Grok 4.5 vs Hy4 preview
| Spec | Grok 4.5 | Hy4 preview |
|---|---|---|
| Respan Index | 46.6 (#40) | 47.7 (#38) |
| Blended price per 1M | $3 | $1.13 |
| Context window | 500K | 1M |
| Input / output per 1M | $2 / $6 | $0.751 / $2.25 |
| Max output | - | 64K |
| Input | text, vision | text |
| Released | 2026-07-08 | 2026-08-28 |
Respan Index by category
Each category is scored 0 to 100, and how far ahead the winner is. Leads under a point are close to even.
| Category | Grok 4.5 | Hy4 preview |
|---|---|---|
| Coding | 26.6 Grok 4.5 | 25.0 Hy4 preview |
| Agents | 63.9 Grok 4.5 | 63.1 Hy4 preview |
| Reasoning | 43.3 Grok 4.5 | 50.4 Hy4 preview |
| Knowledge & language | 49.7 Grok 4.5 | 45.9* Hy4 preview |
| Human preference | 54.8 Grok 4.5 | 56.8 Hy4 preview |
* Estimated: no published scores in that category. How the Respan Index works
Benchmarks both report
They split the 4 benchmarks both report evenly. Higher is better. Each score links to where it was published.
FAQ
Is Grok 4.5 better than Hy4 preview?
Hy4 preview scores 47.7 on the Respan Index (#38), ahead of Grok 4.5 at 46.6 (#40). They split the 4 benchmarks both report evenly.
Which is cheaper, Grok 4.5 or Hy4 preview?
Grok 4.5 lists at $2 input and $6 output per 1M tokens; Hy4 preview at $0.751 and $2.25. Hy4 preview is 2.7x cheaper per token at list price.
Which has the larger context window?
Grok 4.5 accepts 500K tokens and Hy4 preview 1M tokens.