# Claude Fable 5

> Anthropic's first publicly released Mythos-class model — 1M context, vision, $10/$50 per MTok.

- Maker: Anthropic
- Line: Claude Fable / Mythos (Mythos-class)
- Canonical page: https://ai-tldr.dev/models/claude-fable-5/
- Updated: 2026-07-05

## In short

Claude Fable 5 is Anthropic's most capable widely released model and the first member of its Mythos class — a capability tier above the Opus line — that the company made generally available. Anthropic released it on 9 June 2026 as an API-only model. It has a 1M-token context window and costs $10.00 per million input tokens and $50.00 per million output tokens.

## Facts

| Fact | Value | Source |
| --- | --- | --- |
| Context window | 1M (max output 128K) | [1] |
| Input price | $10.00 / 1M tokens (cached $1.00) | [2] |
| Output price | $50.00 / 1M tokens | [2] |
| Licence | Proprietary · API only | [1] |
| Released | 9 June 2026 | [3] |
| Parameters | Undisclosed | [1] |

## Sources

1. [Models overview (specs)](https://platform.claude.com/docs/en/about-claude/models/overview)
2. [Anthropic pricing](https://platform.claude.com/docs/en/about-claude/pricing)
3. [Claude Fable 5 and Claude Mythos 5 (announcement)](https://www.anthropic.com/news/claude-fable-5-mythos-5)

## Overview

Claude Fable 5 is Anthropic's most capable widely released model and the first member of its Mythos class — a capability tier above the Opus line — that the company made generally available. It launched on June 9, 2026 (API id claude-fable-5) on the Claude API, Claude Platform on AWS, Amazon Bedrock, Vertex AI, and Microsoft Foundry, built for the most demanding reasoning and long-horizon agentic work.

Claude Fable 5 shares the same underlying model as the restricted Claude Mythos 5, but ships with safety classifiers that can decline requests in high-risk areas (cybersecurity, biology and chemistry, and model-distillation attempts); refused requests instead route to Claude Opus 4.8. Anthropic reports that more than 95% of Fable 5 sessions involve no fallback at all. It carries a 1M-token context window and up to 128K output tokens, accepts text and image input, and runs adaptive thinking that is always on (extended thinking is not offered; the effort parameter controls thinking depth).

Three days after launch, on June 12, 2026, Anthropic suspended all access to Claude Fable 5 and Claude Mythos 5 to comply with a US government export-control directive — reportedly the first time the United States applied export controls to an AI model itself rather than the chips behind it. Anthropic publicly disagreed with the decision, which it tied to a narrow potential jailbreak, but disabled the models for all customers to remain compliant while working to restore access.

On June 30, 2026 the export controls were lifted and Anthropic announced Claude Fable 5 would be redeployed globally on July 1, 2026 on the Claude Platform, Claude.ai, Claude Code, and Claude Cowork, with AWS, Google Cloud, and Microsoft Foundry access being re-enabled as quickly as possible. The redeployment ships with an improved safety classifier that blocks the specific jailbreak technique flagged by Amazon researchers in over 99% of cases; for Pro, Max, Team and select Enterprise plans, Fable 5 is included for up to 50% of weekly usage limits through July 7, and available via usage credits after.

## Benchmarks

- SWE-bench Verified: 95% ([source](https://www.digitalapplied.com/blog/claude-fable-5-mythos-5-release-benchmarks-2026))
- SWE-bench Pro: 80.3% ([source](https://www.digitalapplied.com/blog/claude-fable-5-mythos-5-release-benchmarks-2026))
- OSWorld-Verified (computer use): 85% ([source](https://www.digitalapplied.com/blog/claude-fable-5-mythos-5-release-benchmarks-2026))
- Terminal-Bench 2.1: 88% ([source](https://www.digitalapplied.com/blog/claude-fable-5-mythos-5-release-benchmarks-2026))

## Pricing

- Input: $10.00 / 1M tokens
- Cached input: $1.00 / 1M tokens
- Output: $50.00 / 1M tokens

5-minute cache write $12.50/MTok; 1-hour cache write $20/MTok; Batch API $5 input / $25 output per MTok. Same pricing for Mythos 5.

