https://tokencost.app/blog/claude-opus-5-5-vs-gpt-6-sol-pricing TokenCost en 2026-09-28T00:00:00.000Z Claude Opus 5.5 lists at exactly twice GPT-6 Sol. Run both flat out and Opus costs 5.6x as much; run Opus at its own default and it outscores Sol's best setting for 5% more money, and past 272K tokens it is the cheaper bill.