Anthropic: Claude Opus 5.5
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code review and bug finding, financial and scientific analysis, and reading dense charts, diagrams, and screenshots, and it is more careful than its predecessor about only stating figures and citing sources it can back up. The model completes comparable tasks in fewer steps and with fewer tokens than Opus 5, and reports on its work in plainer language, with clear updates on what it did, what it found, and what it needs from the user. Thinking is always adaptive, so effort is the main lever for trading off depth, latency, and cost, and lower effort settings remain effective for latency-sensitive workloads.
Providers for Anthropic: Claude Opus 5.5
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Sample code and API for Anthropic: Claude Opus 5.5
AnyInt generates a quickstart from this model's declared API operations, including complete polling flows for asynchronous media.
Choose an operation and language that match this model.
Call the standard operation supported by this model.
/anthropic/v1/messagescurl 'https://api.anyint.ai/anthropic/v1/messages' \
-H "Content-Type: application/json" \
-H "x-api-key: <YOUR_API_KEY>" \
-d '{
"model": "claude-opus-5-5",
"max_tokens": 1024,
"messages": [
{
"role": "user",
"content": "Describe a calm futuristic city at sunrise."
}
]
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