Claude Fable 5
Claude Fable 5 is a model you reach through an API — too large to self-host, so this page covers what it does, how to access it, and what to run locally instead.
You don't run Claude Fable 5 locally
Access is through the hosted API.
Jun 9, 2026 Anthropic release: the first publicly available Mythos-class model, a tier above Opus 4.8. Anthropic reports it took the open coding lead on their own benchmarks (precise scores not published in primary-source text). Parameter count undisclosed (cloud API). Cloud only.
Strong local alternatives
More Claude models
Frequently asked questions
Can I run Claude Fable 5 locally?
Not realistically. Claude Fable 5 is a vendor-undisclosed-size model; a Q4-class build would need far beyond any consumer machine. The hosted API or a smaller open model is the practical path.
How do I access Claude Fable 5?
Through the vendor-hosted API. See the official source linked on this page.
What is the best local alternative to Claude Fable 5?
Qwen3 235B A22B is the strongest local model we track (235B). It runs on a single high-memory Mac or GPU; see its page for exact hardware.
Cite this page
ModelFit: Claude Fable 5 — specs, memory math and hardware verdicts. https://modelfit.io/models/claude-fable-5/ (dataset updated 2026-09-03, CC BY 4.0).