Anthropic released Claude Opus 5.5 on September 22 with the first Opus price cut since 4.5: a fifth off the list price and 60 % off cached reads. About ninety minutes later OpenAI released GPT-6 Sol and Luna at half the price of the models they replace. If you pay for tokens, Opus 5.5 pricing is only half the story. The other half is how many tokens each model spends to finish a task, and there the independent numbers disagree with the launch posts. TL;DR Opus 5.5: ...