🤖 Claude Opus 5.5 cuts cost by 40%

Anthropic says the model is 40% cheaper than Opus 5 and reaches Claude Fable 5.1 in most work tasks. A tester moved a 680,000-line codebase in under a day. Another test took 3 hours to review and fix 200,000 lines, versus more than 20 hours for Opus 5.

The main upgrade targets agentic coding. Opus 5.5 scored 66.4% on Terminal-Bench 4.0 and responds more than 30% faster, while needing fewer steps for long tasks.

Input now costs $4 per million tokens, output costs $20. Cached input fell to $0.20. Fast Mode can run up to 2.5 times faster, and agents now face an action check before execution. Sonnet 5.5 and Haiku 5.5 are next.

📊@tech