DeepSeek Retires Legacy Model Aliases on July 24, 2026

Migrated with permission from DeepSeek V4 Pro, a related editorial property operated by our team.

Checked on July 5, 2026: DeepSeek's official homepage still anchors the official @deepseek_ai X presence, but the strongest current first-party developer signal is in the API docs and changelog, which both keep the July 24, 2026 retirement warning for deepseek-chat and deepseek-reasoner while pointing users to explicit deepseek-v4-flash and deepseek-v4-pro model names.

The stronger current first-party signal is that DeepSeek's official API docs still place the same concrete retirement warning in two prominent places: the API quick-start and the change log both say deepseek-chat and deepseek-reasoner will be discontinued on July 24, 2026 at 15:59 UTC.

What we verified on July 5, 2026

DeepSeek's official homepage still anchors the official X account through the V4 Preview banner, confirming @deepseek_ai remains the first-source account surface even when the direct timeline is hard to crawl.

DeepSeek's official API quick-start still warns that deepseek-chat and deepseek-reasoner will be deprecated on July 24, 2026 at 15:59 UTC.

DeepSeek's official change log repeats the same retirement date and clarifies the transition mapping: deepseek-chat currently points to V4 Flash non-thinking mode, and deepseek-reasoner currently points to V4 Flash thinking mode.

The same official change log keeps deepseek-v4-pro and deepseek-v4-flash as the current explicit model names, which makes alias cleanup a real operations task rather than a cosmetic docs update.

This is migration and support coverage only. It does not create any new plan card, stock promise, or pricing-page inventory change in this repo.