kapynAI / Models

Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war

OpenAI and Anthropic drop a wave of flagship model releases alongside aggressive API price cuts. Anthropic launches Claude Opus 5.5 while OpenAI counters with GPT-6 Sol and GPT-6 Luna at half the cost of previous generation equivalents. These dramatic price reductions significantly lower the barrier for developers building production applications on frontier models.

Simon Willison·Sep 22, 2026

Opening Kapyn…