Artificial Analysis puts Claude Opus 5.5 (max) at $5.98 per Intelligence Index task
The estimate is close to $5.86 for Opus 5 (max). Higher token use is offset by a 20% base-price cut and a further reduction in cache-read pricing to $0.20.
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View all AI newsClaude Opus 5.5 is available as the first Claude 5.5 model
Anthropic said on September 22, 2026, that Claude Opus 5.5 is available. Claude says it performs at the level of Claude Fable 5.1 for most tasks and costs 40% less to run than Opus 5.
Forbes reports hacker used DeepSeek, Kimi and older Claude against as many as 100 organizations
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.
Security researchers used Anthropic's Claude to breach OpenAI, Forbes reports
Forbes reported that cybersecurity researchers breached OpenAI's internal system using Anthropic's Claude as part of a bug bounty program.