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Anthropic’s Claude Opus 5.5 leads WebDev AI rankings with 90% margin

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  • Anthropic’s Claude Opus 5.5 leads the Code Arena WebDev AI model rankings.
  • OpenAI held a 9.7% share as of September 24, 2026.
  • Anthropic’s model launched on the Claude API, Google Cloud and Microsoft Foundry.
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