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Your model provider is denying you access to their service. This error typically occurs when there’s an issue with your authentication credentials or API keys.

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Troubleshooting

  • Confirm that your API key or authentication credentials are accurate and valid.
  • If using environment-based authentication, verify:
    • The variable name is spelled correctly
    • The variable contains an assigned value
    • Third-party packages like dotenv haven’t interfered with loading
  • If using a proxy or non-standard endpoint, make sure that your custom provider does not expect an alternative authentication scheme.
  • Bypass environment variable issues by passing credentials explicitly:
from langchain_openai import ChatOpenAI

model = ChatOpenAI(api_key="YOUR_KEY_HERE")
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