Apex

Apex is Callstack’s agentic coding model for mobile and web development, optimized for React Native, React, and Next.js. With a 256K context window, it supports feature development, debugging, code reviews, testing, and large refactors.

Model overview

Model ID: callstack/apex
Provider: callstack
Type: language
Context window: 262,144 tokens
Max output tokens: 131,072

Tags: implicit-caching, reasoning, vision, tool-use

Model pricing

Metric	Value
`Input tokens (/1M)`	`$0.50`
`Output tokens (/1M)`	`$3.00`
`Image generation`	`n/a`
`Cached input read (/1M)`	`$0.20`
`Cached input write (/1M)`	`n/a`
`Pricing source`	`gateway`

Related docs

Model catalog

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Pricing matrix

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Open pricing matrix