Expired50% confidenceFactExact time
The window for using Claude Sonnet 4 for free or at low cost in the Claude chat interface ends on June 22, 2025, after which it will switch to API billing at a price twice that of Opus.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
Deep Dive into Claude Sonnet 4: Replicating Lovable with Just Two Prompts
bilibili万物深译6/15/2026
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