Physix Frontier · News Briefing Card (IT Home · Sep 11, 2026)

DeepSeek Delays V4 Pro API Sunset, Keeps Pricing

KEY FACTS

DeepSeek has decided to continue offering the V4 Pro API service beyond September 14, 2026.
The company confirmed that billing for V4 Pro remains unchanged, with no price adjustments despite the launch of new models.
A previous plan to route V4 Pro requests to V4.1 Flash at new unit prices has been shelved.
DeepSeek released the V4.1 Flash model, which features native multimodal capabilities, on September 10.

KEY DATA

2026-09-14Original sunset date

2026-09-10New model release date

PHYSIX OBSERVATION

DeepSeek's decision to retain the legacy V4 Pro after launching the more powerful V4.1 Flash reflects a cautious balance between aggressive technical iteration and user migration costs. While this move ensures continuity for existing workloads, it also suggests that the new model's compatibility or stability in specific scenarios has not yet fully replaced the old architecture, prompting developers to monitor future version transition rhythms closely.

Source: IT Home report