Hy3 preview vs Seed1.8
| Spec | Hy3 preview | Seed1.8 |
|---|---|---|
| Respan Index | 28.7 (#87) | 27.5 (#89) |
| Blended price per 1M | $0.285 | - |
| Context window | 256K | 256K |
| Input / output per 1M | $0.18 / $0.6 | - |
| Max output | - | 64K |
| Input | text | text, vision, video |
| Released | 2026-04-23 | 2025-12-18 |
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 | Hy3 preview | Seed1.8 |
|---|---|---|
| Coding | 11.6 Hy3 preview | 9.7 Seed1.8 |
| Agents | 36.8 Hy3 preview | 34.2 Seed1.8 |
| Reasoning | 27.2* Hy3 preview | 28.8* Seed1.8 |
| Knowledge & language | 23.9* Hy3 preview | 20.3 Seed1.8 |
| Human preference | 49.3 Hy3 preview | 48.8* Seed1.8 |
* Estimated: no published scores in that category. How the Respan Index works
Benchmarks both report
Hy3 preview leads on 3 of the 3 benchmarks both report. Higher is better. Each score links to where it was published.
FAQ
Is Hy3 preview better than Seed1.8?
Hy3 preview scores 28.7 on the Respan Index (#87), ahead of Seed1.8 at 27.5 (#89). Hy3 preview leads on 3 of the 3 benchmarks both report.
Which has the larger context window?
Both accept 256K tokens of context.