Rumors: Anthropic Sonnet 5.5 Nears Release, Possibly Monday

Multiple leaks suggest Anthropic partners have received a new Claude Sonnet 5.5 checkpoint with improved quality, rumored to beat GPT-6 Sol on several benchmarks. The model is reportedly set for release as soon as Monday.

2026-09-27 ~ 2026-09-27 · 2 related posts

• Rumor: partners got a better Claude Sonnet 5 checkpoint, release expected next week — kimmonismus · 2026-09-27
• Rumor: Sonnet 5.5, Already Said to Beat GPT-6 Sol, Got a Last-Minute Upgrade Before Monday Release — ResultBackground2450 · 2026-09-27