SITUATION EXPLAINED: Opus 5.5 beats GPT-6 Astra on most benchmarks, and costs 40% less than Opus 5. • 66.4% on Terminal-Bench 4.0 against Astra's 57.9%, and 1846 on GDPval against Astra's 1542 • $4 input and $20 output, down from $5 and $25. Cache reads drop from $0.50 to $0.20, and output is 30% faster • Tested by METR and Frontier Design before release. Strongest alignment score Anthropic has posted, with 85% fewer attempts to cross containment boundaries than Opus 5 • It also often appears…

Claude@claudeai5h ago

Opus 5.5 is a major step up from Opus 5, leading on agentic coding, computer use, and knowledge work. https://t.co/MYI9JDAo1x