>.headers`     |
    | Stale OpenClaw build          | compatibility issues       | `openclaw --version`                |
    | Invalid config                | configuration damage       | `openclaw config validate`          |
  </Tab>

  <Tab title="By Error Cause">
    **Failure Branch Analysis:**

    | Branch                                 | Failure Reason                                                             | Check Item                                       | Best Fix                                        |
    | -------------------------------------- | -------------------------------------------------------------------------- | ------------------------------------------------ | ----------------------------------------------- |
    | Direct Anthropic + 1M context          | `params.context1m: true` maps to Anthropic beta header                     | `agents.defaults.models["anthropic/..."].params` | Disable `context1m` or use eligible credentials |
    | Bedrock route shaped like Anthropic    | Bedrock uses AWS auth and Converse streaming, not direct Anthropic headers | `models.providers`, region, AWS env/profile      | Use `amazon-bedrock` provider shape             |
    | Custom proxy with explicit beta header | Proxy rejects unsupported `anthropic-beta`                                 | `models.providers.<id>.headers`                  | Remove or narrow the header                     |
    | Stale OpenClaw build                   | Old provider behavior forwards headers current builds suppress             | `openclaw --version`, `openclaw doctor`          | Update and rerun doctor                         |
    | Invalid config after manual edit       | Gateway loaded a partial or clobbered provider entry                       | `openclaw config validate`, `.rejected.*` files  | Repair with `doctor --fix`                      |
  </Tab>
</Tabs>

## Fix Solutions

### Solution Selection Guide

<CardGroup cols={2}>
  <Card title="Custom Proxy" icon="server">
    Using custom proxy or relay service
  </Card>

  <Card title="Direct Anthropic" icon="bolt">
    Using Anthropic API directly
  </Card>

  <Card title="Amazon Bedrock" icon="aws">
    Using AWS Bedrock service
  </Card>

  <Card title="Google Vertex" icon="google">
    Using Google Vertex AI
  </Card>
</CardGroup>

<Info>
  Choosing the appropriate fix depends on which provider route you actually need. Do not move to a different provider just to silence the error unless that route also solves your access, compliance, or cost requirement.
</Info>

### Detailed Fix Steps

#### Solution 1: Custom Proxy or Relay Fix

Keep the proxy, but stop pretending it is native Anthropic unless it is. Use an explicit provider id, set the correct API shape, and remove unsupported beta headers.

<Accordion title="Custom Proxy Configuration Example">
  ```json theme={null}
  {
    "models": {
      "providers": {
        "relay": {
          "baseUrl": "https://relay.example.com",
          "api": "anthropic-messages",
          "apiKey": "${RELAY_API_KEY}",
          "models": [
            {
              "id": "claude-opus-4-6",
              "name": "Claude Opus 4.6 via relay",
              "contextWindow": 200000,
              "maxTokens": 8192
            }
          ]
        }
      }
    },
    "agents": {
      "defaults": {
        "model": { "primary": "relay/claude-opus-4-6" }
      }
    }
  }
  ```
</Accordion>

**Checklist:**

* Confirm the API shape supported by the proxy
* Remove unsupported `anthropic-beta` header
* Verify model id matches provider configuration

#### Solution 2: Direct Anthropic Long-context Fix

If you intentionally need 1M context, use direct Anthropic and confirm your credential is eligible. If you only enabled it because an old guide told you to, remove it.

<Accordion title="Direct Anthropic Configuration Example">
  ```json theme={null}
  {
    "agents": {
      "defaults": {
        "models": {
          "anthropic/claude-opus-4-6": {
            "params": { "context1m": false }
          }
        }
      }
    }
  }
  ```
</Accordion>

**Checklist:**

* Confirm whether you really need 1M context
* Check if credentials support long-context beta
* Verify model eligibility

#### Solution 3: Amazon Bedrock Fix

Use the Bedrock provider, not a direct Anthropic provider with AWS credentials pasted into the wrong place.

