DeepSeek retires deepseek-chat and deepseek-reasoner on July 24, 2026: your V4 migration checklist
On July 24, 2026 at 15:59 UTC, DeepSeek retires deepseek-chat and deepseek-reasoner, and calls using them then fail. Here is the exact migration to deepseek-v4-flash and deepseek-v4-pro.
