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GPT-6.1 Terra vs. Claude Opus 5.5: Cheaper and faster in three tests at max effort

The New Stack By Jessica Wachtel Oct 31, 2026 · 9:00 AM 8 min read 0 views 0 comments

OpenAI launched GPT-6.1 Terra on October 26, and included two direct comparisons with Opus 5.5 in its marketing materials. It

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