Anthropic's 15-Day 5.5 Blitz Upends OpenAI's Lead

Anthropic released nearly its entire 5.5 model family in just 15 days, jumping four versions from 5.1 to deliver astra-level capability at lower cost, upending OpenAI's seemingly unassailable position within a month.

2026-10-09 ~ 2026-10-09 · 2 related posts

• Anthropic rolled out nearly its whole 5.5 family in 15 days, flipping the narrative on OpenAI — haider1 · 2026-10-09
• Anthropic's four-version leap to Opus 5.5 undercuts OpenAI's Astra moment — haider1 · 2026-10-09