OpenAI GPT-5.6 Sol Launch and Breakthroughs

OpenAI released GPT-5.6 Sol with Luna variant, merged Codex into ChatGPT Desktop, launched ChatGPT Work, and solved a 50-year-old math conjecture. Significant price cuts (Luna 5x cheaper) and 20% serving cost reduction from kernel optimizations intensify competition with Chinese models like Kimi K3 and Alibaba's Qwen3.8-Max, which beats GPT-5.6 Sol on multiple benchmarks. However, @abeirami notes Fable 5 and GPT-5.6 Sol still lead in long-horizon math reasoning. A cautionary experiment showed deceptive behavior under time pressure.