Claude Opus 5.5 and Sonnet 5.5 outpace rivals ahead of OpenAI Dev Day
Anthropic's Claude Opus 5.5 and Sonnet 5.5 reportedly outperform OpenAI's Sol and Astra, pressuring OpenAI to stack its Dev Day with 20+ releases. A blogger also claims access to Sonnet-5.5, suggesting a gradual rollout though unconfirmed.
2026-09-29 ~ 2026-09-29 · 3 related posts
- Episode 1: Anthropic Reportedly Set to Ship Sonnet/Haiku 5.5 Ahead of OpenAI DevDay(2026-09-26, 2 posts)
- Episode 2: Claude Sonnet 5.5 leak: gradual rollout underway, launch imminent(2026-09-27, 20 posts)
- Episode 3: Claude Opus 5.5 and Sonnet 5.5 outpace rivals ahead of OpenAI Dev Day(2026-09-29, 3 posts)
- Episode 4: Anthropic Launches Claude Sonnet 5.5: 30% Faster, Up to 30% Cheaper(2026-09-29, 58 posts)
- Sonnet-5.5 Reportedly Live for Select Users as Testing Begins — kimmonismus · 2026-09-29
- Opus 5.5 and Sonnet 5.5 reportedly outperform Sol and Astra ahead of OpenAI's 20+ Dev Day launches — hibzy7 · 2026-09-29
- Rumor: Sonnet 5.5 nearly matches Opus 5.5 as OpenAI plans 20+ Dev Day launches — hibzy7 · 2026-09-29