<Accordion title="Bedrock Configuration Checklist">
  **Key Check Items:**

  * `AWS_REGION` or `AWS_DEFAULT_REGION` environment variables
  * AWS credential chain availability
  * Model access permissions in the target region
  * Discovery permissions: `bedrock:ListFoundationModels`, `bedrock:ListInferenceProfiles`

  <Warning>
    Do not use an Anthropic API key in the model provider config. Bedrock auth uses AWS credentials, region, and permissions (such as model invoke/list access).
  </Warning>
</Accordion>

#### Solution 4: Google Vertex or Gemini-style Routes Fix

Keep the Google-owned auth flow and model route separate from direct Anthropic assumptions.

<Accordion title="Vertex AI Fix Steps">
  1. Keep Google authentication flow
  2. Remove explicit beta header
  3. Verify active provider route:
     ```bash theme={null}
     openclaw models status
     ```
  4. Confirm model id matches provider route
</Accordion>

#### Solution 5: Configuration Damage or Old Install Fix

When the error appears after an update or hand edit, assume the config may be stale or partially clobbered.

<Accordion title="Configuration Diagnosis Commands">
  ```bash theme={null}
  openclaw --version
  openclaw config validate
  openclaw doctor
  openclaw gateway status --deep
  ```

  <Warning>
    If validation fails, do not copy a tiny replacement JSON object over the whole config. Use `openclaw config set`, `config.patch`, or `openclaw doctor --fix` so the active file keeps required metadata, Gateway mode, auth, and provider shape.
  </Warning>
</Accordion>

### Quick Fix Steps

<Steps>
  <Step title="Custom Anthropic-compatible proxy">
    Inspect your `models.providers` entry and remove any hard-coded beta header unless your proxy explicitly supports it:

    ```json theme={null}
    {
      "models": {
        "providers": {
          "my-proxy": {
            "api": "anthropic-messages",
            "baseUrl": "https://proxy.example.com",
            "headers": {
              "anthropic-beta": "REMOVE_THIS_UNLESS_SUPPORTED"
            }
          }
        }
      }
    }
    ```
  </Step>

  <Step title="Direct Anthropic 1M context">
    Disable the beta unless you know the credential is eligible:

    ```json theme={null}
    {
      "agents": {
        "defaults": {
          "models": {
            "anthropic/claude-opus-4-6": {
              "params": {
                "context1m": false
              }
            }
          }
        }
      }
    }
    ```
  </Step>

  <Step title="Bedrock">
    Move to the dedicated provider shape instead of Anthropic-compatible header tweaks. Bedrock auth uses AWS credentials, region, and permissions (such as model invoke/list access); it does not need an Anthropic API key in the model provider config.
  </Step>
</Steps>

**After each change, run:**

```bash theme={null}
openclaw config validate
openclaw gateway restart
openclaw logs --follow
```

## Prevention

### Best Practices

<Steps>
  <Step title="Plan your provider route">
    Before installation, decide whether you need direct Anthropic behavior, AWS/GCP controls, a regional proxy, or a local model. Do not copy a model id without copying the route assumptions that make it work.
  </Step>

  <Step title="Use built-in providers">
    Use `openclaw onboard` and provider docs first. Built-in providers own their auth and model picker behavior. Custom `models.providers` entries are for overrides, local runtimes, and proxies, not a replacement for every supported provider.
  </Step>

  <Step title="Validate before going live">
    After configuration, run:

    ```bash theme={null}
    openclaw config validate
    openclaw doctor
    openclaw gateway status
    ```

    Send one test message through the Control UI before testing every connected channel.
  </Step>

  <Step title="Document the route owner">
    Record which provider owns auth, rate limits, region, model discovery, and beta behavior. This prevents future teammates from adding a direct Anthropic header to a Bedrock or proxy route.
  </Step>

  <Step title="Stay updated">
    OpenClaw provider behavior, Bedrock model discovery, Vertex support, and Anthropic beta eligibility can change. Recheck provider docs before re-enabling headers or long-context options.
  </Step>
</Steps>

<Info>
  For teams deploying OpenClaw at scale, encode the provider route and allowed headers in configuration management. The enforcement target is no longer "always add a beta feature disable flag"; it is "do not let unsupported beta headers reach non-native routes."
</Info>

