Builders stream live tests of Sonnet 5.5 as the model appears to go live
kieranklaassen · x · 2026-09-29
Developer Kieran Klaassen started a 'LIVE: Sonnet 5.5' stream, in sync with Every and others, suggesting Anthropic's Sonnet 5.5 is now available and being tested hands-on in real time.
Official release details and benchmarks are still pending confirmation.
Related event: Sonnet 5.5 appears to launch as devs race to live-test it(2 posts)→
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