Claude Fable 5.2

Anthropic
Claude Fable 5.2 launch post cover

Cost/1M tokens

input
$8.00
cached
$0.20
output
$40.00
cache write
$10.00
Context
1Mtokens
Listed
5d ago

Anthropic's Claude Fable 5.2 is an upgrade of Claude Fable 5.1 and shares an underlying model with Claude Mythos 5.2, with cybersecurity and biology safeguards that let Anthropic offer it to all users. Anthropic says it generates output up to 30% faster than Fable 5.1 and uses fewer tokens on challenging tasks. It is built for demanding, open-ended technical work such as coding, agentic tasks, and research.

How it compares

Score vs. cost

Each model at its best score · Dashed: the best score at each cost

  • Anthropic
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Level

PremiumA premium line the lab sells above its own flagship, for the hardest work at the highest price.

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Additional source evidence
Source model
anthropic/claude-fable-5-2
Source family
claude-fable
Last updated
2026-11-09
Knowledge cutoff
2026-06
Model context
1M
Model output limit
128K
Open weights
No
File attachments
Yes
Reasoning
Yes
Tool calling
Yes
Temperature control
No

Published benchmarks

BenchmarkScoreEvaluation detailsEvidence
FrontierCode49.1 · scorexhigh effort; safeguards on · 2.0 · 2026-11-09Source
FrontierSWE69.9 · scorehighest available effort; safeguards on · 2 · 2026-11-09Source
AutomationBench51.4 · scorehighest available effort; safeguards on · 2026-11-09Source
Terminal-Bench-Science74.6 · scorehighest available effort; safeguards on · 0.1 · 2026-11-09Source
WANDR82.1 · relaxed scorehighest available effort; safeguards on · 2026-11-09Source
OSWorld89.3 · partial scoreoffline set · highest available effort; safeguards on · 2.1 · 2026-11-09Source
RoboDojo Sim64.9 · average success ratemax effort; internal run · 2026-11-09Source
AA-Briefcase66.1 · rubric scorehighest available effort; safeguards on · 1.1 · 2026-11-09Source
AA-Briefcase1785 · Elohighest available effort; safeguards on · 1.1 · 2026-11-09Source
Remote Labor Index41.3 · scorehigh effort; safeguards on · 2026-11-09Source
Humanity's Last Exam74.2 · scorewith tools; highest available effort; safeguards on · 2026-11-09Source
Chartography73.4 · scoreno tools; highest available effort; safeguards on · 2026-11-09Source
Complete source record (JSON)
{
  "id": "anthropic/claude-fable-5-2",
  "name": "Claude Fable 5.2",
  "description": "Claude model for demanding reasoning and long-horizon agentic work",
  "family": "claude-fable",
  "last_updated": "2026-11-09",
  "knowledge": "2026-06",
  "attachment": true,
  "reasoning": true,
  "tool_call": true,
  "temperature": false,
  "modalities": {
    "input": [
      "text",
      "image",
      "pdf"
    ],
    "output": [
      "text"
    ]
  },
  "limit": {
    "context": 1000000,
    "output": 128000
  },
  "benchmarks": [
    {
      "name": "FrontierCode",
      "score": 49.1,
      "source": "https://www.anthropic.com/claude-fable-and-mythos-5-2",
      "metric": "score",
      "variant": "xhigh effort; safeguards on",
      "version": "2.0",
      "date": "2026-11-09"
    },
    {
      "name": "FrontierSWE",
      "score": 69.9,
      "source": "https://www.anthropic.com/claude-fable-and-mythos-5-2",
      "metric": "score",
      "variant": "highest available effort; safeguards on",
      "version": "2",
      "date": "2026-11-09"
    },
    {
      "name": "AutomationBench",
      "score": 51.4,
      "source": "https://www.anthropic.com/claude-fable-and-mythos-5-2",
      "metric": "score",
      "variant": "highest available effort; safeguards on",
      "date": "2026-11-09"
    },
    {
      "name": "Terminal-Bench-Science",
      "score": 74.6,
      "source": "https://www.anthropic.com/claude-fable-and-mythos-5-2",
      "metric": "score",
      "variant": "highest available effort; safeguards on",
      "version": "0.1",
      "date": "2026-11-09"
    },
    {
      "name": "WANDR",
      "score": 82.1,
      "source": "https://www.anthropic.com/claude-fable-and-mythos-5-2",
      "metric": "relaxed score",
      "variant": "highest available effort; safeguards on",
      "date": "2026-11-09"
    },
    {
      "name": "OSWorld",
      "score": 89.3,
      "source": "https://www.anthropic.com/claude-fable-and-mythos-5-2",
      "metric": "partial score",
      "variant": "highest available effort; safeguards on",
      "dataset": "offline set",
      "version": "2.1",
      "date": "2026-11-09"
    },
    {
      "name": "RoboDojo Sim",
      "score": 64.9,
      "source": "https://www.anthropic.com/claude-fable-and-mythos-5-2",
      "metric": "average success rate",
      "variant": "max effort; internal run",
      "date": "2026-11-09"
    },
    {
      "name": "AA-Briefcase",
      "score": 66.1,
      "source": "https://www.anthropic.com/claude-fable-and-mythos-5-2",
      "metric": "rubric score",
      "variant": "highest available effort; safeguards on",
      "version": "1.1",
      "date": "2026-11-09"
    },
    {
      "name": "AA-Briefcase",
      "score": 1785,
      "source": "https://www.anthropic.com/claude-fable-and-mythos-5-2",
      "metric": "Elo",
      "variant": "highest available effort; safeguards on",
      "version": "1.1",
      "date": "2026-11-09"
    },
    {
      "name": "Remote Labor Index",
      "score": 41.3,
      "source": "https://www.anthropic.com/claude-fable-and-mythos-5-2",
      "metric": "score",
      "variant": "high effort; safeguards on",
      "date": "2026-11-09"
    },
    {
      "name": "Humanity's Last Exam",
      "score": 74.2,
      "source": "https://www.anthropic.com/claude-fable-and-mythos-5-2",
      "metric": "score",
      "variant": "with tools; highest available effort; safeguards on",
      "date": "2026-11-09"
    },
    {
      "name": "Chartography",
      "score": 73.4,
      "source": "https://www.anthropic.com/claude-fable-and-mythos-5-2",
      "metric": "score",
      "variant": "no tools; highest available effort; safeguards on",
      "date": "2026-11-09"
    }
  ],
  "release_date": "2026-11-09",
  "open_weights": false
}

Text provenance

Watermarked · Global

Claude text watermarking

Anthropic says newer Claude models include an invisible statistical watermark globally. It changes token selection rather than adding hidden characters.

Official explanation

Frequently asked questions

API and pricing

Generated from Vertical Tabs data, updated November 11, 2026.

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