Verified80% confidenceFactExact time

Claude Code is powered primarily by Claude 4 Sonnet and Claude 4 Opus models

11

Sources

80%

Confidence

Medium-term (~90 days)

Relevance

7/2/2026

First Seen

Valid until: 9/30/2026

Sources

Claude Code vs Regular AI Chat: An In-Depth Comparison Across Five Dimensions

bilibili重生之我不是程序员6/11/2026

Related Claims

UnverifiedClaude Code may default to calling a Sonnet-level model rather than Opus 480% similar UnverifiedThe key turning point for Claude Code's performance improvement was the evolution of underlying models: Sonnet 4, Opus 4, and Opus 4.580% similar

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