Use Linkup search with GPT-5.5

GPT-5.5 searches the web through Linkup with one tool entry, "engine": "linkup". Pinning it replaces GPT-5.5's own search, which auto would otherwise use on its maker's endpoint.

Use

Linkup searchwithin

Add Linkup search to GPT-5.5

Set up with agents

Paste this into your coding agent (Claude Code, Cursor, Codex, and more) and it will set up and build with Opper for you.

Get your API key

In your code

1curl https://api.opper.ai/v3/compat/chat/completions \
2  -H "Authorization: Bearer $OPPER_API_KEY" \
3  -H "Content-Type: application/json" \
4  -d '{"model": "openai/gpt-5.5",
5       "messages": [{"role": "user", "content": "What changed in the news today?"}],
6       "tools": [{"type": "opper:web_search", "engine": "linkup"}]}'

Where you can run it

GPT-5.5 runs Linkup search on the routes below. One route also sells flex and priority processing: the same model at another price, picked per request with service_tier. How service tiers work.

Provider	Region	Zero data retention	Training	Input	Output	Cache read
Azure	EU		No	$5.50	$33.00	$0.55	Not offered on this route	Not offered on this route
OpenAI	US		No	$5.00	$30.00	$0.50

The model

GPT-5.5

by OpenAI

GPT-5.5 is OpenAI's newest frontier model, combining strong coding, reasoning, and web search and understanding multi-part tasks, with a 1M context window and vision.