Anthropic
Claude Haiku 5.5
claude-haiku-5.5
Total Context
1M
Max Output
128K
Released
N/A
Input$0.1 / M tokens
Output$0.5 / M tokens
Claude Fable 5.2
claude-fable-5.2Claude Fable 5.2 is Anthropic's most capable model for the most demanding technical work, with gains over Fable 5.1 in coding, reasoning, and vision. In prerelease testing it completed otherwise-infeasible software migrations, designed working electronic devices from scratch, and made progress on open problems in physics and mathematics. It communicates more clearly than earlier Fable models and generates output up to 30% faster than Fable 5.1. Adaptive extended thinking is always on, with reasoning effort levels from low to max (default high) and preserved thinking across turns. Anthropic recommends Opus 5.5 as the daily driver for most coding and knowledge work, with Fable 5.2 for the most ambitious, open-ended problems.
Context Window
1M tokens
Maximum Output
128K tokens
Release Date
Nov 9, 2026
Modalities
Claude Fable 5.2 Pricing
| Input Price | Output Price | Cache Read | Cache Create 5m |
|---|---|---|---|
| $8/M | $40/M | $0.2/M | $10/M |
Claude Fable 5.2 API Capabilities
Reasoning
Supported
Tool calling
Supported
Temperature parameter
Not supported
Attachments
Supported
Knowledge Base
2026-06-01
Endpoint Protocols
Messages API
Claude Fable 5.2 Model Highlights
Strengths for demanding engineering, reasoning and visual analysis.
Engineering Judgment
Anthropic reports strong coding judgment and high-quality results even from ambiguous engineering requests.
Technical Reasoning
Designed for ambitious, open-ended technical work, with improved reasoning and research capabilities over Fable 5.1.
Visual Understanding
Improved vision and chart recognition help connect visual evidence with technical analysis.
Improved Efficiency
Anthropic reports up to 30% faster output than Fable 5.1 and fewer tokens for challenging tasks at Medium effort.
Claude Fable 5.2 Use Cases
Practical workloads supported by the official release examples.
Software Migrations
Plan and implement complex service migrations, investigate stubborn bugs and optimize performance, with code review and testing.
Multiagent Projects
Use an agent framework to coordinate implementation, testing and review across large projects, or consult the model on difficult subtasks.
Scientific Workflows
Develop analysis code, explore mathematical problems and support proof formalization, with independent validation of results.
Hardware Prototypes
Assist with component selection, circuit-board layout, CAD enclosures and firmware; qualified engineers manufacture and validate the prototype.
How to Use Claude Fable 5.2 via the TokenHub API
curl 'https://us-api.tokenhub.com/v1/messages' \
-X 'POST' \
-H "Authorization: Bearer $TOKENHUB_API_KEY"Claude Fable 5.2 FAQs
Answers about capabilities, limitations, model selection and TokenHub usage.
What Is Claude Fable 5.2?+
It is Anthropic’s model for ambitious, open-ended technical work. It shares its underlying model with Claude Mythos 5.2 and adds cybersecurity and biology safeguards.
Which Workloads Suit Claude Fable 5.2?+
Official examples include complex software migrations, difficult debugging, coordinated agent projects, mathematical formalization and hardware prototyping.
What Improves Over Claude Fable 5.1?+
Anthropic reports improvements in coding, reasoning and vision, clearer communication, and output up to 30% faster. Gains depend on the task and configuration.
What Limitations Should I Consider?+
Cybersecurity and biology safeguards can block requests. Independently verify important code, calculations and device designs before using the results.
How Do I Use Claude Fable 5.2 Through TokenHub?+
If available to your account, select Claude Fable 5.2 and use the model ID, endpoint and API key shown in TokenHub’s console. Check the selected route’s supported request fields.
How Is Claude Fable 5.2 Priced?+
Anthropic lists standard pricing at US$8 per million input tokens and US$40 per million output tokens. Fast mode costs more. TokenHub billing follows its current route pricing.
When Should I Choose Claude Fable 5.2 Over Opus?+
Anthropic recommends starting with Opus 5.5 for everyday coding and knowledge work. Evaluate Claude Fable 5.2 for harder, open-ended tasks against your quality, latency and cost targets.
Ready to use Claude Fable 5.2?
Use one API key to access Claude Fable 5.2 and more AI models through TokenHub.
Claude Fable 5.2 Media and Demos
Verified official posts, videos and community discussions about Claude Fable 5.2; community opinions are not official performance guarantees.
X (Twitter)
Official Model Announcement
Claude ·
Claude introduces Claude Fable 5.2 and Claude Mythos 5.2, highlighting improvements in coding, reasoning and vision.
Introducing Claude Fable 5.2 and Claude Mythos 5.2, designed to tackle the most daunting technical challenges. They’re capable collaborators on ambitious projects in many fields, and show improvements in areas like coding, reasoning, and vision. https://t.co/jP0AutLxXb
https://pbs.twimg.com/media/HWtIJNLWUAAcc7I.jpgView originalPerformance And Speed Update
Claude ·
The official release thread reports clearer communication and faster output than the Fable 5.1 and Mythos 5.1 models.
