AI Model Release Tracker

Claude Fable 5.2

Released

Claude Fable 5.2 is an AI model released by Anthropic on Monday, Nov 9 2026, 33 days after Claude Haiku 5.5. It has a 1M token context windowHow much information the model can work with in one request, measured in tokens — pieces of words or other data. This includes your question, attachments, conversation and reply. Limits can vary by model variant and provider.. Benchmark results (shown below) cover FrontierSWE V2, FrontierCode 2.0, RoboDojo Sim, WANDR (relaxed score), Humanity's Last Exam, OSWorld 2.1, and 6 more.

API pricing

InputWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it.
$8.00
Cached inputA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again.
$0.20
5 min cache writeA one-off charge for storing text so later requests can reuse it at the cheaper cached rate. This option keeps it for five minutes.
$10.00
1 hr cache writeA one-off charge for storing text so later requests can reuse it at the cheaper cached rate. This option keeps it for an hour, so it costs more than the five-minute one.
$16.00
OutputWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one.
$40.00
  • Adaptive thinking is always on.
  • Cache reads are priced at 0.025x base input on Claude Fable 5.2 and Mythos 5.2, the same multiplier as Fable 5.1.
  • Fast mode costs $16 per million input tokens and $80 per million output tokens and speeds up generation by up to 2.5 times. Availability depends on platform; see the current first-party pricing documentation.
USD per 1M tokensEvery price here is for one million tokens. A token is roughly three-quarters of a word, so a million tokens is about 750,000 words of text.Verified October 19, 2026Read from platform.claude.com. Click the check to open the source.

Benchmarks

Coding

FrontierSWE V2Ultra-long-horizon coding — Engineering problems that would occupy a person for days: systems implementation, performance work, scientific computing and AI research, with up to twenty hours per task. Partial credit is awarded, because finishing one outright is still rare. Higher is better.
69.9%
#1
FrontierCode 2.0Agentic coding — whether a model’s code changes to open-source repositories would be merged by their maintainers (version 2.0); separate from FrontierCode v1.1 scores
49.1%
#1

Terminal & CLI

Terminal-Bench-Science 0.1Agentic scientific computing — The same command-line setup as Terminal-Bench, pointed at scientific work: the AI has to drive research tooling and computational workflows through to a result, rather than administer a machine. Version 0.1 is the first release of the task set, and scores run lower than on the general board. Higher is better.
74.6%
#2 of 15

Agentic & tool use

RoboDojo SimRobotics — control of a simulated two-arm robot from camera images, average success rate
64.9%
#1
WANDR (relaxed score)Agentic search — agentic web search, relaxed scoring
82.1%
#1
OSWorld 2.1Agentic computer use — Can the AI actually operate a computer — clicking, typing, and using real apps — to finish tasks on its own? Version 2.1, in its offline setting. Scores are not comparable with version 2.0. Higher is better.
89.3%offline
#1
AutomationBenchBusiness workflows — Tests whether the AI can run real multi-step business workflows — the kind of end-to-end office processes companies want to automate — from start to finish. Higher is better.
51.4%
#5 of 32

Reasoning & science

Humanity's Last ExamMultidisciplinary reasoning — Humanity's Last Exam — extremely hard expert questions across many subjects. “With tools” means the AI is allowed to search the web or run code while answering. Higher is better.
74.2%with tools
#1

Knowledge work

AA-Briefcase v1.1 (rubric)Knowledge work — Artificial Analysis agentic office-work eval, v1.1 rubric score; separate from the Elo rating
66.1%
#1
Remote Labor Index (RLI)Knowledge work — real paid remote-work projects, scored on the share completed to client standard
41.3%
#1
AA-Briefcase v1.1Knowledge work — Artificial Analysis agentic office-work eval (Elo, v1.1 rating fit)
1785
#3 of 13

Multimodal

ChartographyChart tasks — The same chart-centred test with no tools: the AI has to read each chart unaided. Scores run far lower than the with-tools version, so read the two as separate tests. Higher is better.
73.4%no tools
#1

Compare Claude Fable 5.2 with

Claude Fable 5.2

Suggested comparisons

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About

Claude Fable 5.2 was released on November 9, 2026 as the next model in Anthropic's Fable line, positioned for demanding reasoning and long-horizon agentic work. It shared its underlying model with Claude Mythos 5.2 and kept cybersecurity and biology safeguards so that it could be offered to all users. Anthropic cut the price to $8 per million input tokens and $40 per million output tokens, from $10 and $50 on Fable 5.1, and reported output up to 30% faster.

At launch it scored 49.1% on FrontierCode 2.0 at Xhigh effort, which Anthropic described as the highest result of any released model it had tested, along with 74.2% on Humanity's Last Exam with tools and 64.9% on the internally run RoboDojo Sim, more than double Fable 5.1's 27.6%. Anthropic still recommended Opus 5.5 as the starting point for most coding and knowledge work and reserved Fable for the most ambitious open-ended technical tasks. In early testing its safeguards blocked about 55% fewer requests than Fable 5.1's; blocked queries fell back to Opus 4.8 for cybersecurity and Opus 5 for biology.

Frequently asked questions

Claude Fable 5.2 was released by Anthropic on Monday, Nov 9 2026.

All Anthropic releases

33 tracked