### Verification Checklist

<Check>
  Confirm the provider route type (direct Anthropic, Bedrock, Vertex, or custom proxy)
</Check>

<Check>
  Run `openclaw config validate` to confirm configuration is valid
</Check>

<Check>
  Check `openclaw gateway status` to confirm Gateway is running normally
</Check>

<Check>
  Check `models.providers.<id>.headers` for unsupported beta headers
</Check>

<Check>
  Confirm `openclaw --version` is the latest version
</Check>

## FAQ

<Accordion title="Applied the fix but still see the error?">
  First check the active model ref and provider route. A fix applied to `anthropic/...` will not affect a `relay/...` or `amazon-bedrock/...` route. Then run `openclaw config validate` and inspect `models.providers.<id>.headers` for explicit `anthropic-beta`.
</Accordion>

<Accordion title="Error appeared after an OpenClaw update?">
  Updates can tighten provider safety behavior or reject config shapes that older builds tolerated. Check `openclaw --version`, run `openclaw doctor`, and compare your active provider entry with the current provider docs.
</Accordion>

<Accordion title="Can I use some beta features but not others?">
  Only on routes that support the corresponding header. In current OpenClaw, the clearest published example is Anthropic 1M context: set `params.context1m: true` on supported Anthropic Opus/Sonnet models only when the credential is eligible. For proxy or managed routes, do not add beta headers unless that route's docs explicitly support them.
</Accordion>

<Accordion title="Why does my friend's setup work without these changes?">
  They may be using a different provider route, a newer OpenClaw build, or a proxy that strips unsupported headers before forwarding. Compare the active model ref and provider config, not only the model name.
</Accordion>

<Accordion title="Is this a bug in OpenClaw or the SDK?">
  It is usually configuration alignment, not one universal bug. OpenClaw can route to native providers, managed cloud providers, and custom proxies. The same visible error can be caused by unsupported headers, stale builds, damaged config, or an ineligible long-context credential.
</Accordion>

<Accordion title="Will this issue be fixed in future versions?">
  Some of it already changed: current OpenClaw suppresses implicit Anthropic beta headers on non-direct Anthropic-compatible endpoints. The remaining failures usually come from explicit headers, old installs, or provider-specific eligibility. Keep OpenClaw updated, but still validate custom headers yourself.
</Accordion>

<Accordion title="How do I know if I'm using a beta feature without realizing it?">
  Search your config for `anthropic-beta`, `context1m`, and provider-specific params under `agents.defaults.models`. Then inspect the resolved model route with `openclaw models status`. A beta feature only matters if it is attached to the route actually handling the request.
</Accordion>

## Related Resources

### MixRoute Documentation

<CardGroup cols={2}>
  <Card title="OpenClaw Integration Guide" icon="plug" href="/en/integrations/openclaw">
    Learn how to integrate MixRoute API into OpenClaw
  </Card>

  <Card title="API Reference" icon="book" href="https://console.mixroute.ai/models">
    View complete API documentation and developer guide
  </Card>

  <Card title="Quick Start" icon="rocket" href="/en/quickstart">
    Get started with MixRoute API in three simple steps
  </Card>

  <Card title="Error Code Reference" icon="exclamation-triangle" href="/en/faq/error-code">
    View all API error codes and solutions
  </Card>
</CardGroup>

### OpenClaw Resources

<CardGroup cols={2}>
  <Card title="OpenClaw Documentation" icon="book" href="https://docs.openclaw.ai">
    OpenClaw official documentation
  </Card>

  <Card title="GitHub Repository" icon="github" href="https://github.com/openclaw/openclaw">
    OpenClaw source code and issue tracking
  </Card>

  <Card title="Community Discussions" icon="comments" href="https://github.com/openclaw/openclaw/discussions">
    Get community support and share experiences
  </Card>

  <Card title="Changelog" icon="history" href="https://github.com/openclaw/openclaw/releases">
    View latest version updates
  </Card>
</CardGroup>

***

<Tip>
  If you encounter other issues while using MixRoute API, please check our [Error Code Reference](/en/faq/error-code) or [Contact Us](/en/contact) for technical support.
</Tip>