OpenAI cuts GPT-5.6 Sol API prices by over 20%

OpenAI reduced GPT-5.6 Sol API pricing by over 20% for the next 3 months, with new rates of $4 per million input tokens and $20 per million output tokens (down from $5/$30). The promo runs at least through November 21, 2026, and applies to eligible ChatGPT Work and Codex credits, while Pro, Plus, and Business subscription usage remains unchanged.