DeepSeek-V4-Flash-Max (Reasoning)

by DeepSeek

DeepSeek-V4-Flash-Max (Reasoning) is a reasoning model from DeepSeek, released on April 23, 2026. It has a 1M-token context window and can generate up to 1M output tokens. API pricing is $0.09 per 1M input tokens and $0.18 per 1M output tokens.

DeepSeek-V4-Flash-Max is the maximum reasoning effort mode of DeepSeek-V4-Flash, a 284B-parameter MoE model with 13B activated parameters and a 1M-token context window. Sharing the V4 series' hybrid attention architecture (Compressed Sparse Attention combined with Heavily Compressed Attention), Manifold-Constrained Hyper-Connections, and Muon optimizer, V4-Flash-Max delivers reasoning performance comparable to V4-Pro when given a larger thinking budget while operating at a fraction of the parameter scale. It is pre-trained on more than 32T tokens and post-trained with a two-stage paradigm of domain-specific expert cultivation followed by on-policy distillation.

Key specs

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