The Orchestrator › Models › Callstack
Callstack: 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.
Specifications
| Provider | Callstack |
| Model ID | callstack/apex |
| Context window | 262K tokens (262,144) |
| Modalities | text + image → text |
| Tokenizer | — |
| Router sources | Vercel AI Gateway |
| Released | 2026-10-08 |
| Tracked since | 2026-11-14 |
| Popularity | Not in the ranked set |
| Reasoning | — |
Pricing (per million tokens)
| Variant | Source | API ID | Input | Output | Context |
|---|---|---|---|---|---|
| standard | Vercel AI Gateway | callstack/apex | $0.5 | $3.00 | 262K |
Recorded price history
| Date | Input / 1M | Output / 1M | Context |
|---|---|---|---|
| 2026-11-14 | $0.5 | $3.00 | 262K |
Capabilities
Vision (image input)Agentic tool use256K+ context windowControllable reasoning
Supported parameters
max_tokens, temperature, stop, tools, tool_choice, reasoning, include_reasoning