Using Apex on Callstack Apex API

Implementation guide · Apex · Callstack

Serverless

Callstack Apex API exposes Apex through model ID apex. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-10-09. Next refresh: weekly.

Quick Start

  1. 1
    Create an account at Callstack Apex API and generate an API key.
  2. 2
    Use the Callstack Apex API SDK or REST API to call apex — see the documentation for request format.
  3. 3
    You'll be billed $0.50/1M input, $3.00/1M output tokens. See full pricing.
API PortalDocumentationPricingModel Card

Code Examples

See Callstack Apex API documentation for integration details.

Pricing on Callstack Apex API

TypePrice (per 1M)
Input tokens$0.50
Output tokens$3.00

Capabilities

ReasoningJSON / Tool usePrompt Caching

About Apex

Apex is Callstack's agentic coding model for mobile and web development, generally available since 1 October 2026. It is a Qwen-based model that Callstack post-trained on React and React Native source code, widely used open-source React Native libraries and its own engineering documentation, so it is strongest at React Native, React and Next.js work: building features, debugging, code review, tests, upgrades and migrations, including to the New Architecture. It has a 262,144-token context window and plugs into Claude Code, Cursor, Codex and other tools through OpenAI- and Anthropic-compatible endpoints.

Full model details →

Model Specs

Released2026-10-01
Context262k

Also available on(1)

Vercel AI Gateway$0.50/1M
Compare all providers →

Provider

Callstack Apex API

Callstack

Wrocław, Poland