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Apex API

callstack/apex/chat

Apex from Callstack supports React Native and React application development. This chat API accepts text / images, provides a 262,144-token input budget and accepts max_tokens up to 131,072. Stream Apex’s text as it arrives, or let a function-call result supply the evidence for the next step in React Native development with Apex.

Input $0.50Output $3per 1 million tokensCached input $0.20
Run model

Workbench

These examples were written for this endpoint. Replace the prompt and sample media URLs with your own accessible inputs, then check the current quote and model availability before submitting.

  • Input types
    Text
    Output types
    Text
    Input
    $0.50 / 1 million tokens
    Cached input
    $0.20 / 1 million tokens
    Output
    $3 / 1 million tokens
    Context
    262,144
    Max output
    131,072

    $0.50/3per 1 million tokens · input / output

    basic

    Apex is Callstack’s coding model, with particular emphasis on React Native. Send the component, the platform involved, the package versions and the observed behavior as text. A screenshot alone cannot be read by this text-only endpoint.

    • 1024
  • Input types
    Text
    Output types
    Text
    Input
    $0.50 / 1 million tokens
    Cached input
    $0.20 / 1 million tokens
    Output
    $3 / 1 million tokens
    Context
    262,144
    Max output
    131,072

    $0.50/3per 1 million tokens · input / output

    tool-step

    Apex may request a function call, but your application controls access to files and test commands. Preserve tool_call_id when returning results, then review the patch and verify it on the target platform. Streaming makes a long explanation readable before the response is complete.

    • 1024
    • auto

This example starts at Input $0.50 / Output $3 per 1 million tokens. The Playground updates the estimate when you change the settings.