Aurora Alpha is the newer model, released after GPT-5 Codex.
| Spec | Aurora Alpha | GPT-5 Codex |
|---|---|---|
| Input price | Free | — |
| Output price | Free | — |
| Context window | 128K tokens | — |
| Free API (OpenRouter) | No | No |
| Released | Feb 2026 | Sep 2025 |
Not enough votes to call it. On the specs, GPT-5 Codex has the edge: bigger model tier, major provider backing.
Aurora Alpha uses 2.9x more transitions