# Claude Fable 5.2

> Anthropic's top Claude model (November 2026): 1M context, $8/$40 per MTok, up to 30% faster than Fable 5.1.

- Maker: Anthropic
- Line: Claude Fable / Mythos (Mythos-class)
- Canonical page: https://ai-tldr.dev/models/claude-fable-5-2/
- Updated: 2026-11-09

## In short

Claude Fable 5.2 is Anthropic's Mythos-class model released on 9 November 2026, built for the most demanding technical and open-ended work. It has a 1M-token context window and costs $8.00 per million input tokens and $40.00 per million output tokens. You can use it through Claude API.

## Facts

| Fact | Value | Source |
| --- | --- | --- |
| Context window | 1M (max output 128K) | [1] |
| Input price | $8.00 / 1M tokens | [2] |
| Output price | $40.00 / 1M tokens | [2] |
| Licence | Proprietary · API only | [1] |
| Released | 9 November 2026 | [1] |
| Parameters | Undisclosed | [1] |
| Knowledge cutoff | June 2026 | [1] |

## Sources

1. [Models overview](https://platform.claude.com/docs/en/models/overview)
2. [Introducing Claude Fable 5.2 and Claude Mythos 5.2](https://www.anthropic.com/claude-fable-and-mythos-5-2)

## Overview

Claude Fable 5.2 is Anthropic's Mythos-class model released on 9 November 2026, built for the most demanding technical and open-ended work. It is the generally available half of the release: Claude Mythos 5.2 is the same underlying model with lighter cybersecurity and biology safeguards, offered only to vetted organizations through Anthropic's Cyber Verification Program and Life Sciences Verification Program. It reads text and images, has a 1M-token context window and up to 128K output tokens, with adaptive thinking always on (default effort high) and a June 2026 knowledge cutoff. The API model ID is claude-fable-5-2, and it is available on Amazon Web Services, Google Cloud and Microsoft Azure.

Standard pricing is $8 per million input tokens and $40 per million output tokens. An optional fast mode costs $16 and $80 per million tokens and speeds up token generation by up to 2.5 times. Anthropic says outputs are up to 30% faster than Fable 5.1 and Mythos 5.1. Fable 5.2 can also act as an Advisor or an Orchestrator for other Claude models.

Anthropic reports 69.9% on FrontierSWE v2 against 56.3% for Fable 5.1 and 62.3% for Claude Opus 5.5, and 41.3% on the Remote Labor Index against 17.9% for Fable 5.1. Its cyber and biology classifiers block about 55% fewer queries than Fable 5.1's. Anthropic recommends starting most coding and knowledge tasks on Claude Opus 5.5 and moving up to Fable or Mythos only when needed.

## Benchmarks

- FrontierSWE v2 (agentic coding): 69.9% ([source](https://www.anthropic.com/claude-fable-and-mythos-5-2))
- Remote Labor Index (knowledge work): 41.3% ([source](https://www.anthropic.com/claude-fable-and-mythos-5-2))
- Humanity's Last Exam (with tools): 74.2% ([source](https://www.anthropic.com/claude-fable-and-mythos-5-2))
- AutomationBench (business workflows): 51.4% ([source](https://www.anthropic.com/claude-fable-and-mythos-5-2))

## Pricing

- Input: $8.00 / 1M tokens
- Output: $40.00 / 1M tokens

Optional fast mode $16/$80 per MTok, up to 2.5x faster generation. Claude Mythos 5.2 is available to verified organizations.

Source: https://www.anthropic.com/claude-fable-and-mythos-5-2

## Strengths

- Agentic coding — 69.9% on FrontierSWE v2 and 49.1% on FrontierCode 2.0 at Xhigh effort
- Knowledge work — 41.3% on the Remote Labor Index and 51.4% on AutomationBench
- Standard price 20% below Fable 5.1's published $10/$50 per MTok
- Output up to 30% faster than Fable 5.1, with an optional fast mode up to 2.5x faster
- Cyber and biology classifiers block about 55% fewer queries than on Fable 5.1

## Best for

- Run long-horizon agentic coding where Claude Opus 5.5 still falls short on your own evals.
- Use Fable 5.2 as an Advisor or Orchestrator that steers cheaper Claude models in multi-agent setups.
- Automate business workflows and remote knowledge work end to end.

## How to access

- [Claude API](https://platform.claude.com/docs/en/models/overview) — model id `claude-fable-5-2`

## Claude Fable / Mythos (Mythos-class) versions

- Claude Fable 5.2 (9 November 2026) — this page
- [Claude Fable 5.1](https://ai-tldr.dev/models/claude-fable-5-1/) (1 September 2026)
- [Claude Mythos 5.1](https://ai-tldr.dev/models/claude-mythos-5-1/) (1 September 2026)
- [Claude Fable 5](https://ai-tldr.dev/models/claude-fable-5/) (9 June 2026)
- [Claude Mythos 5](https://ai-tldr.dev/models/claude-mythos-5/) (9 June 2026)
- [Claude Mythos Preview](https://ai-tldr.dev/models/claude-mythos-preview/) (April 2026)

## FAQ

### How much does Claude Fable 5.2 cost?

Claude Fable 5.2 costs $8 per million input tokens and $40 per million output tokens, below the $10 and $50 Anthropic published for Claude Fable 5.1. An optional fast mode costs $16 and $80 per million tokens and speeds up token generation by up to 2.5 times.

### How is Claude Mythos 5.2 different from Claude Fable 5.2?

Claude Mythos 5.2 is the same underlying model as Claude Fable 5.2 with lighter cybersecurity and biology safeguards. Anthropic offers it only to vetted organizations through its Cyber Verification Program and Life Sciences Verification Program, while Claude Fable 5.2 is available to all users.

### Which clouds offer Claude Fable 5.2?

Anthropic says Claude Fable 5.2 is available on all platforms, including Amazon Web Services, Google Cloud and Microsoft Azure, with the API model ID claude-fable-5-2. Fast mode is limited to Claude Code, the Claude Platform, Claude Models on Google Cloud and Microsoft Foundry.

### What is the context window of Claude Fable 5.2?

Claude Fable 5.2 has a 1M-token context window and can output up to 128K tokens. It accepts text and image input, uses adaptive thinking that is always on (default effort high), and has a reliable knowledge cutoff of June 2026. Anthropic will not retire it before November 9, 2027.

## Links

- [Introducing Claude Fable 5.2 and Claude Mythos 5.2](https://www.anthropic.com/claude-fable-and-mythos-5-2)
- [Claude Fable 5.2 and Mythos 5.2 system card](https://www.anthropic.com/document/claude-fable-5-2-mythos-5-2-system-card)
- [Models overview](https://platform.claude.com/docs/en/models/overview)

Source: AI/TLDR LLM registry, https://ai-tldr.dev/models/claude-fable-5-2/