OpenAI cuts GPT 5.6 prices 20-80%, cost of GPT 5.4 intelligence drops 13x

OpenAI's GPT 5.6 price cut ranges 20-80%, with the cost of GPT 5.4-level intelligence dropping 13x in 4 months due to recursive self-optimization. Self-optimization reduced serving costs by 20%, and speculative decoding improved token efficiency by over 15%.