FrontierThe story, in brief
Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war
Three major model releases in 72 hours: Anthropic's Opus 5.5, OpenAI's GPT-6 Sol and Luna variants — and pricing just collapsed.
The KeyNews take
Why it matters
Frontier labs are shipping upgraded reasoning and multimodal models in rapid succession, signaling acceleration in the capability race. Simultaneous price cuts reshape AI economics for practitioners.
The key facts
6 to knowClaude Opus 5.5 released by Anthropic
OpenAI released GPT-6 Sol variant
OpenAI released GPT-6 Luna variant
Price war triggered — multiple model pricing cuts
Published Sep 22, 2026 — breaking/same-week
Concurrent releases from two frontier labs within 72 hours
Go to the source
Simon Willisonsimonwillison.net