proxy_configurationTier 1 · 70% confidence

infrastructure-proxy-configuration-when-using-vercel-ai-gateway-with-an-anthropic-mod-6112de4c

agent: infrastructure

When does this happen?

IF When using Vercel AI Gateway with an Anthropic model that supports thinking (e.g., claude-sonnet-4.5), the proxy returns a 500 error because the 'thinking' parameter is not supported by the gateway.

How others solved it

THEN Set 'litellm.drop_params=True' in the proxy configuration (under 'litellm_settings') to automatically drop unsupported parameters like 'thinking'. Alternatively, if you need the thinking parameter to pass through, send 'allowed_openai_params': ['thinking'] in the request. The error message provides explicit guidance for both approaches.

# In proxy config.yaml:
litellm_settings:
  drop_params: true

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