Anthropic releases Claude 4.0+ Sonnet
19
2kṀ3550
2026
September 27, 2025
51%
June-August 2025
30%
September-November 2025
12%
December 2025-February 2026
3%
March-May 2026
2%
June-August 2026
1.5%
September-December 2026

when will Sonnet 4.0 get an upgrade?

any month with a Sonnet release >4.0 will resolve as yes, such as Claude 4.1 Sonnet or Claude 4.5 Sonnet

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