OpenAI and Anthropic repeatedly slash LLM API prices through mid-2026
Between June and September 2026, OpenAI and Anthropic each cut prices on multiple models: OpenAI dropped GPT-5.6 Luna pricing by 80% and GPT-5.6 Sol by about 20% for three months, while Anthropic made its temporary Claude Sonnet 5 launch pricing permanent and cut cache-read costs by 75% on the newly released Fable 5.1. The moves followed mixed reception to some new releases, including Claude Sonnet 5 and Opus 5, even as benchmark claims for some models reportedly exceeded larger competitors.