Originally published on AI Tech Connect.
What changed DeepSeek released V4.1 Flash on 10 September 2026, replacing V4 Pro at the top of its lineup. Architecture: sparse mixture-of-experts, 552 billion total parameters, roughly 8 billion active per token on input and 16 billion on output. Native vision. A one-million-token context window. Licence: MIT. The most permissive licence in common use — commercial deployment, redistribution and fine-tuning, with no revenue thresholds and no usage restrictions. Weights are on Hugging Face. Pricing: $0.30 input and $1.20 output per million tokens at peak; $0.15 and $0.60 off-peak. Off-peak cache-hit input is $0.003 per million. Verified benchmarks: 74.2 on DeepSWE v1.1, above both the Opus 5.0 and GPT-5.6 Sol columns; 88.1% on CyberGym, leading the public leaderboard snapshot at the time…
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