OpenAI: GPT-4o Search Preview

openai/gpt-4o-search-preview

GPT-4o Search Previewis a specialized model for web search in Chat Completions. It is trained to understand and execute web search queries.

MODALITIES

→

INPUT PRICE

$2.50per 1M

OUTPUT PRICE

$10per 1M

CONTEXT

128K

RELEASED

Mar 13, 2025

Provider				Uptime	Chat
FastAPI	—	$2.5	$10

Capabilities

Input modalities

text

Output modalities

text

Features

max_tokensresponse_formatstructured_outputsweb_search_options

Get your API key

Create an API key from the Keys page, then set it as an environment variable:

export ONLIST_API_KEY=sk-...

Make your first request

Endpoints

POSThttps://onlist.io/v1/chat/completions

OpenAI Chat Completions format

Request Headers

Authorization:Bearer $ONLIST_API_KEY

Content-Type:application/json

Model:openai/gpt-4o-search-preview

POSThttps://onlist.io/v1/responses

OpenAI Responses format

Request Headers

Authorization:Bearer $ONLIST_API_KEY

Content-Type:application/json

Model:openai/gpt-4o-search-preview

POSThttps://onlist.io/v1/messages

Anthropic Messages format

Request Headers

Authorization:Bearer $ONLIST_API_KEY

Content-Type:application/json

Model:openai/gpt-4o-search-preview

Code samples

curl https://onlist.io/v1/chat/completions \
  -H "Authorization: Bearer $ONLIST_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "model": "openai/gpt-4o-search-preview",
       "messages": [
         {
           "role": "user",
           "content": "Explain quantum entanglement in one paragraph."
         }
       ]
     }'

Replace $ONLIST_API_KEY with the API key from your Keys page.

Authentication

All requests must include an Authorization: Bearer <TOKEN> header. Generate keys from the Keys page; keys can be scoped to specific models, groups, IP ranges, and rate limits.

Enable streaming

Add "stream": true to receive partial responses as server-sent events in real time.

Streaming example

curl https://onlist.io/v1/chat/completions \
  -H "Authorization: Bearer $ONLIST_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "model": "openai/gpt-4o-search-preview",
       "messages": [
         {
           "role": "user",
           "content": "Write a haiku about recursion."
         }
       ],
       "stream": true
     }'

Supported parameters

Name	Type	Description
`max_tokens`	integer	Maximum number of tokens to generate in the completion.
`response_format`	object	Specifies the output format. Use {"type": "json_object"} for JSON mode.
`structured_outputs`
`web_search_options`

These are the request parameters this model accepts. Parameter semantics follow the OpenAI Chat Completions specification.