Hy4 Preview is the newer model, released after Claude Opus 4.5.
| Spec | Claude Opus 4.5 | Hy4 Preview |
|---|---|---|
| Input price | — | $0.834/M tokens |
| Output price | — | $2.501/M tokens |
| Context window | — | 1.0M tokens |
| Released | Nov 2025 | Aug 2026 |
Not enough votes to call it. On the specs, nothing separates them.
Claude Opus 4.5 uses 3.1x more sentence length
Hy4 Preview is the newer model, released after Claude Opus 4.5.
| Spec | Claude Opus 4.5 | Hy4 Preview |
|---|---|---|
| Input price | — | $0.834/M tokens |
| Output price | — | $2.501/M tokens |
| Context window | — | 1.0M tokens |
| Released | Nov 2025 | Aug 2026 |
Not enough votes to call it. On the specs, nothing separates them.
Claude Opus 4.5 uses 3.1x more sentence length