DeepSeek Models

Competitive open model family with strong coding and reasoning, suitable for private deployments.

Latest: DeepSeek‑V4.1‑Flash

DeepSeek-V4.1-Flash (Sep 2026, MIT license) introduces a new causal encoder-decoder architecture with native multimodal support and a 1M-token context window. Independent tests put it ahead of the larger DeepSeek-V4-Pro on performance, cost, and speed — V4-Pro traffic is being migrated to it.

Strengths

  • 1M-token context
  • Native multimodal input
  • Open weights (MIT)

Best For

  • Developer tools
  • Private deployments
  • Cost-sensitive high-volume workloads

Model Lineup

DeepSeek‑V4.1‑Flash

Latest open-weight model, outperforms V4-Pro on cost/speed.

DeepSeek‑V4‑Pro

Previous flagship, being phased out in favor of V4.1-Flash.

DeepSeek‑R1

Reasoning‑oriented model, still used for planning/tool-use benchmarks.