OpenAI's GPT-5.6 Sol ranks second in Intelligence Index and leads the Coding Agent Index at one-third the cost of Claude Fable 5, reshaping AI economics.

OpenAI's GPT-5.6 Sol targets 750 tokens per second via Cerebras wafer-scale compute, potentially outperforming GPU clusters by 15x in AI inference tasks.

OpenAI dropped GPT-5.6 in three tiers. But the real problem in AI coding has not changed.