DeepSeek V4.1 Flash 1017 released as open-weight model with 1M token context and MIT license

DeepSeek released V4.1 Flash 1017, a 552B total/16B active MiE model with a 1M-token context window and MIT license. It is available through DeepSeek's API and major cloud platforms. The model scores 45 on the AA Intelligence Index, tying with GLM-5.3 for second among open-weight models, and shows improved non-hallucination rates on AA-Omniscience. It ranks #1 open model in Code Arena WebDev and Agent Arena. Pricing remains at $0.30/$1.20 per million input/output tokens during peak hours.