Anthropic ships Fable 5.2 and Mythos 5.2 at 20% lower price

single source· 1 articles · confidence: medium · first seen 2026-11-09 23:58 UTC

What this means for you

If you send image or long-output work through Fable at max effort, test it before shipping: one run spent 128,000 tokens and returned nothing. Otherwise the price is the news — $8/$40 is a fifth off Fable 5.1 — and llm-anthropic 0.31 already exposes both models.

Anthropic released Fable 5.2 and Mythos 5.2 on 9 November. Fable 5.2 costs $8 per million input tokens and $40 per million output, 20% below Fable 5.1's $10 and $50. Artificial Analysis ranks it first; no evaluation date or harness details are given. Anthropic says it solved two open problems in black-hole physics, a claim nothing in the source tests. Simon Willison added both models to his llm-anthropic plugin (0.31) and reports that at the highest of its five effort levels (how much computation it spends before answering), max, it spent 128,000 tokens without returning an image — a failure he also saw on Opus 5.5.

Key facts

  • ·Anthropic released two models, Fable 5.2 and Mythos 5.2, on 9 November 2026. source
  • ·Fable 5.2 is priced at $8 per million input tokens and $40 per million output, against $10 and $50 for Fable 5.1 — a 20% cut. source
  • ·Artificial Analysis ranks Fable 5.2 first; the article gives no evaluation date or harness for that ranking. source
  • ·llm-anthropic version 0.31 adds both new models to the plugin. source
  • ·At the max effort level, Fable 5.2 spent 128,000 tokens without returning an image, a fault the author also observed on Opus 5.5; Fable 5 and 5.1 had returned images at max. source
  • ·The model offers five effort levels: low, medium, high, xhigh and max. source

What the sources say

  • Simon Willison (press) — Plugin release notes that also record pricing, a leaderboard position and a reproducible max-effort failure.

Sources

The original reporting. Follow these — they did the work.

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