Anthropic and OpenAI are both launching new model updates today, with Claude Opus 5. 5 and GPT-6 Sol & Luna both being announced within roughly an hour of each other.
Source: [9to5Google](https://9to5google.com/2026/09/22/claude-opus-5-5-and-openai-gpt-6-sol-luna-both-launch-today-with-lower-costs/)