I'm not sure they're scared of Anthropic - they're doing great work but afaict running into some scaling issues and really focused on winning over developers at the moment.

If I was OpenAI (or Anthropic for that matter) I would remain scared of Google, who is now awake and able to dump Gemini 2.5 pro on the market at costs that I'm not sure people without their own hardware can compete with, and with the infrastructure to handle everyone switching to them tomorrow.