Opus 5.5 is the first model in the Claude 5.5 family. Claude says it matches Claude Fable 5.1 on most tasks, while ClaudeDevs says it is about 30% faster and about 40% cheaper per task than Opus 5, alongside higher Claude Code session limits.
Pro, Max, and Team plans get higher five-hour usage limits, and subscription users receive a rate limit reset they can save and use whenever they choose.
Claude says Opus 5.5 performs at the level of Claude Fable 5.1 for most tasks and costs 40% less to run than Opus 5.
Over five days earlier in September 2026, a Chinese-speaking hacker stole hundreds of thousands of credit card details in attacks that cost $8,000 in total, Forbes reports.
Forbes reported that cybersecurity researchers breached OpenAI's internal system using Anthropic's Claude as part of a bug bounty program.
