metadata
license: cc-by-4.0
tags:
- pixel-canary
- callstack-apex
- stealth-model
- stealthmark
- coding
- reasoning
thumbnail: https://stealthmodels.com/pixel-canary/assets/social-card-v3.png
Our reasoning study pointed to Qwen two days before Callstack revealed Pixel Canary as Apex, a Qwen-based coding model built for React Native.
By Stealth Models.
Compare it with the Qwen 3.8 family
Facts as text
| Fact | Value |
|---|---|
| First seen | 25 Sep 2026 |
| Revealed | 1 Oct 2026 |
| Developer | Callstack (Poland) |
| Context | 262,144 tokens |
| Input | Text |
| Tool calls | unknown |
| Speed in our tests | about 255 tok/s |
| Access | Active as a hosted API |
Run it
Callstack serves Apex as a hosted model, so there are no weights to download.
StealthMark leaderboard
Text and images: CC BY 4.0, stealthmodels.com.