Create an interactive fall foliage simulator as a polished browser experience. Show a grove of trees whose leaves transition from green through gold, orange and red, then fall with believable wind and accumulate on the ground. Include season progression and wind controls, pause/reset, and a beautiful coherent composition. Deliver a working HTML artifact, not just an explanation. Source inspiration: https://x.com/claudeai/status/2104674987164782598 (Sonnet 5 vs Sonnet 5.5 fall foliage simulator; observed 687K views, 7.8K likes on 2026-10-01). This is an adapted reproduction brief based on the public post description, not the original verbatim prompt. The current comparison uses the models selected in Evals; do not claim to reproduce the original model versions.

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Published Oct 1

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Create an interactive fall foliage simulator as a polished browser experience. Show a grove of trees whose leaves transition from green through gold, orange and red, then fall with believable wind and accumulate on the ground. Include season progression and wind controls, pause/reset, and a beautiful coherent composition. Deliver a working HTML artifact, not just an explanation.

Source inspiration: https://x.com/claudeai/status/2104674987164782598 (Sonnet 5 vs Sonnet 5.5 fall foliage simulator; observed 687K views, 7.8K likes on 2026-10-01). This is an adapted reproduction brief based on the public post description, not the original verbatim prompt. The current comparison uses the models selected in Evals; do not claim to reproduce the original model versions.

Claude Opus 5.5

GPT-6 Astra

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TaskCreate an interactive fall foliage simulator as a polished browser experience. Show a grove of trees whose leaves transition from green through gold, orange and red, then fall with believable wind and accumulate on the ground. Include season progression and wind controls, pause/reset, and a beautiful coherent composition. Deliver a working HTML artifact, not just an explanation. Source inspiration: https://x.com/claudeai/status/2104674987164782598 (Sonnet 5 vs Sonnet 5.5 fall foliage simulator; observed 687K views, 7.8K likes on 2026-10-01). This is an adapted reproduction brief based on the public post description, not the original verbatim prompt. The current comparison uses the models selected in Evals; do not claim to reproduce the original model versions.

Create an interactive fall foliage simulator as a polished browser experience. Show a grove of trees whose leaves transition from green through gold, orange and red, then fall with believable wind and accumulate on the ground. Include season progression and wind controls, pause/reset, and a beautiful coherent composition. Deliver a working HTML artifact, not just an explanation. Source inspiration: https://x.com/claudeai/status/2104674987164782598 (Sonnet 5 vs Sonnet 5.5 fall foliage simulator; observed 687K views, 7.8K likes on 2026-10-01). This is an adapted reproduction brief based on the public post description, not the original verbatim prompt. The current comparison uses the models selected in Evals; do not claim to reproduce the original model versions.