anthropic/claude-fable-5Claude Fable 5 is Anthropic’s proprietary AI model, released Jun 9, 2026. It costs $10/M input and $50/M output tokens, and handles a 1M-token context window. Its strongest use case is coding, where it ranks in the 99th percentile of the models Model Beat tracks.
Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding.
Scores on standardized evaluations. Higher is better — and rank shows where Claude Fable 5 lands among all models tracked on Model Beat.
Graduate-level scientific reasoning
Frontier of human expert knowledge
Common-sense trick questions
Factual accuracy & hallucination
Novel ML problem-solving
Scientific research coding
Human-rated web development
Olympiad-qualifier math
Multi-step agentic tasks
Tool-agent-user reliability
Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding.
Claude Fable 5 is an AI model developed by Anthropic, part of the Claude family, released Jun 9, 2026.
Claude Fable 5's list price from Anthropic is $10 per million input tokens and $50 per million output tokens.
Claude Fable 5 supports a context window of up to 1M tokens.
On standardized evaluations tracked by Epoch AI, Claude Fable 5 scores 53.3% on Humanity's Last Exam, 60.2% on SciCode, 81.9% on SimpleBench.
Claude Fable 5 is a proprietary model (API access), available through its provider's API rather than as a downloadable open-weight model.
Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Jul 30, 2026.