Claude Sonnet 5.5 uses Claude code execution through Opper on the Messages endpoint, passed through as Anthropic defines it. It runs on Anthropic's own route, not on Bedrock or Vertex.
Paste 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/v1/messages \-H "Authorization: Bearer $OPPER_API_KEY" \-H "Content-Type: application/json" \-d '{"model": "anthropic/claude-sonnet-5-5", "max_tokens": 1024,"messages": [{"role": "user", "content": "Sum the first 50 primes and show your working."}],"tools": [{"type": "code_execution_20260521", "name": "code_execution"}]}'
Claude Sonnet 5.5 runs Claude code execution on the routes below.
| Provider | Region | Zero data retention | Training | Input | Output | Cache read |
|---|---|---|---|---|---|---|
| US | No | $2.00 | $10.00 | $0.20$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 Claude code execution on each of these models through Opper.
GPT models write and run Python in a sandbox, on the Responses endpoint.
code_interpreterGemini runs code to work out its answer, on generateContent.
codeExecutionClaude drives a desktop through screenshots, clicks and typing in your agent loop.
computer_toolset