AI / Claude OPUS5 Interview questions

What is Claude Fable 5?

Claude Fable 5 is Anthropic's top-tier, frontier-intelligence model, sitting above the Opus tier and released as part of the same Mythos-tier generation as Claude Mythos 5.

It shares its underlying model with Claude Mythos 5 but includes additional safety measures specific to biology, cybersecurity, and LLM R&D domains, reflecting a more cautious release posture for Anthropic's most capable model.

Claude Opus 5 is explicitly positioned as coming close to Fable 5's intelligence on many everyday tasks at roughly half the price, though Anthropic still recommends Fable 5 for more demanding or longer-running autonomous projects.

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Claude Fable 5 sits, in Anthropic's model tiers, at the: top/frontier tier, above Opus

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entry-level tier below Haiku

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exact same tier as Opus, with no distinction

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Fable 5 differs from Mythos 5 mainly by having: additional safety measures for biology, cybersecurity, and LLM R&D

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a lower price than Opus 5

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a completely different underlying model with no shared capabilities

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More Related questions...

What is Claude Opus 5? When was Claude Opus 5 released? What is the pricing for Claude Opus 5? What is the API model string for Claude Opus 5? What is Claude Fable 5? Describe the effort parameter in Claude Opus 5? What is Fast mode for Claude Opus 5? What is the context window size for Claude Opus 5? What is the maximum output token limit for Claude Opus 5? Define thinking (reasoning) in the context of Claude Opus 5? What is the prompt caching minimum for Claude Opus 5? Describe mid-conversation tool changes in Claude Opus 5? What is automatic fallback on the Claude API? List the platforms where Claude Opus 5 is available? What is Claude Opus 5's position in Anthropic's Claude Max and Claude Pro plans? What is Claude Mythos 5? How do you enable thinking on Claude Opus 5? What is the default effort level for Claude Opus 5? Describe subagent delegation in Claude Opus 5? How do you migrate an application from Claude Opus 4.8 to Claude Opus 5? What is the difference between Claude Opus 5 and Claude Opus 4.8? How does Claude Opus 5 compare to Claude Fable 5 in capability and price? Why is thinking on by default a breaking change when migrating to Claude Opus 5? What is the difference between the effort parameter and response verbosity in Claude Opus 5? When should you use Fable 5 instead of Opus 5? How does Claude Opus 5's self-verification behavior differ from Claude Opus 4.8? What is the difference between disabling thinking on Opus 5 vs Fable 5? Why does max_tokens behave differently on Claude Opus 5 compared to Claude Opus 4.8? How does Claude Opus 5's narration behavior affect agentic prompting? What is the difference between Opus 5 and Opus 4.8 rate limits? When should you use Fast mode for Claude Opus 5? How does Opus 5 handle disabling thinking at xhigh or max effort? What is the difference between Claude Opus 5's Priority Tier support and Claude Opus 4.8's? Why should you avoid carrying over "double-check your work" instructions to Claude Opus 5? How does Claude Opus 5's prompt caching minimum affect short system prompts? How do Opus 5 and Fable 5 differ in calibrating thinking depth? When should you scope, rather than remove, a verification instruction? How does Opus 5's release cadence compare to Opus 4.5 and 4.1? Explain how the effort parameter governs Claude Opus 5's output beyond just reasoning? How can you optimize prompts when migrating from Opus 4.8 to Opus 5? How do you troubleshoot an Opus 5 response truncated at max_tokens? Explain the execution flow of mid-conversation tool changes in Claude Opus 5? How can you optimize agentic narration behavior in Claude Opus 5 through prompting? Which is better for long-horizon autonomous coding: Opus 5 or Fable 5? How do you troubleshoot an HTTP 400 error disabling thinking on Opus 5? Explain the tradeoffs of using Claude Opus 5's Fast mode versus standard mode? How can you optimize cost migrating high-volume workloads to Opus 5? Explain the artifacts that can appear in Claude Opus 5's output when thinking is disabled? How do you troubleshoot over-verification behavior in a Claude Opus 5 agentic workflow? Explain how Opus 5's positioning versus Fable 5 reflects Anthropic's strategy?

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