ANTHROPIC LAUNCHES CLAUDE OPUS 5.5, FIRST MODEL IN NEW 5.5 FAMILY Anthropic says Opus 5.5 performs at roughly the level of Claude Fable 5.1 on most tasks, while costing 40% less to run than Opus 5 and generating output 30%+ faster. Here’s everything you need to know: Opus 5.5 is Anthropic’s new flagship model, with major gains in agentic coding, computer use and knowledge work. Pricing: input_4M tokens • Output: $20/M • Cache reads: $0.20/M, 60% cheaper than Opus 5 Benchmark highlights: • Terminal-Bench 4.0: 66.4% vs. 52.3% for Opus 5 • CursorBench 4.0: 57.8% vs. 46.6% • GDPval-AA: 1846 vs. 1708 • OSWorld 2.0: 81.8% vs. 74.0% Anthropic says Opus 5.5 is especially strong on long-running coding work. In one test, it audited and fixed a 200K-line codebase in under 3 hours, versus more than 20 hours for Opus 5. Safety also improved. Anthropic says Opus 5.5 scored best among its recent models on its behavioral alignment audit and attempted to cross containment boundaries about 85% less often than Opus 5 or Mythos 5.1. Opus 5.5 is available now across Claude, AWS, Google Cloud and Microsoft Azure. Claude Sonnet 5.5 and Haiku 5.5 are coming in the next few weeks.