The Rundown AI8 min read
The pacing era's first launch day
Anthropic and OpenAI launch competing AI models 90 minutes apart, with Claude Opus 5.5 and GPT-6 variants reshaping the frontier in the pacing era.
By Jennifer Mossalgue, Rowan Cheung, Shubham Sharma, Zach MinkThe Rundown AI Blog
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Originally published by The Rundown AI Blog on Sep 23, 2026.
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