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    gpt-5.6-terra

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    openai/gpt-5.6-terra

    ChatVisionFilesToolsSystem promptReasoning

    Context

    1.1M

    Max output

    128K

    Input / 1M

    $2.00

    Output / 1M

    $12.00

    Modality

    Chat

    Cutoff

    Feb 2026

    About this model

    GPT-5.6 Terra balances intelligence and cost in the GPT-5.6 family. 1.05M context, knowledge cutoff Feb 2026.

    Best suited for

    • Balanced intelligence and cost workloads
    • Production applications
    • Coding and analysis
    • General-purpose AI tasks

    Built-in tools

    Web search

    Hosted by the gateway — enable them per request without wiring your own endpoint.

    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 tokens allowed in a response.

    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.

    reasoning

    Controls the level of reasoning used by the model.

    stream

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