DeepSeek keeps V4-Pro API alive past September 14 after user pushback
DeepSeek
DeepSeek's API docs state that, in response to user demand, DeepSeek V4 Pro will continue to be served after September 14, 2026 with billing unchanged, walking back the retirement announced alongside the V4.1-Flash GA on September 11. Legacy deepseek-v4-flash and deepseek-v4-flash-vision-exp endpoints are now retired, with their requests served by V4.1-Flash at Flash pricing. The platform also opened a DeepSeek Harness developer preview for agent-harness developers.
Why it matters
DeepSeek had been consolidating everything onto the cheaper V4.1-Flash in a move that unsettled memory-chip markets; the walk-back shows sustained demand for the flagship V4-Pro tier just a month after its release.
Importance: 3/5
Reversal of a flagship-tier API deprecation announced Sep 11, one month after V4-Pro release