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OpenAI launched GPT-6.1 Sol on September 29, which reportedly nearly matches GPT-6 Astra in performance while costing less. This launch was highlighted in the AI Weekly Daily Espresso, a digest of AI news. The information was provided to Daily readers, including those who might have missed an incremental Alert regarding the launch. This news is part of the AI Weekly Daily Espresso's October 1 edition, summarizing key AI developments.

This report highlights the mandatory rollover preserving the September 29 GPT-6.1 Sol launch for Daily readers who did not receive the incremental Alert, unlike other news sources.