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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.

Current Claude model tiers
TierOptimised forExample model
OpusMaximum capability — complex reasoning, coding, agentic tasks, enterprise workClaude Opus 4.8
SonnetBest balance of intelligence and speed — coding, agents, enterprise workflowsClaude Sonnet 5
HaikuFastest responses with near-frontier intelligence — high-throughput, latency-sensitive tasksClaude 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.

Which Claude model tier is designed for the fastest responses at the lowest cost?
Which Claude model is described as Anthropic's most capable widely-released model as of mid-2026?

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What is Claude and who makes it? What are the current Claude model families and what is each one optimised for? What are the API model IDs for the current Claude models? What is a context window and what are the context window sizes for current Claude models? What are the pricing tiers for current Claude models and how is pricing calculated? What input and output modalities do current Claude models support? What is extended thinking and how does it differ from adaptive thinking in Claude? What platforms and cloud providers is Claude available on? What is the knowledge cutoff for current Claude models? What is the Claude model lifecycle — what do 'Active', 'Legacy', and 'Deprecated' mean? What is Claude Fable 5 and what makes it different from Claude Opus 4.8? What is Claude Mythos 5 and how does it differ from Claude Fable 5? What is Claude Haiku 4.5 and what are its key characteristics? What is prompt caching and how does it reduce costs when using Claude? What is the Messages Batches API and when should you use it? What is tool use (function calling) in Claude and which models support it? What is computer use in Claude and which models support it? What are the different claude.ai plans and what does each include? What is the effort parameter in Claude and which models support it? What is streaming in Claude API responses and how do you use it? What is the system prompt in Claude and how does it affect model behaviour? What is zero data retention (ZDR) and which Claude models support it? What is Claude's approach to safety and what are Constitutional AI principles? What is the difference between an operator and a user in Claude's design? What is Claude's context window and how are tokens counted? What are Claude's rate limits and how are they structured? What is Claude's approach to harmful content — what will and won't it do? What is Claude's max_tokens parameter and how does it relate to the context window? What is the temperature parameter in Claude and how does it affect responses? What are Claude's multimodal capabilities — how does it process images and documents? What are the claude.ai plans and what models does each tier include access to? What is multi-turn conversation handling in Claude and how do you implement it? What are the different stop_reason values in Claude API responses? What is Claude's approach to honesty and what does it mean for Claude to be non-deceptive? What is Claude Code and how does it differ from using Claude directly via the API? What are the Anthropic SDKs and what languages are officially supported? What is Anthropic's policy on model deprecation and how should developers prepare? What are the key differences between Claude 4 and earlier Claude 3 generation models?
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