Use Claude Sonnet 5.5 to review code, compare source documents, and connect multi-step tasks to your tools. Try your own workflow on reAPI.
Start with the prompt in the composer or choose an example.
Credit-based — 1 credit = $0.001 USD. Pay only for completed generations.
30% off official pricing· Input / output tokens
One 1K-token prompt with a 1K-token answer at the cheapest tier.
Claude Sonnet 5.5 is an Anthropic language model for coding and knowledge work, with text and image input and up to one million tokens of context. Bring related code or research into one conversation. Claude Sonnet 5.5 supports adaptive thinking and application-managed tools, so a workflow can continue after your code returns the information needed.
Real-world workflows and production use cases you can build and ship with this model.
Give Claude Sonnet 5.5 the change, the surrounding code, and the behavior your tests are meant to protect. Ask for a reproducible defect and the smallest correction, with a check that would fail before the fix. Review the proposed patch against your project constraints before applying it.
Try Claude Sonnet 5.5 for coding
Give Claude Sonnet 5.5 the competing proposals and your decision criteria. Claude Sonnet 5.5 can connect each conclusion to a supplied source. Ask it to show missing evidence alongside its recommendation so the next reviewer knows what needs checking.
Let Claude Sonnet 5.5 request information through your tools, then return the result. Start with a read-only lookup and have Claude Sonnet 5.5 draft an explanation. Keep permission checks and actions that change a system in your application.
Test Claude Sonnet 5.5 on a task whose result you can assess. Keep the same source material and acceptance criteria when comparing Claude Sonnet 5.5 with another model.
Check the current rates and estimate a representative request before scaling up. Claude Sonnet 5.5 includes thinking in output usage, so leave room for the answer while choosing a budget that fits the task.
Use Claude Sonnet 5.5 through the Messages request format, including structured output and full assistant content. The linked examples show how to stream an answer and carry a tool conversation forward without flattening its content blocks.
Start with the control differences that affect your application. Claude Sonnet 5.5 and Haiku can both handle structured results and tool conversations; compare their answers on your own workload before choosing a default.
Based on Anthropic model and migration documentation checked October 9, 2026. reAPI prices are shown separately above. These specifications are not a benchmark ranking.
Create an API key in your account and keep it on your server. Add funds, then choose a small evaluation task with a result you can independently check.
OpenSend claude-sonnet-5-5 to https://reapi.ai/api/v1/messages with your conversation and output budget. Start from the documented example before adding tools or more detailed output requirements.
OpenRun the suggested test, verify the source citation, or inspect the returned record. Save successful prompts with their evaluation criteria before extending the workflow to additional requests.
Opencurl --no-buffer --request POST \
--url https://reapi.ai/api/v1/messages \
--header "x-api-key: YOUR_API_KEY" \
--header "Content-Type: application/json" \
--data '{
"model": "claude-sonnet-5-5",
"messages": [
{
"role": "user",
"content": "Explain this design clearly."
}
],
"max_tokens": 4096,
"output_config": {
"effort": "high"
},
"stream": true
}'Check stop_reason and all content blocks. Thinking uses output tokens, and a successful HTTP response may still contain an incomplete answer.
Use your active reAPI key and a funded account. The API docs explain headers and token billing.
Return tool results with their matching IDs and keep the previous assistant content, including signed thinking blocks.
Parameters pass through to the upstream service. Follow the returned error information and keep the request ID for diagnosis.
Common questions about this model.
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Try it in the playground or grab an API key to integrate now.
