DeepSeek-V4.1-Flash vs Hy4 preview: Specs & Benchmark Comparison
DeepSeek-V4.1-Flash is developed by DeepSeek, while Hy4 preview comes from Tencent. Hy4 preview was released in August 2026, and DeepSeek-V4.1-Flash followed a month later in September 2026. The two are similar in size, at about 552 billion and 770 billion parameters respectively.
The two models share 10 published benchmarks. DeepSeek-V4.1-Flash leads on 7 of them, Hy4 preview on 3. The widest gaps are on AutomationBench, where DeepSeek-V4.1-Flash scores 54.8% against 32.1%; CyberGym, where DeepSeek-V4.1-Flash scores 88.1% against 78.4%. Averaged across everything we track, DeepSeek-V4.1-Flash sits at 60.2% and Hy4 preview at 58.7%.
DeepSeek-V4.1-Flash is available through an API at $0.30 per million input tokens with a 1M-token context window. We do not track a hosted API for Hy4 preview, so pricing and context cannot be compared directly.
| Characteristic | DeepSeek-V4.1-Flash | Hy4 preview |
|---|---|---|
| Company | DeepSeek | Tencent |
| Release Date | September 10, 2026 | August 28, 2026 |
| Parameters | 552B | 770B |
| Multimodal | Yes | No |
| Context (input) | 1.0M | — |
| Context (output) | 393K | — |
| Input Price / 1M | $0.30 | — |
| Output Price / 1M | $1.20 | — |
| Average Score | 60.2% | 58.7% |
| Benchmarks | ||
| AutomationBench | 54.8% | 32.1% |
| CyberGym | 88.1% | 78.4% |
| Agents' Last Exam | 31.8% | 22.8% |
| MathArena Apex | 65.6% | 74.2% |
| Humanity's Last Exam (with tools, text-only) | 63.9% | 55.4% |
| Terminal-Bench 2.1 | 90.6% | 85.4% |
| NL2Repo | 64.0% | 58.9% |
| Humanity's Last Exam (no tools, text-only) | 39.1% | 43.4% |
| Program Bench | 20.3% | 17.5% |
| GPQA Diamond | 90.9% | 92.3% |
Visual Benchmark Comparison
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: DeepSeek-V4.1-Flash — 0.6, Hy4 preview — 0.6.
Both models were released around the same time: 9/10/2026 and 8/28/2026.
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Frequently Asked Questions
Which is better for coding — DeepSeek-V4.1-Flash or Hy4 preview?
Which model is cheaper — DeepSeek-V4.1-Flash or Hy4 preview?
Which has a larger context window — DeepSeek-V4.1-Flash or Hy4 preview?
The DeepSeek-V4.1-Flash and Hy4 preview comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the DeepSeek-V4.1-Flash or Hy4 preview page. See also the complete list of AI model comparisons.