Claude Sonnet 5.5 searches the web through SearchBase with one tool entry, "engine": "searchbase". Pinning it replaces Claude Sonnet 5.5's own search, which auto would otherwise use on its maker's endpoint.
SearchBasewithinPaste this into your coding agent (Claude Code, Cursor, Codex, and more) and it will set up and build with Opper for you.
curl https://api.opper.ai/v3/compat/chat/completions \-H "Authorization: Bearer $OPPER_API_KEY" \-H "Content-Type: application/json" \-d '{"model": "anthropic/claude-sonnet-5-5","messages": [{"role": "user", "content": "What changed in the news today?"}],"tools": [{"type": "opper:web_search", "engine": "searchbase"}]}'
Claude Sonnet 5.5 runs SearchBase on the routes below.
| Provider | Region | Zero data retention | Training | Input | Output | Cache read |
|---|---|---|---|---|---|---|
| EU | No | $2.20 | $11.00 | $0.11$2.75 write | ||
| EU | No | $2.20 | $11.00 | $0.11$2.75 write | ||
| US | No | $2.00 | $10.00 | $0.20$2.50 write | ||
| Multi | No | $2.00 | $10.00 | $0.10$2.50 write | ||
| Multi | No | $2.00 | $10.00 | $0.10$2.50 write | ||
| Multi | No | $2.00 | $10.00 | $0.10$2.50 write |
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.
Step-by-step setup for SearchBase on each of these models through Opper.
Opper's default search engine for models without their own. Search processing stays in the EU.
"engine": "jina"
Exa's search engine built for AI, on any tool-calling model through one tool entry. US-based.
"engine": "exa"
Linkup's search for AI apps, running in the US, EU, Canada and APAC, on any tool-calling model.
"engine": "linkup"