Claude Fable 5
Anthropic's frontier agentic coding and knowledge-work flagship. Leads Artificial Analysis Intelligence Index and SWE-bench Verified in this snapshot.
When to use it
Hard coding agents, long computer-use sessions, and high-stakes knowledge work.
Watch-outs
Premium pricing; availability can lag announcements. Overkill for simple chat.
Benchmarks
Human preference ranking from blind pairwise chats. Higher is better; top frontier models cluster within ~50–80 Elo.
Artificial Analysis composite across agents, coding, science, and general evaluations (v4.1 weighting).
Percent of real GitHub issues resolved end-to-end. Strong signal for agentic coding usefulness.
PhD-level science questions. Separates frontier reasoning models better than saturated knowledge tests.
Harder multi-choice knowledge/reasoning suite than classic MMLU.
Frontier closed-ended academic difficulty across many domains.
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