MODEL_AUTHENTICATION

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.

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:

import { ChatOpenAI } from "@langchain/openai";

const model = new ChatOpenAI({
  apiKey: "YOUR_KEY_HERE",
});