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    anthropic/claude-opus-4.8

    open_router/anthropic/claude-opus-4.8

    ChatVisionFilesToolsSystem promptReasoning
    Use this model

    Context

    1M

    Max output

    128K

    Input / 1M

    $5.00

    Output / 1M

    $25.00

    Cached / 1M

    $0.50

    Cutoff

    unknown

    About this model

    Claude Opus 4.8, Anthropic's most capable generally available Opus model, accessed via OpenRouter. Suited for highly autonomous long-horizon agents, complex coding, and multi-step reasoning. Max output 128,000 tokens.

    Best suited for

    • Autonomous long-horizon agents
    • Complex coding and debugging
    • Multi-step reasoning and project orchestration

    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.

    parallel_tool_calls

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

    reasoning

    Controls the level of reasoning used by the model.

    response_type

    Defines the format or type of the generated response.

    stream

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

    tool_choice

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

    tools

    Lists tool definitions or capabilities available to the model.

    Use this model

    OpenAI-SDK compatible, with gateway fallback and routing across providers.

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    Pricing & provider details

    Open Router logo

    Open Router

    open_router/anthropic/claude-opus-4.8

    Input · per 1M
    $5.00
    Output · per 1M
    $25.00
    Cached input · per 1M
    $0.50
    Context window
    1,000,000 tokens
    Max output
    128,000 tokens
    Knowledge cutoff
    unknown
    Auto-router
    Not supported

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