DeepSeek-V4-Flash-0731 vs Hy4 preview: Specs & Benchmark Comparison
DeepSeek-V4-Flash-0731 is developed by DeepSeek, while Hy4 preview comes from Tencent. DeepSeek-V4-Flash-0731 was released in July 2026, and Hy4 preview followed a month later in August 2026. Hy4 preview is the larger model at roughly 770 billion parameters, against 304 billion for DeepSeek-V4-Flash-0731.
The two models share 7 published benchmarks. Hy4 preview leads on 6 of them, DeepSeek-V4-Flash-0731 on 1. The widest gaps are on DeepSWE, where Hy4 preview scores 64.3% against 54.4%; AutomationBench, where Hy4 preview scores 32.1% against 25.1%. Averaged across everything we track, DeepSeek-V4-Flash-0731 sits at 57.5% and Hy4 preview at 58.7%.
DeepSeek-V4-Flash-0731 is available through an API at $0.14 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-Flash-0731 | Hy4 preview |
|---|---|---|
| Company | DeepSeek | Tencent |
| Release Date | July 31, 2026 | August 28, 2026 |
| Parameters | 304B | 770B |
| Multimodal | No | No |
| Context (input) | 1.0M | — |
| Context (output) | 393K | — |
| Input Price / 1M | $0.14 | — |
| Output Price / 1M | $0.28 | — |
| Average Score | 57.5% | 58.7% |
| Benchmarks | ||
| DeepSWE | 54.4% | 64.3% |
| AutomationBench | 25.1% | 32.1% |
| NL2Repo | 54.2% | 58.9% |
| Toolathlon | 70.0% | 74.1% |
| Terminal-Bench 2.1 | 83.0% | 85.4% |
| Agents' Last Exam | 25.2% | 22.8% |
| CyberGym | 77.0% | 78.4% |
Visual Benchmark Comparison
Verdict
Hy4 preview leads in 1 out of 2 comparison categories.
Both models show comparable average scores: DeepSeek-V4-Flash-0731 — 0.6, Hy4 preview — 0.6.
Hy4 preview is newer: released 8/28/2026 vs 7/31/2026.
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Frequently Asked Questions
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The DeepSeek-V4-Flash-0731 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-Flash-0731 or Hy4 preview page. See also the complete list of AI model comparisons.