DeepSeek V4-Pro is the open-weight value champion of 2026. A 1.6T-total / 49B-active mixture-of-experts, it posts roughly 85% on SWE-bench Verified — within a few points of the closed frontier — under a permissive MIT license and at a fraction of the price.
Its DeepSeek Sparse Attention (DSA) is what makes a 1M-token context affordable, using a small fraction of single-token FLOPs versus the previous generation at full context. The companion V4-Flash ($0.14 / $0.28) is the cheapest credible coder on the market.
The honest caveats: it trails the absolute top on the hardest benchmarks, and some enterprise legal teams remain cautious about geopolitical and export-compliance questions despite the open license.
Best for
- High-volume coding and agents on a budget
- Self-hosted deployments needing 1M context
- Cost-sensitive RAG pipelines
Pros & cons
Strengths
- Open weights (MIT) with near-frontier SWE-bench Verified (~85%)
- 1M context made cheap via DeepSeek Sparse Attention
- 5–10× lower price than the closed frontier
Limitations
- A few points behind the very top on the hardest tasks
- Some enterprise teams flag geopolitical/export-compliance uncertainty