Anthropic and OpenAI both cut prices the same week, opening a three-way price war
Anthropic shipped Claude Opus 5.5 on September 22 at $4/$20 per million tokens, a 20% cut from Opus 5, with cache reads down 60% to $0.20/million and output speed up more than 30% — Anthropic says it matches Claude Fable 5.1 on most work. Hours apart, OpenAI released GPT-6 Sol and GPT-6 Luna at half the price of the outgoing GPT-5.6 tier, with Sol down to $2/$10 per million tokens. Both moves land the same week Google's Gemini 3.8 Live already undercut OpenAI's realtime voice pricing by more than half. None of the three labs is competing on capability alone anymore; the frontier now has a price floor that keeps dropping.

