Kimi K3 wins DeepSWE pass@4 and cost; GPT-5.6 Sol leads pass@1

GPT-5.6 Sol leads DeepSWE pass@1 (72.7% vs 68.5%); Kimi K3 wins pass@4 (89.4% vs 85.8%) at $4.65 per rollout vs $8.37 — 2.8x more solves per dollar. A Kimi-first cascade escalating to Sol covers 108 of 113 tasks (~85.6%).