Source: https://platform.claude.com/docs/en/about-claude/pricing

## Strengths

- Frontier-level agentic coding — 95% on SWE-bench Verified and 80.3% on SWE-bench Pro, ahead of Claude Opus 4.8
- Strong computer use and terminal agents (85% OSWorld-Verified, 88% Terminal-Bench 2.1)
- 1M-token context window billed at standard per-token rates, with up to 128K output tokens
- Vision input strong enough to rebuild a web app's source from screenshots and read precise numbers from scientific figures
- Adaptive thinking always on, with an effort parameter to tune reasoning depth against cost

## Best for

- Reach for it for the most demanding multi-step agentic coding across large codebases when you want above-Opus capability.
- Use it for long-horizon agent workflows (computer use, terminal automation) where reliability matters more than per-token cost.
- Apply it to deep reasoning and analysis over very long documents that fit a 1M-token context.
- Use it for vision-heavy work like reconstructing UIs from screenshots or extracting figures from scientific PDFs.

## How to access

- [Anthropic API](https://platform.claude.com/docs/en/about-claude/models/overview) — model id `claude-fable-5`
- [Amazon Bedrock](https://platform.claude.com/docs/en/about-claude/models/overview) — model id `anthropic.claude-fable-5`
- [Google Cloud Vertex AI](https://platform.claude.com/docs/en/about-claude/models/overview) — model id `claude-fable-5`

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

- Claude Fable 5 (9 June 2026) — this page
- [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

### What is Claude Fable 5?

Claude Fable 5 is Anthropic's most capable widely released model and the first publicly available model in its Mythos class, a capability tier above the Opus line. It launched on June 9, 2026 with the API id claude-fable-5. It is the same underlying model as the restricted Claude Mythos 5, but adds safety classifiers that route sensitive requests to Claude Opus 4.8.

### How much does Claude Fable 5 cost?

Claude Fable 5 costs $10 per million input tokens and $50 per million output tokens on the Anthropic API. Cache reads are $1 per million tokens, a 5-minute cache write is $12.50, and the Batch API halves prices to $5 input / $25 output per million tokens. Claude Mythos 5 carries the same pricing.

### What are the context window and output limits of Claude Fable 5?

Claude Fable 5 has a 1M-token context window at standard pricing and can generate up to 128K output tokens per request. It accepts text and image input, and adaptive thinking is always on; the effort parameter controls thinking depth.

### Why was Claude Fable 5 suspended?

On June 12, 2026, three days after launch, Anthropic suspended all access to Claude Fable 5 and Claude Mythos 5 to comply with a US government export-control directive — reportedly the first export control applied to an AI model rather than to chips. Anthropic publicly disagreed with the order, which it linked to a narrow potential jailbreak, but disabled the models for all customers while working to restore access.

### Is Claude Fable 5 available again?

Yes. Anthropic announced on June 30, 2026 that the US export controls had been lifted, and Claude Fable 5 was redeployed globally on July 1, 2026 across the Claude Platform, Claude.ai, Claude Code, and Claude Cowork, with AWS, Google Cloud, and Microsoft Foundry access being re-enabled soon after. The redeployment ships with an improved safety classifier that Anthropic reports blocks the specific jailbreak technique from the Amazon research report in over 99% of cases. For Pro, Max, Team and select Enterprise plans, Fable 5 is included for up to 50% of weekly usage limits through July 7, and available via usage credits after.

## Links

- [Claude Fable 5 and Claude Mythos 5 (announcement)](https://www.anthropic.com/news/claude-fable-5-mythos-5)
- [Introducing Claude Fable 5 and Claude Mythos 5 (API docs)](https://platform.claude.com/docs/en/about-claude/models/introducing-claude-fable-5-and-claude-mythos-5)
- [Models overview (specs)](https://platform.claude.com/docs/en/about-claude/models/overview)
- [Anthropic pricing](https://platform.claude.com/docs/en/about-claude/pricing)
- [Statement on the US export-control directive to suspend Fable 5 and Mythos 5](https://www.anthropic.com/news/fable-mythos-access)
- [Redeploying Claude Fable 5 (Anthropic, June 30, 2026)](https://www.anthropic.com/news/redeploying-fable-5)
- [Claude Fable 5 & Mythos 5 release benchmarks](https://www.digitalapplied.com/blog/claude-fable-5-mythos-5-release-benchmarks-2026)
- [Claude Fable 5 benchmarks, pricing & context window (llm-stats)](https://llm-stats.com/models/claude-fable-5)

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