Use Linkup search with Claude Sonnet 5.5

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

Use

Linkup searchwithin

Add Linkup search to Claude Sonnet 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": "anthropic/claude-sonnet-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

Claude Sonnet 5.5 runs Linkup search on the routes below.

Provider	Region	Training	Input	Output	Cache read
AWS Bedrock	EU	No	$2.20	$11.00	$0.11$2.75 write
Google Cloud	EU	No	$2.20	$11.00	$0.11$2.75 write
Anthropic	US	No	$2.00	$10.00	$0.20$2.50 write
AWS Bedrock	Multi	No	$2.00	$10.00	$0.10$2.50 write
Azure	Multi	No	$2.00	$10.00	$0.10$2.50 write
Google Cloud	Multi	No	$2.00	$10.00	$0.10$2.50 write

The model

Claude Sonnet 5.5

by Anthropic

Claude Sonnet 5.5 is Anthropic's fast model for scoped coding, bug fixing, agent work, and polished documents, with adaptive thinking and a one million token context window.