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Next Chat

How to fix Next Chat reporting Model Not Found or an unknown model

Next Chat does not sync the AI Code With catalog automatically. Chat can only use Model IDs you type. The ID must match the AI Code With docs exactly; a typo, a missing character, or a display name yields Model Not Found.

Start with these checks

The requested Model ID does not match a model AI Code With offers, or it was mistyped.

  • The request reports Model Not Found or unknown model, or the typed model is missing from the chat page.
  • The Model ID was typed by hand, has extra spaces, or used the display name instead of the ID
  • Copy the exact Model ID from this page (e.g. deepseek-v4-flash)
model not foundunknown model

01

Understand how Next Chat uses the Model ID

The display name can be anything, but the ID sent upstream must be a real AI Code With ID such as deepseek-v4-flash, not “DeepSeek V4 Flash”.

If the list does not show the new model, the custom model was probably not saved, or the chat page is still on a built-in OpenAI model. Confirm Custom Endpoint is enabled first.

02

Re-enter the exact ID from the integration page

Copy the target ID from the model list on this page and paste it into Next Chat. Do not type from memory, and do not add a provider prefix (openai/deepseek-v4-flash is wrong).

Model Not Found is almost always the ID itself, not the API host. A wrong host usually shows up as 404 or a timeout.

  1. 1Copy the exact Model ID from this page (e.g. deepseek-v4-flash)
  2. 2Paste it into Next Chat’s model picker; do not type it, change casing, or add an openai/ prefix

03

Check access and select the model on the chat page

If the ID is correct but the error remains, confirm on the AI Code With docs and pricing page that the model is currently available and your key can access it. Some models are plan-gated.

After saving, pick that entry on the chat page before sending. If you add the model but leave another model selected, the request never uses the new ID. When replies look normal, match the model name in usage records.

  1. 1Paste it into Next Chat’s model picker; do not type it, change casing, or add an openai/ prefix
  2. 2Confirm the current key can access that model

Next Chat does not sync the AI Code With catalog automatically. Each new model requires entering the Model ID again.

If it is still not fixed

401 / Invalid API KeyRequests are not going to AI Code With

Sources

Reconfigure

Return to the integration center and continue the setup steps.

Return to the related setup step