Legacy aliases retired: deepseek-chat, deepseek-reasoner

What changed

Impact summary

The listed aliases were scheduled for discontinuation on Jul 24, 2026. Replacement: deepseek-v4-flash.

BeforeLegacy non-thinking / thinking aliases

After / replacementdeepseek-v4-flash

Affected models and systems

deepseek-chatdeepseek-reasoner

Migration action

Recommended next step: Replace deepseek-chat, deepseek-reasoner with deepseek-v4-flash; test the required thinking mode.

Source and interpretation

API platform & regional scope

DeepSeek direct API · Direct API; country eligibility not established by the reviewed log.

Not third-party hosting.

Bounded manual review of the registered official sources; not a complete archive.

Unconfirmed regions are not assumed to be global. Automatic monitoring is OFF. Source checks

Official evidence locators

2026/04/24 → API Update; legacy alias discontinuation paragraph — will be discontinued in three months (2026-07-24)

Exact announcement or API start date is not stated unless separately recorded.

Affected endpoints: Not separately specified; check model / capability scope

Action / deadline: Review required · Stated deadline

This record is classified as official announcement. The facts above were normalized from the provider's public developer documentation. API Change Watch does not treat an unreviewed page diff as a verified announcement.

Read the official source ↗