Kimi K3 vs GPT-5.6 Sol on DeepSWE: Cost, Coding, and Routing

On DeepSWE, GPT-5.6 Sol edges Kimi K3 at pass@1 (72.7% vs 68.5%), but Kimi K3 wins pass@4 (89.4% vs 85.8%) at $4.65 per rollout vs Sol's $8.37 — 2.8x more solved tasks per dollar. Routing between the two models reaches ~85.6%, covering 108 of 113 tasks.