How to Choose the Right CometAPI Endpoint for a Tutorial

Last reviewed: 2026-07-06

Direct answer

Choose the CometAPI endpoint by matching the tutorial task to the smallest documented contract you need to prove. Use the chat completions reference when the example is a multi-message conversation built around roles, messages, and a chat completion response. Use the Responses reference when the tutorial needs a response object workflow, multimodal input, or built-in tool handling. Use the model catalog page when the tutorial depends on current model availability, model IDs, provider families, or capability checks. Use the help center when the tutorial needs account, maintenance, concurrency, privacy, pricing-update, or escalation context.

That decision keeps the tutorial easier to test. It also prevents a common failure: mixing a chat transcript, a response object, a model availability claim, and a support-policy claim into one example that no single page supports. For adjacent checks, see Choose between CometAPI Chat Completions and Responses and How to Review CometAPI Endpoint Sources Before Writing Examples .

A minimal smoke-test workflow:

1. Setup assumptions: the operator has a CometAPI account, an API key stored outside the tutorial as <API_KEY_PLACEHOLDER>, the selected endpoint page open, and the model catalog open if the example needs a model value.
2. Happy-path request plan: send one minimal request that follows the selected endpoint page, using a placeholder model value that the operator has verified from the model catalog immediately before testing.
3. Error-path check: repeat the request with the credential intentionally omitted or replaced by <API_KEY_PLACEHOLDER> and confirm the client records an authentication failure without exposing secrets.
4. Minimum assertions: record the selected documentation URL, endpoint family, request shape used, HTTP status class, response object family, and whether the response matched the documented shape closely enough for the tutorial example.
5. Pass/fail logging fields: endpoint_family, docs_url, accessed_at, credential_source, request_fixture_id, http_status_class, response_shape_observed, result, and notes.
6. Do not assert: exact pricing, rate limits, uptime, model availability, billing totals, latency, or provider-specific behavior unless the linked documentation page and current account evidence support that exact claim.

Sanitized log-record template:

{
  "endpoint_family": "chat_completions_or_responses_or_models",
  "docs_url": "https://apidoc.cometapi.com/...",
  "accessed_at": "2026-07-06",
  "credential_source": "environment_variable_with_placeholder_value",
  "request_fixture_id": "tutorial-smoke-test-001",
  "http_status_class": "2xx_or_4xx_or_5xx",
  "response_shape_observed": "documented_shape_or_mismatch",
  "result": "pass_or_fail",
  "notes": "placeholder-only observation"
}

Who this is for

This guide is for tutorial authors, reviewers, and integration operators who need to decide which CometAPI documentation page should anchor a tutorial example before they write code. It is especially useful when a tutorial might otherwise combine chat completions, Responses, model catalog checks, and support policies in one unsupported sample.

It also helps teams that maintain older examples. If a tutorial started as a quick chat example, but now includes model routing, streaming, structured output, or escalation advice, use this map before expanding the article. The endpoint choice should come before the code sample, because the selected page determines the request shape, response shape, fields to log, and claims that are safe to make.

Key takeaways

• Start from the official CometAPI documentation page that matches the tutorial task, then keep the example within that page’s documented contract.
• Use chat completions for multi-message conversation examples and Responses for response-object workflows, multimodal workflows, or built-in tool handling.
• Check the model catalog separately when a tutorial depends on model IDs, providers, or capabilities.
• Keep support, pricing-update, concurrency, privacy, and maintenance-window statements tied to the help center or another current support page.
• Avoid publishing exact prices, limits, model choices, billing behavior, uptime, or latency expectations unless the current source page directly supports the wording.
• Treat source disagreement as a stop signal for the example, not as permission to average multiple pages into a guessed contract.

Sources checked

• CometAPI chat completions reference - accessed 2026-07-06; purpose: verify chat completion contract areas.
• CometAPI documentation - accessed 2026-07-06; purpose: verify current CometAPI documentation navigation.
• CometAPI help center - accessed 2026-07-06; purpose: verify support and escalation documentation areas.
• CometAPI responses reference - accessed 2026-07-06; purpose: verify responses endpoint contract areas.
• CometAPI models overview - accessed 2026-07-06; purpose: verify model catalog discovery guidance.

Contract details to verify

Failure modes

• Evidence gap: the writer cannot inspect the source page, failing log, local command output, or request fixture. The safe action is to stop and record the missing evidence instead of guessing.
• Scope drift: the repair changes files or examples that are not connected to the observed issue. Keep the repair tied to the failing signal and leave unrelated cleanup for a separate task.
• Environment mismatch: the local check uses different credentials, feature flags, endpoint pages, SDK versions, or runtime settings than the hosted path. Record the mismatch before treating the result as proof.
• Unsupported fallback: the writer changes models, endpoints, permissions, or retry behavior to make a run pass without preserving the review boundary. Treat access and provider failures as operational blockers, not topic failures.
• Weak handoff: the final note says the issue is fixed but omits the source page, request fixture, result, changed example, and remaining uncertainty. That makes the next reviewer repeat the investigation.
• Over-specific claims: the tutorial turns a single successful request into a promise about uptime, rate limits, model availability, latency, or billing. Keep those claims out unless a current source and account-level evidence support them.

Reader next step

Pick the documentation page that matches the example you plan to write, then run one narrow smoke test before you draft the tutorial. If the tutorial is a chat transcript, begin with the chat completions reference. If it is a response-object workflow, begin with the Responses reference. If it depends on a model name or provider capability, verify the model catalog immediately before writing the sample. If it mentions account policy or support handling, check the help center and keep that wording separate from endpoint behavior.

For a broader source-maintenance process, read Keep CometAPI Tutorial Sources Current . To test with your own account after you have selected the endpoint family, use Start with CometAPI .

FAQ

When should a tutorial use chat completions?

Use chat completions when the tutorial is organized around messages, roles, and a chat-style completion response. Verify the exact request and response fields on the chat completions reference before publishing a code sample.

When should a tutorial use Responses?

Use Responses when the tutorial is organized around a response object workflow, multimodal input, stateful behavior, or built-in tool handling. Keep the example aligned with the Responses reference instead of mixing in chat-only assumptions.

Can a tutorial hard-code a model ID?

Only if the model catalog has been checked during the tutorial review window and the article makes clear that readers should verify the current catalog before running the sample. Otherwise, use a placeholder and tell readers where to verify the model.

Can endpoint tutorials mention pricing or limits?

Only when the linked source directly supports the exact wording. If the source pack only supports endpoint behavior, leave pricing, billing, quota, uptime, and rate-limit claims out of the tutorial body.

What should a reviewer do when the docs pages disagree?

Pause the example, record the pages checked, and use the safer wording from the current endpoint reference. If the difference affects credentials, request shape, response shape, or billing behavior, do not present the example as ready until the conflict is resolved.