DeepSeek · Language model

DeepSeek V4.1 Flash

DeepSeek's 552-billion-parameter mixture-of-experts model with MIT-licensed weights and a 1M-token context window. An updated 1017 snapshot arrived on October 17, 2026.

MakerDeepSeek
ReleasedSeptember 10, 2026
API price (per 1M tokens)$0.3 in / $1.20 out
Open weightsYes

DeepSeek's peak-hours rate. Off-peak it's half: $0.15 / $0.60.

Best for

  • Cheap reasoning at scale
  • Self-hosting with a permissive license
  • Batch jobs you can schedule off-peak

Strengths

  • Joint top released open-weight model on the Artificial Analysis Intelligence Index v5 (32, level with GLM-5.3)
  • MIT license, so commercial use is straightforward
  • About $0.26 per Artificial Analysis index task, against $1.24 for Gemini 3.8 Flash

Watch out for

  • Prices double during DeepSeek's weekday peak hours
  • 552B parameters is far too big for a home PC
  • Hosted by a Chinese company, so check data rules before sending anything sensitive to its API

Ranking history

EditionPower RankingsCodingBest ValueOpen-Weight WatchImage GenerationVideo Generation
Week 45, 2026#12 (84)—#4 (90)#1 (90)——
Week 44, 2026#10 (86)—#2 (93)#2 (90)——

Head-to-head