DeepSeek has reversed its earlier plan to force users off V4 Pro. In its latest notice, the company said the V4 Pro API will remain available after Sept. 14 and pricing will stay unchanged. It also canceled the previously announced automatic redirection of deepseek-v4-pro requests to V4.1 Flash.
The move marks a clear shift from DeepSeek’s position two days earlier, when it said V4.1 Flash outperformed V4 Pro across performance, pricing, speed and total runtime, and that V4 Pro would be taken offline on Sept. 14. Under that plan, all requests sent to deepseek-v4-pro would have been routed to V4.1 Flash.
That proposal drew pushback from developers. Many production environments had already tuned prompts and agent workflows around V4 Pro, raising concerns that a model swap at the backend could change output behavior. DeepSeek said it decided to keep V4 Pro "in response to broad user demand," effectively withdrawing the mandatory migration plan.
DeepSeek has changed course on its model migration plan. In its latest notice, the company said the V4 Pro API will continue to be offered after Sept. 14, with pricing unchanged. The previously planned automatic switch to V4.1 Flash has also been canceled.
Earlier plan called for V4 Pro to go offline
Two days earlier, DeepSeek had said V4.1 Flash surpassed V4 Pro in performance, price, speed and total runtime, and planned to take Pro offline on Sept. 14. Under that arrangement, all deepseek-v4-pro requests would have been automatically redirected to V4.1 Flash.
Developer pushback led to a reversal
The plan was met with opposition from many developers. A number of production setups had already been tuned around V4 Pro, including prompt configurations and agent workflows, and a backend model replacement could have changed system behavior.
DeepSeek said this time that it would keep V4 Pro "in response to broad user demand," effectively pulling back its original mandatory migration plan.
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