Migrated with permission from DeepSeek V4 Pro, a related editorial property operated by our team.
Checked on June 20, 2026: DeepSeek's official Reasonix integration page now documents npx reasonix code, stores the API key in ~/.reasonix/config.json, defaults to DeepSeek V4 Flash, and exposes /pro plus /preset max for stronger reasoning when needed.
What we verified on June 20, 2026
DeepSeek now has an official Reasonix integration page inside the agent-integrations section of the API docs.
The official startup path is direct and repo-scoped: enter the target project and run npx reasonix code.
The page says the first run persists the DeepSeek API key into ~/.reasonix/config.json, which makes the setup path more concrete than a generic env-var-only article.
DeepSeek documents a Flash-first routing pattern: Reasonix defaults to DeepSeek V4 Flash for cheaper iteration.
The same page gives two explicit escalation commands: /pro for the next turn and /preset max for a Pro-heavy whole-session route.
Sources and publication record
Source material is linked for readers who want to verify the underlying announcement or documentation.