AI / Claude Models Basics Interview Questions
What are the current Claude model families and what is each one optimised for?
Claude models are organised into three tiers — Opus, Sonnet, and Haiku — representing a capability-speed-cost spectrum. As of mid-2026 the current flagship generation is Claude 4/5, alongside the newly released Claude Fable 5.
| Tier | Optimised for | Example model |
|---|---|---|
| Opus | Maximum capability — complex reasoning, coding, agentic tasks, enterprise work | Claude Opus 4.8 |
| Sonnet | Best balance of intelligence and speed — coding, agents, enterprise workflows | Claude Sonnet 5 |
| Haiku | Fastest responses with near-frontier intelligence — high-throughput, latency-sensitive tasks | Claude Haiku 4.5 |
Additionally, Claude Fable 5 sits above the Opus tier as Anthropic's most capable widely-released model, described as providing next-generation intelligence for long-running agents.
Claude Mythos 5 shares Fable 5's specifications but is offered only through the invitation-only Project Glasswing programme for defensive cybersecurity workflows.
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