DeepSeek V4.1 Flash, served from the official DeepSeek-V4.1-Flash release: DeepSeek's latest flash model, a 552B mixture-of-experts (8B active per token on prefill, 16B on decode) built for fast agentic coding, with native image understanding and a 1M-token context window. Reasoning has four modes: non-think (none), think low (low), think high (high, the default) and think max (max). Billed per token ($0.15 / $0.60 / $0.028 per 1M; input / output / cache read). Served on our own GPU infrastructure with high availability.