A CometAPI 404 is not enough evidence to retire a model from your routing pool. First distinguish a request sent to the wrong path from a response explicitly identifying a missing or unavailable model. Switching models on the status code alone can leave the actual URL bug untouched.
CometAPI’s September 3 troubleshooting article makes that distinction in its 404 section. The guidance below translates that Japanese-language section into a diagnostic sequence; it is not a report of live endpoint testing.
Check the constructed URL before the model ID
The article gives this base URL:
https://api.cometapi.com/v1
That is the base, not a complete request endpoint. Inspect the path the client actually constructs and compare it with the API reference for the operation you intend to call. CometAPI warns that a missing /v1, duplicated path segments, or an incorrect endpoint can produce not only a 404, but also redirects, HTML responses, or SDK parsing errors.
During debugging, the article recommends disabling automatic redirect following. That lets you inspect a redirect rather than mistake its eventual destination for the API response you expected. Treat HTML or a redirect as a reason to investigate routing—not as proof that a model is absent, nor as conclusive proof of one particular URL mistake.
For a suspected path problem, my suggested diagnostic rule is to hold the model choice constant while correcting the URL. Changing both at once makes it harder to tell which change addressed the failure.
Require a model-specific signal
If the response explicitly says the model is unavailable or not found, CometAPI directs readers to check the exact model ID against the current CometAPI Models API. The article says to capture and validate that specific signal before adding model-specific fallback. It does not say that every 404 means “model missing.”
A useful routing policy derived from that guidance is:
| Evidence available | Next decision |
|---|---|
| A path mismatch is identified | Correct the endpoint construction; do not hide it with a model switch. |
| An explicit model-specific error is captured | Check the model ID with CometAPI’s current Models API before considering fallback. |
| Only a status code, HTML, or a parsing failure is available | Keep the cause unresolved and investigate the request/response boundary rather than guessing a replacement model. |
These are suggested diagnostic outcomes, not official CometAPI error-code names. The article does not supply a universal missing-model error string to hard-code, and no current model inventory was queried for this post. A model listing also should not be treated here as a guarantee of successful inference for a particular account or request.
The practical boundary is narrow: a path error belongs in request construction; a separately validated model-specific failure can enter fallback evaluation. Even then, finding another model ID is not a compatibility check. Keep that evaluation separate from deciding what the original 404 meant.