Ollama Launch Claude Fails with API Error 400 When CLAUDE_CODE_USE_BEDROCK=1 Is Set in Claude Code Settings

What this error means

ollama launch claude: API Error 400 when CLAUDE_CODE_USE_BEDROCK=1 is set is a Ollama failure pattern reported for developers trying to fix ollama launch claude failing with api error 400 when claude_code_use_bedrock environment variable is set in claude code settings. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

Open issue on ollama/ollama. Configuration conflict between Ollama and Claude Code’s Bedrock settings. The model name is sent to Bedrock instead of Ollama. Clear reproduction with specific error code.

Common causes

• When users have CLAUDE_CODE_USE_BEDROCK=1 in ~/.claude/settings.json, ollama launch claude routes requests to AWS Bedrock instead of the local Ollama instance, causing Bedrock to reject the model name with API Error 400. This is a confusing configuration conflict.
• Open issue on ollama/ollama. Configuration conflict between Ollama and Claude Code’s Bedrock settings. The model name is sent to Bedrock instead of Ollama. Clear reproduction with specific error code.

Quick fixes

1. Confirm the exact error signature matches ollama launch claude: API Error 400 when CLAUDE_CODE_USE_BEDROCK=1 is set.
2. Check the Ollama account, local tool state, and provider configuration involved in the failing workflow.
3. Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

• Verify the command, editor, extension, or API client that produced the error.
• Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
• Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

1. Capture the exact error message and the command, editor action, or request that triggered it.
2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
3. Review the source evidence below and compare it with your environment.
4. Apply one change at a time and rerun the smallest failing action.
5. Keep the working fix documented for the team or deployment environment.

How to prevent it

• Keep provider/tool configuration documented.
• Record non-secret diagnostics such as tool version, provider name, model name, and command path.
• Add a lightweight check before CI or production workflows depend on the tool.

Sources checked

• https://github.com/ollama/ollama/issues/16097

Evidence note: Open issue on ollama/ollama. Configuration conflict between Ollama and Claude Code’s Bedrock settings. The model name is sent to Bedrock instead of Ollama. Clear reproduction with specific error code.

Related errors

• Claude Code Remote Control fails with custom API keys
• LiteLLM proxy for Codex CLI does not work

FAQ

What should I check first?

Start with the exact ollama launch claude: API Error 400 when CLAUDE_CODE_USE_BEDROCK=1 is set text and the smallest action that reproduces it.

Can I ignore this error?

No. Treat it as a failed Ollama workflow until the root cause is understood.

Is this guaranteed to have one fix?

No. The imported evidence supports the troubleshooting path above, but tool behavior can vary by account, plan, version, provider, and local configuration.

How do I know the fix worked?

Rerun the same command, editor action, or request. The fix is working when that action completes without ollama launch claude: API Error 400 when CLAUDE_CODE_USE_BEDROCK=1 is set.