Open-weight AI models caught the frontier in August 2026, with Kimi K3 ranking #3 in the world. This guide compares the eleven best — Kimi K3, Qwen3.8-Max, GLM-5.2, DeepSeek V4, Inkling, Muse Glimmer and more — by benchmarks, licence tiers and hardware requirements. Find the model you can actually run and legally ship.
DeepSeek V4 is the MIT-licensed open-weight family that replaced the never-released R2, pairing a one-million-token context window with sub-dollar output pricing. This complete guide covers the V4 Pro 0813 and V4 Flash 0731 GA builds, their official benchmarks, the peak/off-peak billing change landing on 16 August 2026, and a practical framework for choosing between the two models.
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