OpenAI’s September 22 release of GPT-6 Sol publicly debuted its API pricing at $2 per million input tokens and $10 per million output tokens, a 50% cut from GPT-5.6 Sol’s promotional rates, alongside the lower-cost GPT-6 Luna tier. The announcement highlighted efficiency gains from improved caching and inference, positioning Sol for complex coding and agentic workflows while undercutting competitors like Claude Opus 5 on cost-per-task benchmarks. The model rolled out immediately to ChatGPT Work, Codex, and API users with a 1M-token context window and adjustable reasoning effort. Traders are tracking whether subsequent 6.1+ variants maintain or alter this output-token structure amid ongoing competition and potential long-context surcharges.