Claude Fable 5.1 vs Claude Mythos 5.1: What's the difference?

Anthropic always talks about how incredible Claude Fable and Claude Mythos are, and marketing is the biggest reason for the company to advertise them so much.

Fable, Opus, or Codex: Which one to choose? — The answer found after counting 2,100 responses on the day after the announcement: 'Use Opus 5.5 as the main, call Fable, and ...

Opus 5.5 (the new default model released on September 22), and Codex (OpenAI's coding AI). Which one should you actually use?I'll give you the answer first. Use Opus 5.5 as the main engine. Call Fable ...

Claude down update: Thousands complain of outage as Mythos 5.1, Fable 5.1, Opus 5 face issues; what happened, how to fix

Anthropic's AI Claude was reportedly down for thousands of users on September 21 with many complaining online.
Technobezz

Claude Elevated Errors for Multiple Models Now Resolved

Claude says it is investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5, and ...

Comparing Claude Code Fable and GPT-5.6 Sol | Which one is actually recommended? How to wisely use the 'strongest AI'

"Claude Code's Fable or GPT-5.6 Sol—which one should I actually use?"Anyone who uses generative AI on a daily basis has ...

Anthropic's AI Claude was reportedly down for thousands of users on September 21 with many complaining online.

Anthropic's AI Claude was reportedly down for thousands of users on September 21 with many complaining online.
THE DECODER

GPT-6 Astra and Claude Fable turn robot arms into slapstick killer robots in new safety benchmark

Leading AI models usually attempt dangerous tasks rather than refuse them when controlling a robot, according to the RoboHarm ...

[Announced 9/21] Grok 4.7 Pricing | Jobs where you lose money by delegating, even at 1/8th the cost of Claude

The price of output tokens is one-eighth that of Claude Fable 5.1. This is about Grok 4.7, which was announced on September ...