Put Claude Opus 5.5 to work on code that needs a careful review, research that spans many documents, and explanations your team can act on. Try it 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.
One 1K-token prompt with a 1K-token answer at the cheapest tier.
Claude Opus 5.5 is Anthropic’s model for coding and knowledge work, introduced as the first release in its 5.5 family. Bring the source material behind a difficult task and ask for a useful result: a focused code review, a decision brief, or a clear explanation. With room for up to one million tokens of context, Claude Opus 5.5 lets you keep related files and documents together instead of repeatedly rebuilding the background.
Real-world workflows and production use cases you can build and ship with this model.
Review a change with the surrounding code and tests in view. Give Claude Opus 5.5 the relevant modules and constraints, then ask for a focused fix or migration plan. Use the suggested checks to verify the patch before it reaches your users.
Try Claude Opus 5.5 for coding
Bring proposals, review comments, and supporting documents into one conversation. Claude Opus 5.5 can compare options and draft a decision brief that points back to your sources. Ask for evidence beside each recommendation so your team can review the reasoning without searching through every document.
Turn a dense incident report into an explanation your reader can use. Tell Claude Opus 5.5 who the audience is and what they need to decide. Ask for the conclusion first, then refine the draft against your team’s tone and the facts you supplied.
Start with a task in the playground above and review the answer yourself. When you are ready to build, call Claude Opus 5.5 through the familiar Chat Completions format, using the same prompts you have already evaluated.
Compare input and output rates in the pricing table before you start. Claude Opus 5.5 is billed by token usage, so you can choose a response budget and see how a short question differs from a long research task.
Keep your model usage under one reAPI account. Your API key and credit balance also work with the platform’s image, video, and audio models, making it easier to add Claude Opus 5.5 to an application that already uses reAPI.
Considering Claude Opus 5.5 for an existing workflow? Compare the documented differences below, then try the same task on both models to see what changes for your application.
Based on Anthropic's model and migration documentation, checked September 23, 2026. Native-platform pricing is distinct from reAPI pricing, shown above.
Sign in to reAPI, open API keys, and create a key for your application. Add credits to your account and store the credential on your server.
OpenSet your client’s base URL to https://reapi.ai/api/v1 and select claude-opus-5-5. The API docs include examples you can adapt to your project.
OpenAsk Claude Opus 5.5 to review a module, compare two proposals, or explain an incident. Check the answer against your source material, then refine the prompt for repeat use.
Opencurl --no-buffer https://reapi.ai/api/v1/chat/completions \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"claude-opus-5-5","messages":[{"role":"user","content":"Explain this design clearly."}],"reasoning_effort":"medium","max_tokens":4096,"stream":true}'Check the model ID, message format, supported effort levels, and output limit. The API documentation lists the accepted fields.
Use an active reAPI key and a positive credit balance. Completed responses are billed from reported usage.
Inspect finish_reason and returned content, even after HTTP 200. Thinking uses output tokens; leave room for the visible answer.
Enable streaming for longer tasks and retry rate limits with backoff. Keep the request ID when contacting support.
Common questions about this model.
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Try it in the playground or grab an API key to integrate now.