Arena ranks Inkling 2 Small #31 in Agent Arena, the top US open-weights model once its weights ship

Arena says Thinking Machines' Inkling 2 Small landed #31 overall in its Agent Arena, with a net improvement of +0.08%, about 18 percentage points above Inkling Small, which was #56 at −18%. Arena says that with the open weights Thinking Machines has promised, it would be the #1 US open-weights model in the arena.

Among all open models, Arena says it would rank #9: 0.5 points behind Kimi K3 (Max) at #5 and within 2.0 points of DeepSeek-V4.1-Flash-20261017 (Max) at #3. Its median cost per task is $0.25, which Arena says is 70% lower than Kimi K3 (Max). These are Arena's figures.