Anthropic and OpenAI Launch Rival AI Models on Same Day in Pricing Battle

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On 22 September 2026, Anthropic and OpenAI released new AI models within an hour of each other, signalling an intensifying competition on both performance and price. Anthropic launched Claude Opus 5.5, its new flagship model, priced 20% lower than its predecessor at $4 per million input tokens and $20 per million output tokens. OpenAI responded with GPT-6 Sol and GPT-6 Luna, two budget-tier models positioned below its top GPT-6 Astra offering. Anthropic claims Opus 5.5 matches its higher-end Fable 5.1 model on most tasks while costing 40% less to run, with early testers at GitHub and Deloitte reporting efficiency gains in coding workflows. The simultaneous launches mark a notable shift in the enterprise AI market, where cost-per-task is increasingly becoming as important a competitive factor as raw model capability.

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