DeepSeek V4.1 Pro

Estimated release

Nov 12, 2026

Mid Nov 2026

Details

Status: Named in DeepSeek's Sept 10 announcement; no date given
Current model: DeepSeek V4.1 Flash, 39.5 on the Intelligence Index, released Sep 10, 2026 ()
Projected score: About 42.5 (+3)
Typical cycle: About 40 days between releases

DeepSeek announced V4 Pro API retirement on Sept 14, then reversed it days later citing user demand — the flagship model ID stays live
V4.1 Flash (552B MoE, 8B active on input) already outscores the 1.6T V4 Pro at roughly a quarter of the per-token cost
DeepSeek named V4.1 Pro in the Sept 10 V4.1 Flash announcement but gave no date; a leaked Sept 30 window has passed
Upgraded Multi-Head Latent Attention with an 890-byte-per-token KV cache, down from 3,500 bytes

Source: DeepSeek V4.1 Flash release (Sept 10, 2026), V4 Pro retirement reversal (Sept 11-15, 2026) & Artificial Analysis