OpenAI cuts developer pricing for frontier GPT-5.6 Sol model by more than 20%

OpenAI cut developer pricing for its frontier GPT-5.6 Sol model on 21 August 2026, effective for the next three months. Standard short-context pricing moves to $4 per 1M input tokens and $20 per 1M output tokens, down from $5 and $30, a 20% cut on input and about 33% on output. The reduction applies to the API and is rolling out across eligible plans for Codex credits and ChatGPT Work, while Pro, Plus and Business subscription pricing is unchanged. OpenAI cut its mid-tier GPT-5.6 Terra model by 20% and the lower-cost Luna model by 80% late last month.