no. of days between model releases:
OpenAI
GPT-3 → GPT-4: 1,006 days
GPT-4 → GPT-5: 877 days
GPT-5.6 Sol → GPT-6 Astra: 56 days
Anthropic
Claude 3 → Claude 4: 444 days
Claude 4 → Claude 5: 383 days
Claude 5 → Claude 5.1: 84 days
the release cycle compression is insane.
