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Claude Opus 5.5 Takes No. 1 Spot on Arena's Code Arena: WebDev Leaderboard

September 23, 2026 at 22:47 EDT

Software Dev & Coding
AI Agents
Foundation Models

Anthropic's Claude Opus 5.5 has moved into first place on Arena's Code Arena: WebDev leaderboard, scoring 1818 points and opening a 26-point lead over GPT-6 Astra (Max). The result also marks a 126-point gain over the previous Claude Opus 5 (Max) score of 1692, strengthening Anthropic's position in AI-assisted web development.

Sep. 24, 2026 · Anthropic

Claude Opus 5.5 takes the coding lead

Claude Opus 5.5 (Max) reached 1818 points on Code Arena: WebDev, ahead of GPT-6 Astra (Max) and sharply above the previous Opus 5 score.

The leaderboard gap

1818

Claude Opus 5.5

1792

GPT-6 Astra

1692

Claude Opus 5

Columns are scaled to leaderboard scores, showing a narrow lead over GPT-6 Astra and a larger jump from Opus 5.

1818

Top WebDev score

+26

Points over GPT-6 Astra

+126

Points over Opus 5

Input price per MTok

Why developers care

The result points to stronger front-end construction, long coding sessions and agentic workflows where UI and implementation details must stay coordinated.

What it does not prove

The benchmark is centered on Next.js-based React applications, so it does not fully represent backend-heavy or multi-framework engineering work.

Deployment picture

Claude API→Amazon Bedrock→Google Cloud→Microsoft Foundry

The model ships with a 1M-token context window, 128K maximum output and always-on adaptive thinking.

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