Expired50% confidenceFactExact time
The key turning point for Claude Code's performance improvement was the evolution of underlying models: Sonnet 4, Opus 4, and Opus 4.5
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
The Origin Story of Claude Code: From Internal Experiment to Programming Paradigm Shift
bilibiliClaudeAI6/6/2026
Related Claims
VerifiedClaude Code is powered primarily by Claude 4 Sonnet and Claude 4 Opus models80% similarUnverifiedOpus 4和Sonnet 4于去年5月发布，之后Claude Code增长进入指数级阶段75% similarUnverifiedClaude Code may default to calling a Sonnet-level model rather than Opus 473% similarUnverifiedOpus 4.5 performed excellently in the iteration phase, inheriting the essence of the original design and making meaningful changes at the detail level.73% similarVerifiedClaude Code is equipped with two models: Opus 4.6 and Sonnet 4.6.72% similar
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