DeepSeek-V4.1-Flash Release
Point integrations at deepseek-flash; re-check costs on the official pricing page; legacy model names still work via temporary routing.
DeepSeek's change log says: Today, we officially release the DeepSeek-V4.1-Flash model. It is the smallest model in our new architecture family, with native multimodal visual understanding. The new architecture is designed for a higher capability ceiling, faster inference, higher throughput, and scaling to larger models. API: use model name deepseek-flash for V4.1 Flash; deepseek-v4-flash and deepseek-v4-flash-vision-exp are retired and temporarily routed to V4.1 Flash. V4 Pro API service continues after 2026-09-14 with unchanged billing; API prices were reduced.
Who it affects: API users on deepseek-flash and legacy deepseek-v4-flash* names; app and web users; anyone on V4 Pro pricing.
What it means: Point integrations at deepseek-flash; re-check costs on the official pricing page; legacy model names still work via temporary routing.
Official sources
Related pages: /models/deepseek-v4-1-flash · /api-pricing · /guides/model-name-migration · /news
Context for developers
The 2026-09-10 API change log entry is the canonical source for V4.1-Flash availability. It states that deepseek-flash is the API string, retires deepseek-v4-flash variants with temporary routing, and notes reduced list prices on the Models & Pricing page. V4 Pro service continues with unchanged billing until DeepSeek announces otherwise.
Integrators should update integration tests, SDK configs, and billing alerts together. The migration guide lists every alias; off-peak windows still apply to Flash and Pro rows after the price cut.
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