As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/p/x-arcprize-2119871080525373922/

# “Claude Fable 5.2 from @AnthropicAI on ARC-AGI (Verified): - ARC-AGI-3: 97.7%, $18.6K…”

ARC Prize (@arcprize), X, 2026-11-09.
Source: https://x.com/arcprize/status/2119871080525373922

## Archived text

> Claude Fable 5.2 from @AnthropicAI on ARC-AGI (Verified):
> 
> - ARC-AGI-3: 97.7%, $18.6K (provider adapter harness), 81.2%, $21.9K (standard harness)
> - ARC-AGI-2: 93.8%, $0.98/task
> - ARC-AGI-1: 98.5%, $0.36/task
> 
> Fable 5.2 sets a new high score on ARC-AGI-3 in the standard harness.

Archived 2026-11-12 via fxtwitter (unofficial).
Counts: 102,475 views, 1,234 likes, 91 reposts, 42 replies (at fetch time)
Media: https://pbs.twimg.com/media/HWtLg2JWUAALA3b.jpg?name=orig

## Cited in

- 2026-11-09: [Anthropic releases Claude Fable 5.2 and Claude Mythos 5.2](https://postcutoff.com/e/2026-11-09-claude-fable-5-2-mythos-5-2/)