DeepSeek Retires Legacy deepseek-chat / deepseek-reasoner Endpoints on July 24 — Migrate to V4

DeepSeek API Docs·low signal

DeepSeek's API docs confirm the legacy deepseek-chat and deepseek-reasoner endpoints (currently mapping to deepseek-v4-flash non-thinking/thinking) are fully retired after July 24, 2026 15:59 UTC. Builders on those endpoints must migrate to the explicit V4-Pro (1.6T total / 49B active) or V4-Flash (284B / 13B) model names before the deadline or face broken calls — an actionable ops item for anyone with DeepSeek in production.