OpenAI and Anthropic cut their LLM prices by up to 80% within a few months. Why?
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Summary
Between June and late September 2026, OpenAI and Anthropic cut effective prices sharply: GPT-5.6 Luna fell 80%, Opus 5.5 costs 40-60% less than Opus 5, and GPT-6.1 Sol is about 75% cheaper than the prior Sol. Anthropic says Opus 5.5 needs less compute to serve. The author attributes the cuts mainly to open-weight competition, with 29 providers hosting DeepSeek V4.1 Flash on OpenRouter. Several figures, including Vercel's cost index and the benchmark scores, were not verified.