DeepSeek-V4.1-Flash vs Seed 2.1 Turbo: Specs & Benchmark Comparison
DeepSeek-V4.1-Flash is developed by DeepSeek, while Seed 2.1 Turbo comes from ByteDance. Seed 2.1 Turbo was released in June 2026, and DeepSeek-V4.1-Flash followed 3 months later in September 2026. DeepSeek-V4.1-Flash has a published size of about 552 billion parameters; ByteDance has not disclosed the parameter count of Seed 2.1 Turbo.
The two models share 5 published benchmarks. DeepSeek-V4.1-Flash leads on 4 of them, Seed 2.1 Turbo on 1. The widest gaps are on MathArena Apex, where DeepSeek-V4.1-Flash scores 65.6% against 35.4%; Program Bench, where Seed 2.1 Turbo scores 49.4% against 20.3%. Averaged across everything we track, DeepSeek-V4.1-Flash sits at 60.9% and Seed 2.1 Turbo at 61.0%.
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 Seed 2.1 Turbo, so pricing and context cannot be compared directly.
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| Characteristic | DeepSeek-V4.1-Flash | Seed 2.1 Turbo |
|---|---|---|
| Company | DeepSeek | ByteDance |
| Release Date | September 10, 2026 | June 24, 2026 |
| Parameters | 552B | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | — |
| Context (output) | 393K | — |
| Input Price / 1M | $0.30 | — |
| Output Price / 1M | $1.20 | — |
| Average Score | 60.9% | 61.0% |
| Benchmarks | ||
| MathArena Apex | 65.6% | 35.4% |
| Program Bench | 20.3% | 49.4% |
| Terminal-Bench 2.1 | 90.6% | 67.6% |
| CyberGym | 88.1% | 67.0% |
| NL2Repo | 64.0% | 43.7% |
Visual Benchmark Comparison
Verdict
DeepSeek-V4.1-Flash leads in 1 out of 2 comparison categories.
Both models show comparable average scores: DeepSeek-V4.1-Flash — 0.6, Seed 2.1 Turbo — 0.6.
DeepSeek-V4.1-Flash is newer: released 9/10/2026 vs 6/24/2026.
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Frequently Asked Questions
Which is better for coding — DeepSeek-V4.1-Flash or Seed 2.1 Turbo?
Which model is cheaper — DeepSeek-V4.1-Flash or Seed 2.1 Turbo?
Which has a larger context window — DeepSeek-V4.1-Flash or Seed 2.1 Turbo?
The DeepSeek-V4.1-Flash and Seed 2.1 Turbo 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 Seed 2.1 Turbo page. See also the complete list of AI model comparisons.