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How to fix Next Chat returning 401 or an invalid API key

A 401 means the request reached the AI Code With server and failed at authentication. The problem is the API key itself, its validity, or the account state — not the API host or Model ID. The key belongs only in Next Chat Settings.

Start with these checks

The request reached AI Code With, but authentication failed. Verify the Custom Endpoint API key before changing the API host or Model ID.

  • After sending a message in Next Chat, the app reports 401, Unauthorized, or Invalid API Key.
  • The pasted API key is incomplete, has extra spaces or newlines, or is the wrong key
  • Open Next Chat Settings (gear) and confirm Custom Endpoint is enabled
401UnauthorizedInvalid API Key

01

Confirm the request reached the server

401 / Unauthorized / Invalid API Key means the HTTP request reached https://api.aicodewith.ai and was rejected while checking the Authorization header. Do not change the API host or Model ID yet.

Timeouts, DNS failures, or 404s are address or network problems — use the API host article first. Follow this page only when the error is explicitly 401.

02

Re-paste the API key in Settings

Open Settings → Custom Endpoint, clear the API Key field, and paste the full key. Avoid copied newlines, surrounding spaces, or quotes.

Paste the API key only in Next Chat Settings under Custom Endpoint — never in a public repo or a screenshot. Saving settings is not enough; send a test message afterwards.

  1. 1Open Next Chat Settings (gear) and confirm Custom Endpoint is enabled
  2. 2Clear the API Key field and paste the full key again, with no spaces or newlines

03

Verify the key and account, then send a test message

In the AI Code With dashboard, confirm the key is still valid and the account has balance. Expired, disabled, or zero-balance keys also return 401 at authentication.

After saving, pick the model on the chat page and send a short message. A normal reply with no 401 restores the credential chain. Then match the call by time in usage records.

  1. 1Clear the API Key field and paste the full key again, with no spaces or newlines
  2. 2In AI Code With Key Management, confirm the key is active and the account has balance

Copying or saving settings is not a successful connection. The checkable signals are a real chat reply and a matching usage-record entry.

If it is still not fixed

API host errorModel Not Found / Wrong Model ID

Sources

Reconfigure

Return to the integration center and continue the setup steps.

Return to the related setup step