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Anthropic's Claude Sonnet 5.5 Reaches No. 4 on Arena WebDev Leaderboard With 1,699 Score

September 29, 2026 at 14:19 EDT

Foundation Models
AI Agents
Software Dev & Coding

Anthropic's Claude Sonnet 5.5 has entered the top tier of web-development model rankings, placing No. 4 on Code Arena | WebDev with a 1,699 score after its September 28 release. The result strengthens the case for Sonnet 5.5 as a cost-efficient coding model: the tested High configuration sits near the top of a leaderboard led by more expensive or flagship systems, while Anthropic lists the model at $2 per million input tokens and $10 per million output tokens.

Sep. 29, 2026 · Anthropic

Claude Sonnet 5.5 Enters The WebDev Top Four

Sonnet 5.5 High reached No. 4 with a 1,699 WebDev score, turning the latest leaderboard move into a price-performance story for coding agents.

WebDev rank

No. 4

Score

1,699

Votes

1,205

Price per MTok

$2/$10

How close is the top cluster?

Vertical block columns scale each model score against the leading 1,820 result.

1,820

Opus 5.5 Max

1,792

GPT-6 Astra Max

1,753

Fable 5.1 Max

1,699

Sonnet 5.5 High

The signal: frontier-like coding at Sonnet pricing

Speed: 30%+ faster output than Sonnet 5.

Cost: up to 30% less per task in testing.

Scale: 1M-token context window.

Positive read

Developers get a near-top WebDev score with lower Sonnet-tier token pricing and faster iteration.

Caution

The rank range overlaps nearby models, and Opus remains stronger for complex open-ended judgment work.

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