In the week ending September 27, Claude Opus mentions rose 91.1% from the prior week, while GPT-6 mentions fell 42.1%.
The Opus move was concentrated in the latest week with the release of Opus 5.5 . Its tracked mentions had risen 11.9% in the week ending September 20, then accelerated to 91.1% in the week ending September 27. Over the full 14 days, the Opus series rose 114.0%.
GPT-6 moved in the opposite direction. Its weekly growth rate was +244.4% on September 20 before turning negative on September 27.
These figures come from TickerTrends tracking of filtered public GitHub commit-message mentions, measured at weekly Sunday observations through September 27, 2026.
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