
Claude 4 Opus & Sonnet: All You Need to Know About Anthropic’s Newest AI Models
On May 22, 2025, Anthropic unveiled its Claude 4 series—two next-generation AI models designed to redefine what virtual collaborators can do. The release includes Claude Opus 4, the company’s most powerful model to date, and Claude Sonnet 4, a leaner, faster option optimized for everyday use. Together, these models mark a turning point. While previous updates added incremental improvements, Claude 4 is a full-scale leap toward AI that can reason, remember, and operate autonomously over long periods. With extended tool use, parallel reasoning, and record-breaking performance on real-world coding benchmarks, Claude 4 sets a new bar for what large language models can achieve. Claude 4 Sonnet is now available in Fello AI, alongside the latest […]