$ diff deepseek-v4-1-flash hy4-preview
DeepSeek V4.1-Flash vs Hy4 preview
Values come from DeepSeek V4.1-Flash and Hy4 preview, where each is cited to its source. This page states no benchmark result and ranks neither model — it puts two published specifications next to each other. Where a lab has not published a figure, the row says so rather than guessing.
DeepSeekDeepSeek V4.1-Flash
- context
- 1M
- weights
- open
- $/M in
- $0.15
- $/M out
- $0.6
- context
- 1M
- weights
- open
- $/M in
- $0.834
- $/M out
- $2.501
What actually differs
- Context window
- Identical — both accept 1M tokens, so context length is not a reason to pick either.
- Input price
- DeepSeek V4.1-Flash at $0.15/M against $0.834/M — 5.6× cheaper to feed. Standard rates: one of these labs also quotes a lower cached-input tier, which applies only when a prefix is reused — see the full spec below.
- Output price
- DeepSeek V4.1-Flash at $0.6/M against $2.501/M — 4.2× cheaper to generate. Output dominates the bill on most agentic workloads, where the model writes far more than it reads.
- Weights
- Both publish weights — DeepSeek V4.1-Flash under MIT (open-weight), Hy4 preview under Apache-2.0. Check the licences rather than assuming they permit the same commercial use.
- Recency
- DeepSeek V4.1-Flash shipped 13 days after Hy4 preview (2026-09-10 vs 2026-08-28).
Full spec
| Attribute | DeepSeek V4.1-Flash | Hy4 preview |
|---|---|---|
| Developer | DeepSeek | Tencent |
| Released | 2026-09-10 | 2026-08-28 |
| Context window | 1,000,000 | over 1,000,000 |
| Pricing | $0.15/M input (cache miss) · $0.003/M input (cache hit) · $0.60/M output, off-peak; peak rates double — see Pricing | $0.834/M input · $2.501/M output |
| License | MIT (open-weight) | Apache-2.0 |
| Availability | DeepSeek API, Hugging Face (`deepseek-ai/DeepSeek-V4.1-Flash`) | Hugging Face (BF16 + FP8), ModelScope, GitCode, CNB, Tencent Cloud TokenHub, OpenRouter, WorkBuddy, CodeBuddy, Yuanbao, ima |