Try GPT-5.4 online — then use the API with one key

Check gateway support before a Responses migration

The current public pricing catalogue lists Chat Completions for gpt-5.4. This page therefore uses that endpoint and does not promise Responses or Codex support. For a workflow that depends on those interfaces, verify the actual account and channel first. Use the evaluation request to compare reasoning about failure cases, not as a benchmark score.

Suggested evaluation request

This request is a reproducible starting point, not a recorded model output or benchmark. API calls require a funded balance. Check errors, output fields and usage on your own account.

curl https://api.crazyrouter.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $CRAZYROUTER_API_KEY" \
  --data-binary '{
  "model": "gpt-5.4",
  "messages": [
    {
      "role": "user",
      "content": "A job reads a CSV, writes database rows and then acknowledges a queue message. Identify which crash points can create duplicates or lose work, and propose transaction and retry boundaries."
    }
  ]
}'

Source and scope

Gateway catalogue and billing schedule, reviewed 2026-10-11. This confirms published configuration, not end-to-end feature tests or vendor release claims.