New leader alert 🚨 Opus 5.5 takes the BuildingBench crown, while GPT‑6 Astra and Sol stand out on cost efficiency. 🏗️ 🥇 Opus 5.5 (max) jumps from Opus 5’s 74.5 to 86.8—the highest score yet, ahead of GPT‑6 Astra (ultra, 84.3) and Fable 5.1 (max, 81.4). 💸 GPT‑6 Astra stays close at a fraction of the cost: $7.05 per building vs. ~$45.47 for Opus 5.5. Just 2.5 points behind, at 84% lower cost. ⚡ GPT‑6 Sol takes a different tradeoff: • Ultra: 69.8 at ~$1.92/building • Max: 69.6 at ~$1.89/building Below GPT‑5.6 Sol’s 73.9, but roughly 75% cheaper than its $7.54/building. Both settings join the benchmark’s cost–quality frontier. Watch the leaderboard shift 👇 Building comparisons from Opus 5.5, GPT‑6 Astra, and GPT‑6 Sol in the thread!