claude-opus-4-8

Claude Opus 4.8 is our most intelligent Opus model and the best generally available model for coding and agents, with deeper reasoning for enterprise workflows.

Description

Claude Opus 4.8 is our most intelligent Opus model and the best generally available model for coding and agents, with deeper reasoning for enterprise workflows.

Version 2

Version 2 of Claude Opus 4.8 is hosted on Azure infrastructure. Microsoft Foundry Claude models on Azure infrastructure have full Azure data residency for inference processing. Version 2 supports both Global Standard and US DataZone deployment types.

Version 2 currently supports core Messages API features including tool alls and prompt caching. If you need additional features including structured outputs, Web Search, and Files, you can use Version 1 which is hosted on Anthropic infrastucture. We will be adding those API capabilitlies to Version 2 in the coming months API feature differences

Please refer to the Claude Opus 4.8 System Card .

Training cut-off date

January 2026

Input formats

Image & text input: With powerful vision capabilities, Claude Opus 4.8 can process images and return text outputs to analyze and understand charts, graphs, technical diagrams, reports, and other visual assets.

Text output: Claude Opus 4.8 can output text of a variety of types and formats, such as prose, lists, Markdown tables, JSON, HTML, code in various programming languages, and more.

Supported language

Claude Opus 4.8 can understand and output a wide variety of languages, such as English, French, Standard Arabic, Mandarin Chinese, Japanese, Korean, Spanish, and Hindi. Performance will vary based on how well-resourced the language is.

Supported Azure regions

• Global Standard
• US DataZone

Sample JSON response

Input

{
  "model": "claude-opus-4-8",
  "max_tokens": 4096,
  "messages": [
    {
      "role": "user",
      "content": "Analyze this code for security vulnerabilities and suggest fixes."
    }
  ]
}

Output

{
  "content": [
    {
      "text": "I'll analyze this code for security vulnerabilities...",
      "type": "text"
    }
  ],
  "id": "msg_example",
  "model": "claude-opus-4-8",
  "role": "assistant",
  "stop_reason": "end_turn",
  "type": "message",
  "usage": {
    "input_tokens": 42,
    "output_tokens": 256
  }
}

Model architecture

Please refer to the Claude Opus 4.8 System Card .