Claude

Anthropic’s lineup got two new names recently — Claude Fable 5 and Claude Mythos 5 — sitting above an already-strong Opus tier (Opus 4.6, 4.7, and 4.8). The marketing pages don’t really tell you what to use when, and the API differences are significant enough that a naive model-string swap will break production code. This post is the guide I wish existed: what these models are, how they relate to each other, exactly what changes at the API level, what changes behaviorally, and how to decide which one your workload actually needs. ...

Anthropic has just released Claude Opus 4.5, and it’s a game-changer for software engineers, enterprises, and anyone working with AI-powered tools. Released on November 24, 2025, this model sets new benchmarks in software engineering, agentic capabilities, and enterprise-grade performance. If you’re building software, analyzing complex systems, or working with autonomous agents, Claude Opus 4.5 deserves your attention. Here’s everything you need to know. What Makes Claude Opus 4.5 Special? Claude Opus 4.5 isn’t just an incremental update-it represents a significant leap in AI capabilities, particularly for technical and complex tasks. ...