DeepSeek-V4-Flash-0731 vs Seed 2.1 Pro: Specs & Benchmark Comparison
DeepSeek-V4-Flash-0731 is developed by DeepSeek, while Seed 2.1 Pro comes from ByteDance. Seed 2.1 Pro was released in June 2026, and DeepSeek-V4-Flash-0731 followed a month later in July 2026. DeepSeek-V4-Flash-0731 has a published size of about 304 billion parameters; ByteDance has not disclosed the parameter count of Seed 2.1 Pro.
The two models share 6 published benchmarks. DeepSeek-V4-Flash-0731 leads on 5 of them, Seed 2.1 Pro on 1. The widest gaps are on DeepSWE, where DeepSeek-V4-Flash-0731 scores 54.4% against 32.7%; Toolathlon, where DeepSeek-V4-Flash-0731 scores 70.0% against 50.6%. Averaged across everything we track, DeepSeek-V4-Flash-0731 sits at 57.5% and Seed 2.1 Pro at 63.7%.
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 Seed 2.1 Pro, so pricing and context cannot be compared directly.
.svg?dpl=dpl_3EZdmE8NdzRwHesETrvSRCczw81T){kind=icon}
| Characteristic | DeepSeek-V4-Flash-0731 | Seed 2.1 Pro |
|---|---|---|
| Company | DeepSeek | ByteDance |
| Release Date | July 31, 2026 | June 24, 2026 |
| Parameters | 304B | — |
| Multimodal | No | Yes |
| Context (input) | 1.0M | — |
| Context (output) | 393K | — |
| Input Price / 1M | $0.14 | — |
| Output Price / 1M | $0.28 | — |
| Average Score | 57.5% | 63.7% |
| Benchmarks | ||
| DeepSWE | 54.4% | 32.7% |
| Toolathlon | 70.0% | 50.6% |
| Agents' Last Exam | 25.2% | 41.4% |
| Terminal-Bench 2.1 | 83.0% | 71.0% |
| NL2Repo | 54.2% | 47.0% |
| CyberGym | 77.0% | 70.2% |
Visual Benchmark Comparison
Verdict
DeepSeek-V4-Flash-0731 leads in 1 out of 2 comparison categories.
Both models show comparable average scores: DeepSeek-V4-Flash-0731 — 0.6, Seed 2.1 Pro — 0.6.
DeepSeek-V4-Flash-0731 is newer: released 7/31/2026 vs 6/24/2026.
More About These Models
Related Comparisons
Frequently Asked Questions
Which is better for coding — DeepSeek-V4-Flash-0731 or Seed 2.1 Pro?
Which model is cheaper — DeepSeek-V4-Flash-0731 or Seed 2.1 Pro?
Which has a larger context window — DeepSeek-V4-Flash-0731 or Seed 2.1 Pro?
The DeepSeek-V4-Flash-0731 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 DeepSeek-V4-Flash-0731 or Seed 2.1 Pro page. See also the complete list of AI model comparisons.