September 22, 2026

OpenAI ships GPT-6 Sol and Luna, cutting API pricing roughly 50%

OpenAI released two models: Sol as the frontier reasoning tier and Luna as the fast, low-cost tier, published alongside benchmarks, model documentation and a refreshed prompt-caching guide. API pricing fell roughly 50%, resetting the cost-per-token baseline that enterprise AI business cases written in H1 2026 were built on.