Fable 5.2 and Mythos 5.2 are a step above Opus 5.5 in almost all the capabilities we evaluated. Testers have found that they communicate more clearly than past Fable and Mythos models. They generate outputs up to 30% faster than Fable 5.1 and Mythos 5.1. https://t.co/nqXVdmLRpN
https://pbs.twimg.com/media/HWtD8jqXwAAZsiB.pngView originalElectronic Device Demo
Claude ·
An official demonstration of the voice-assistant hub designed with Claude Fable 5.2 as part of a three-device project.
During pre-release testing, Claude Fable 5.2 and Claude Mythos 5.2 worked on ambitious projects in many different fields. Here are a few. From a one-paragraph prompt, Fable 5.2 designed three working electronic devices, including this home voice assistant hub. https://t.co/efOYdhRr7K
https://pbs.twimg.com/amplify_video_thumb/2119889970664030208/img/zA7dOkx94Gdcx8Se.jpgView originalReddit
Community Launch Discussion
Introducing Claude Fable 5.2 and Claude Mythos 5.2
GloriousLebron ·
A community thread links the official Claude Fable 5.2 and Claude Mythos 5.2 announcement and discusses the release.
View originalCommunity Usage Review
Fable 5.2 REVIEW Here is what's actually different and what to try first (cheaper, faster, way fewer blocks)
FragrantProgress8376 ·
An early user shares impressions of speed, effort settings, visual debugging and usage limits; these are personal observations.
Read full post
I got early accees so and ran the same things I run on every new model. Skipping the benchmarks. This is what I noticed and what's worth your time. What's different Speed. First thing I noticed. Anthropic say output is up to 30% faster than 5.1 and that matches how it felt. There's also a fast mode in Claude Code and the API that goes up to 2.5x. Check what it costs before you leave it on. Usage. I stayed on medium effort all evening and never felt I needed high. Anthropic say it uses fewer tokens than 5.1 on hard tasks at medium, so start there. Blocks. Around 55% fewer than 5.1. I don't do bio or security work so I can't test this one. If you kept getting bumped to Opus, rerun the exact prompt that got blocked and tell us. Price. API is $8 in / $40 out per million tokens, down from $10 / $50. Model string is claude-fable-5-2. Free resets. Paid plans that include Fable get one to three usage resets this week, depending on how long you've subscribed. Check your usage page and save your biggest job for this week. Vision. Listed as one of the main upgrades, next to coding and reasoning. I gave it a screenshot of a page that looked wrong and asked what was broken. It worked the problem out from the image alone. Fable 5.2 is out. Here's what's actually different and what to try first (cheaper, faster, way fewer blocks) Got on it as soon as it showed up in the model picker and ran the same things I run on every new model. Skipping the benchmarks. This is what I noticed and what's worth your time. What's the same Same model as Mythos with the cyber and bio safeguards on top. Mythos is only for verified security and life sciences orgs. Still won't know what changed on a webpage last week unless you tell it to search. Still eats limits faster than Opus or Sonnet. Use it for the hard thing and the cheaper models for the rest. What to try first Get it to review whatever your last model built. I pointed it at a project my last model built and asked for bugs first, opinions second. It came back with things the old one had walked straight past. Still the best first test for any new model. Give it a screenshot of a broken UI or a photo of a whiteboard and ask what's wrong. Hand it a half-formed request and ask what it would do and why before it does it. I did this on purpose. The plan made sense, which is more than I can say for my request. Rerun the one task 5.1 kept getting wrong, same prompt, so you can compare fairly. May be dont try yet : A giant refactor on day one. High effort for everything. Using it as a search engine. If you find something it does that 5.1 couldn't, post it below. Right, back to it.
Unreal Engine Game Demo
Claude Fable 5.2 built a playable Gears of War clone in Unreal Engine from a 3-line prompt, complete with enemy AI, cover mechanics and active reloading. After testing it with over 100 billion tokens, Matthew Berman calls it “by far the best model” he’s ever used.
141_1337 ·
A community post shares an Unreal Engine game demo attributed to Claude Fable 5.2 and discusses the limits of AI-assisted game development.
View originalYouTube
Official Introduction
Introducing Claude Fable 5.2
Claude
Claude’s official launch video introduces Claude Fable 5.2 for demanding technical challenges.
View originalVoice-Assistant Hub Prototype
Claude Fable 5.2 designs a working voice-assistant hub
Claude
The official demo describes circuit-board layout, CAD enclosure design and firmware generated with Claude Fable 5.2, then manufactured by Diode Computers.
View originalMatt Wolfe’s Release Overview
Anthropic's Fable 5.2 is the World’s Best AI Model
Matt Wolfe
Matt Wolfe discusses the release, benchmarks, pricing and demonstrations of Claude Fable 5.2 from a reviewer’s perspective.
View original