Claude Teases Sonnet 5.5 with Side-by-Side Demos

Claude's official account shared back-to-back demos comparing Sonnet 5 and 5.5 on identical prompts, including a JavaScript dinosaur-history animation and a physics ball test, fueling speculation that the new version is imminent.

2026-09-29 ~ 2026-09-29 · 2 related posts

• Sonnet 5.5 vs Sonnet 5: bouncing-ball physics tests from the same prompt — claudeai · 2026-09-29
• Claude official tweet shows Sonnet 5 vs Sonnet 5.5 side-by-side demo, hinting at launch — EricBuess · 2026-09-29