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“Model Not Supported” (400 Error)

Why this happens: The model you’re trying to use hasn’t been enabled for your organization or tool setup. How to fix:
1

Log in to the dashboard

Go to your Unbound dashboard.
2

Open the Models page

Click Models in the left sidebar.
3

Check model availability

Verify the model you want is listed and available for your organization.
4

Contact your admin

If the model is listed but you still get the error, contact your organization administrator — they may need to enable it in your configuration.
Only organization administrators can enable or disable models. If you’re a regular member, ask your admin to make changes.

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How to Switch Models

Different tools have different model switching mechanisms:
  • Unbound Chat — Use the model selector dropdown at the top of the chat interface
  • Claude Code CLI — The model is determined by your Unbound configuration. To request a different default model, contact your admin
  • Roo Code — Open Roo Code Settings (Ctrl/Cmd + Shift + P → “Roo Code: Open Settings”) and select a different model from the dropdown
  • Cursor — Model selection is configured within Cursor’s AI settings panel

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Requesting New Models (e.g., Opus 4.6, GPT-5)

New models must be:
  1. Added to Unbound’s platform by the Unbound team (if not yet supported)
  2. Enabled for your organization by your admin
If a model you need isn’t available in the Models page:
  • Contact support to check if it’s on the roadmap
  • If it’s a recently released model, it may take a few days to be added

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Token Limit Exceeded Errors

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”Claude’s Response Exceeded the Output Token Maximum”

This error occurs when Claude generates a response larger than the configured maximum output tokens.

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Fix for Claude Code CLI Users

Set the environment variable to increase the limit: 
export CLAUDE_CODE_MAX_OUTPUT_TOKENS=64000
Add this to your shell profile (~/.bashrc or ~/.zshrc) and restart your terminal.

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Fix for API Users

Include the max_tokens parameter in your API request with a higher value: 
response = client.messages.create(
    model="claude-opus-4-5-20250514",
    max_tokens=8192,  # Increase this value
    messages=[{"role": "user", "content": "Your prompt"}]
)

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General Tips to Avoid Token Limits

  • Break large tasks into smaller prompts — instead of “rewrite the entire file”, ask for one function at a time
  • Ask for concise responses — add “be brief” or “concise output” to your prompts
  • For code generation — ask for one file at a time instead of entire projects
  • Use streaming if your tool supports it — this allows partial responses even if the total would exceed limits

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Overloaded Errors (529)

Error: 529 {"type":"error","error":{"type":"overloaded_error","message":"Overloaded"}} This is a temporary upstream error from the AI provider (e.g., Anthropic). It means the model is experiencing high traffic. How to handle:
  • Wait a few minutes and retry — these are usually brief
  • Try a different model — switch to an alternative (e.g., from Claude Opus to Claude Sonnet)
  • If persistent, contact support

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Still Having Issues?

Contact support with:
  • The exact error message (screenshot preferred)
  • The model name you’re trying to use
  • Which tool you’re using (Claude Code, Roo Code, Cursor, Chat, API)