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Claude Sonnet 5.5 rumored to launch next week

A leak claims Sonnet 5.5 is in grey testing in Claude Code with some accounts already routed to it, beats GPT-6 Sol in most areas, keeps Sonnet 5 pricing, and may launch around OpenAI DevDay.

Pankaj Kumar
@pankajkumar_devArchived 2026.09.28Originally posted 2026.09.27
Claude Sonnet 5.5 rumored to launch next week
Pankaj Kumar @pankajkumar_devOriginally posted 2026.09.27
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Claude Sonnet 5.5 Coming Next Week - Sonnet 5.5 is in grey testing in Claude Code, with some accounts already routed to it. Partners also got access to a newer checkpoint and seem satisfied with the quality, sending feedback to Anthropic. - So I think its coming next week, most likely Tuesday or Thursday, probably Tuesday because of OpenAI DevDay. - Its better than GPT-6 Sol in most things and a huge step up from Sonnet 5. - Insanely fast, efficient, and much more natural , Claude's slightly AI-ish writing style seems much better with this version. - Same pricing as Sonnet 5, no change.

This post quotes another post: x.com/lyraxana/status/2103945384284582270

x.com/pankajkumar_dev/status/2104079466381160809Archived 2026.09.28 09:57