Open-weights week: MiniMax M3.1 Flash matches DeepSeek V4.1 Flash pricing, Space Bunny revealed
A roundup of this week's open-weight releases noting MiniMax M3.1 Flash and DeepSeek V4.1 Flash share $0.15/$0.60 pricing (DeepSeek doubles at peak, MiniMax flat), that M3.1 Flash's early anonymous version was Space Bunny, plus a 50-PR benchmark of Meta Muse Spark Open.
Open weights had a loud week. China and the US both shipped. China: → DeepSeek V4.1 Flash at $0.15 / $0.60 per 1M tokens off-peak (weekday peak doubles it) → MiniMax M3.1 Flash at the same list price, flat 24/7. An early version ran anonymously as Space Bunny. US: → NVIDIA Nemotron 3.5 Super VL, a 120B MoE that activates 12B, multimodal for agents → Reflection Beam, a 501B MoE with 23B active, Apache 2.0 → Meta Muse Spark Open, the open reviewer model I didn't race the Flash models on a leaderboard. I gave Muse Spark Open 50 real merged PRs from 9 OSS repos on Token Factory: 25 later reverted, 25 clean. It caught 12 of the 25 bad ones. 8 of those 12 reproduced when I ran the code. Same week. Different jobs. Flash models race on price and speed. Muse had to catch bugs humans already shipped. My full Muse Spark Open benchmark is below
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