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Opus 5.5 on launch day vs today: same GTA 6 India prompt compared

The same open-world GTA 6 India prompt was tested with Opus 5.5 on launch day and again after Sonnet 5.5's release, and the author says the difference in the output is clearly visible.

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@BuildFastWithAIArchived 2026.10.03Originally posted 2026.10.02
Build Fast with AI @BuildFastWithAIOriginally posted 2026.10.02
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Anthropic launched Sonnet 5.5, made it as good as Opus 5.5, then went ahead and nerfed Opus 5.5. Crazy marketing. We tested Opus 5.5 on launch day and again today, on the same open-world GTA 6 India prompt. Launch day vs today below. The difference is clearly visible.

x.com/buildfastwithai/status/2105866257174298841Archived 2026.10.03 10:14