Callstack
1 model across 1 family · Latest: Apex (2026-10)
Callstack's portfolio covers 1 active model across 1 current family, spanning coding, rag, and agents. Open a model detail page to compare provider routes and sourced benchmarks.
Covers 5 workload areas across 1 active tracked model; last verified 2026-10-09.
Use it for
- Teams evaluating coding, rag, and agents across this lab's releases
- Comparing model families before committing to a flagship
- Migration and pricing follow-ups across 1 tracked models
Do not use it for
- Choosing a hosting provider without opening a model page for price ladders
Active models
1
Current models from this lab, excluding deprecated ones
Active families
1
Current model families from this lab
Open catalog
0 open
0 open source / 0 open weights
Lowest output price
$3.00 /1M
Cheapest tracked output across active models, per 1M tokens
Latest dated release
2026-10-01
Apex
Freshness
2026-10-09
Researched today
Information
Release cadence
- Dated releases
- 1
- Latest model
- Apex
- Latest date
- 2026-10-01
Where this lab wins
- Coding: 1 tracked model with SWE-bench / HumanEval-style scores.
- RAG: 1 tracked model with ruler / needle retrieval benchmarks.
- Agentic: 1 tracked model with BFCL, tau-bench, and SWE-bench tool-use coverage.
- Long-context: 1 tracked model with context-token or InfiniteBench-class signal.
Flagship quality / price signal
- Flagship
- Apex
- Selection source
- Best sourced coding Q/$
- Coding grade
- unknown
- Benchmark / output price
- Not enough sourced benchmark and price coverage
About
Callstack is a Wrocław, Poland-based React and React Native engineering company and React Native core contributor, founded in 2016. In 2026 it began training its own coding models under the Apex name, starting with Apex, an agentic coding model specialised in React Native, React and Next.js.
Featured models
| Model | Released | Context | Input price ($/1M) | Output price ($/1M) | License | Openness |
|---|---|---|---|---|---|---|
| Apex | 2026-10-01 | 262k | $0.50 | $3.00 | Proprietary | Proprietary |
Model families
Recent releases
- Apex- 2026-10-01
Explore related pages
Last reviewed: 2026-10-09. Data sourced from public lab announcements and provider documentation.