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Responses Web Search

POST /v1/responses
As of March 23, 2026, Crazyrouter production has verified gpt-5.4 on the Responses API using:
  • tools: [{ "type": "web_search_preview" }]
  • an output sequence of web_search_call, then message
Claude does not currently support POST /v1/responses. For Claude web search, use POST /v1/chat/completions or the native Claude path instead.

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Minimal Request

curl https://crazyrouter.com/v1/responses \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "gpt-5.4",
    "input": "Find one AI news item from March 2026.",
    "tools": [
      {
        "type": "web_search_preview"
      }
    ]
  }'
Observed production response shape: 
{
  "output": [
    {
      "type": "web_search_call"
    },
    {
      "type": "message"
    }
  ]
}

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Current Verification Rule

If you need to confirm that the model actually searched the web, the safest current checks are:
  • whether web_search_call appears in output
  • whether the final answer still arrives as a message
This page no longer keeps older outdated examples, and it does not document un-revalidated search parameters as the current primary path.