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    claude-opus-4-8

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    anthropic/claude-opus-4-8

    ChatVisionFilesToolsSystem promptReasoning

    Context

    1M

    Max output

    128K

    Input / 1M

    $5.00

    Output / 1M

    $25.00

    Modality

    Chat

    Cutoff

    Jan 2026

    About this model

    Claude Opus 4.8 is Anthropic's most capable and intelligent model, optimized for complex reasoning, advanced coding, deep research, and long-horizon autonomous agent workflows. Supports up to a 1M-token context window at standard pricing.

    Best suited for

    • Complex, high-stakes reasoning and analysis
    • Advanced coding and technical tasks
    • Deep research and multi-step workflows
    • Autonomous agent workflows

    Capabilities

    Vision

    Accepts images alongside text in the same message.

    Files

    Accepts file attachments — PDFs, transcripts, spreadsheets.

    Tools

    Native function calling, so agents can invoke your endpoints.

    System prompt

    Honours a dedicated system role, separate from the user turn.

    Reasoning

    Emits a separate thinking pass before the answer.

    Supported parameters

    max_tokensMax Tokens Limit

    Specifies the maximum number of text units (tokens) allowed in a response, limiting its length.

    tools

    Lists tool definitions or capabilities available to the model.

    tool_choice

    Decides whether to use tools or just the model for generating responses.

    response_type

    Defines the format or type of the generated response.

    parallel_tool_calls

    Enables parallel execution of tools, allowing multiple tools to run simultaneously.

    reasoning

    Controls the level of reasoning used by the model.

    stream

    Sends the response in real-time as it's being generated.