Anthropic and OpenAI Cut AI Prices on the Same Day in Rare Pricing Showdown

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On September 22, 2026, Anthropic and OpenAI released competing AI models within hours of each other, both accompanied by significant price reductions — an unprecedented same-day rivalry. Anthropic launched Claude Opus 5.5 at $4 per million input tokens and $20 per million output tokens, a 20% drop from its predecessor, with cache read costs slashed by 60%. OpenAI countered with GPT-6 Sol at $2 input and $10 output per million tokens, and the budget-tier GPT-6 Luna at just $0.10 input and $0.50 output — roughly half the cost of the GPT-5.6 models they replace. For a typical cache-heavy agentic workload, GPT-6 Sol works out to roughly 47% cheaper than Opus 5.5, while Luna is nearly negligible in cost. Both companies described their new prices as permanent, signaling a broader industry shift toward competing on cost rather than benchmark performance alone.

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