Anthropic launched Claude Opus 5.5 on Tuesday evening at 4 dollars per million input tokens and 20 dollars per million output tokens, representing a 20% reduction from Opus 5, with savings estimated at 40% on typical workloads. OpenAI responded within an hour with GPT-6 Sol priced at 2 and 10 dollars and Luna at 0.10 and 0.50 dollar, both half the cost of their GPT-5.6 counterparts. This price war comes three weeks before Anthropic’s planned Nasdaq IPO in mid-October. An AI agent costing 100 dollars per day on Opus 5 would drop to approximately 60 dollars on Opus 5.5, according to Anthropic’s figures. OpenAI has not yet integrated Sol and Luna into ChatGPT’s main interface.
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