DeepSeek

DeepSeek-V4 model family

Generally Available

DeepSeek's open-weight V4 line. The live Flash checkpoint as of 18 October 2026 is DeepSeek-V4.1-Flash-1017, served as deepseek-flash. The 10 September card still describes a 552B backbone, 8B active parameters on prefill and 16B on decode, and 196B Engram parameters. Both cards list 763B in Safetensors metadata. V4-Pro-0813, 1.6T total and 49B active on the earlier card, remains a separate API model. Company benchmark scores for 1017 were not independently reproduced in this pass.

Latest update Oct 18, 2026

DeepSeek-V4 model family

01

Current status

1017 is a company-described minor update. It does not restate the September 552B, 8B-prefill, or 16B-decode counts. Terminal-Bench 4.0 at 42.3 used Claude Code, and DeepSWE v1.1 at 77.0 used Mini-SWE-V2. No independent lab reproduction of those two figures was found. V4-Pro remains available and is not rerouted to Flash.

02

Specifications3

V4-Pro Parameters
1.6T total / 49B active
Context Window
1M tokens
License
MIT (open weights)

03

More from DeepSeek2

04

More in AI Labs