Hy4 preview vs Seed 2.1 Pro: Specs & Benchmark Comparison
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| Characteristic | Hy4 preview | Seed 2.1 Pro |
|---|---|---|
| Company | Tencent | ByteDance |
| Release Date | August 28, 2026 | June 24, 2026 |
| Parameters | 770B | — |
| Multimodal | No | Yes |
| Average Score | 0.6 | 0.6 |
| Benchmarks | ||
| MathArena Apex | 0.7 | 0.3 |
| Program Bench | 0.2 | 0.5 |
| DeepSWE | 0.6 | 0.3 |
| Toolathlon | 0.7 | 0.5 |
| PostTrainBench | 0.4 | 0.2 |
| Agents' Last Exam | 0.2 | 0.4 |
| Terminal-Bench 2.1 | 0.9 | 0.7 |
| NL2Repo | 0.6 | 0.5 |
| CyberGym | 0.8 | 0.7 |
| SWE-Bench Pro | 0.7 | 0.6 |
| Workspace Bench | 0.6 | 0.5 |
| HorizonMath | 0.1 | 0.0 |
| SuperChem | 0.7 | 0.6 |
| OfficeQA Pro | 0.7 | 0.7 |
| OneMillion Bench | 0.7 | 0.7 |
| APEX-Agents | 0.4 | 0.3 |
| MCP Atlas | 0.8 | 0.8 |
Visual Benchmark Comparison
Hy4 preview
Seed 2.1 Pro
MathArena Apex0.7 vs 0.3
0.7
0.3
Program Bench0.2 vs 0.5
0.2
0.5
DeepSWE0.6 vs 0.3
0.6
0.3
Toolathlon0.7 vs 0.5
0.7
0.5
PostTrainBench0.4 vs 0.2
0.4
0.2
Agents' Last Exam0.2 vs 0.4
0.2
0.4
Terminal-Bench 2.10.9 vs 0.7
0.9
0.7
NL2Repo0.6 vs 0.5
0.6
0.5
CyberGym0.8 vs 0.7
0.8
0.7
SWE-Bench Pro0.7 vs 0.6
0.7
0.6
Workspace Bench0.6 vs 0.5
0.6
0.5
HorizonMath0.1 vs 0.0
0.1
0.0
SuperChem0.7 vs 0.6
0.7
0.6
OfficeQA Pro0.7 vs 0.7
0.7
0.7
OneMillion Bench0.7 vs 0.7
0.7
0.7
Verdict
Hy4 preview leads in 1 out of 2 comparison categories.
Overall Performance
Both models show comparable average scores: Hy4 preview — 0.6, Seed 2.1 Pro — 0.6.
Recency
Hy4 preview is newer: released 8/28/2026 vs 6/24/2026.
More About These Models
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Frequently Asked Questions
Which is better for coding — Hy4 preview or Seed 2.1 Pro?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Hy4 preview or Seed 2.1 Pro?
API pricing data is available on the individual model pages.
Which has a larger context window — Hy4 preview or Seed 2.1 Pro?
Context window data is available on the individual model pages.
The Hy4 preview and Seed 2.1 Pro comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Hy4 preview or Seed 2.1 Pro page. See also the complete list of AI model comparisons.