---
type: "Evidence Item"
title: "Claude Fable 5 and Claude Mythos 5"
description: "Today we’re launching Claude Fable 5 : a Mythos-class 1 model that we’ve made safe for general use. Fable 5’s capabilities exceed those of any model we’ve ever made generally."
resource: "https://www.anthropic.com/news/claude-fable-5-mythos-5"
tags: ["appendix-iii", "benchmark", "anthropic"]
timestamp: "2026-06-09"
category: "benchmark"
publisher: "Anthropic"
cope_score: 88
confidence: 0.88
---

# Claude Fable 5 and Claude Mythos 5

# Claim

Today we’re launching Claude Fable 5 : a Mythos-class 1 model that we’ve made safe for general use. Fable 5’s capabilities exceed those of any model we’ve ever made generally available. It is state-of-the-art on nearly all tested benchmarks of AI capability, showing exceptional performance in software engineering, knowledge work, vision, scientific.

# Relevance

Appendix III, section one: model and benchmark capability evidence

# Oracle Verdict

Anthropic is describing a frontier or production capability that pushes directly on the thesis. The important signal is not the marketing language; it is the widening set of tasks now being routed through model-driven execution rather than ordinary software or headcount.

# Metadata

* Publisher: Anthropic
* Category: benchmark
* Sector: Software engineering
* Capability: Frontier model release and benchmark movement
* Cope score: 88
* Confidence: 0.88

# Related Concepts

* [Live evidence index](index.md)
* [Thesis](../thesis.md)

# Citations

[1] [Claude Fable 5 and Claude Mythos 5](https://www.anthropic.com/news/claude-fable-5-mythos-5)