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About

Claude Fable 5.5 is not currently an announced or released Anthropic model as of September 30, 2026. Anthropic's current model documentation lists Claude Fable 5.1 as the latest Fable model alongside Claude Opus 5.5 and Claude Sonnet 5.5. Fable 5.1 remains Anthropic's premium model for demanding reasoning and long-horizon agentic workloads, with a 1-million-token context window and maximum output of 128,000 tokens. It uses adaptive thinking that is always enabled and defaults to a high reasoning effort level. Fable 5.1 is priced at $10 per million input tokens and $50 per million output tokens, with cache reads priced at $0.25 per million tokens. Anthropic has released Opus 5.5 and Sonnet 5.5, but there is currently no official model documentation, pricing, release date, benchmark data, or API identifier for Claude Fable 5.5.

About

Trinity Large Thinking is a frontier open source reasoning model developed by Arcee AI, designed specifically for complex, multi-step problem solving and autonomous agent workflows that require long-horizon planning and tool use. Built on a sparse Mixture-of-Experts architecture with roughly 400 billion total parameters but only about 13 billion active per token, the model achieves high efficiency while maintaining strong reasoning performance across tasks such as mathematical problem solving, code generation, and multi-step analysis. It introduces extended chain-of-thought reasoning capabilities, allowing the model to generate intermediate “thinking traces” before producing final answers, which improves accuracy and reliability in complex scenarios. Trinity Large Thinking supports a very large context window of up to 262K tokens, enabling it to process long documents, maintain state across extended interactions, and operate effectively in continuous agent loops.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Developers, AI researchers, enterprises, software engineering teams, and advanced professional users handling demanding reasoning and long-horizon agentic workloads, although Anthropic has not yet announced the model or specified its intended audience

Audience

Developers and enterprises building autonomous AI agents that need a high-performance, open-source reasoning model for complex, multi-step workflows

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Supported

API

Offers API Supported

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported

Pricing

Free
Free Version Supported
Free Trial Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Anthropic
Founded: 2021
United States
claude.ai

Company Information

Arcee AI
Founded: 2023
United States
www.arcee.ai/blog/trinity-large-thinking

Alternatives

Mistral Large 4

Mistral Large 4

Mistral AI

Alternatives

Kimi K2 Thinking

Kimi K2 Thinking

Moonshot AI
Claude Fable 5

Claude Fable 5

Anthropic
GLM-5.1

GLM-5.1

Z.ai
Claude Opus 5

Claude Opus 5

Anthropic
LongCat-2.0

LongCat-2.0

LongCat

Categories

AI Coding Models Supported
AI Models Supported
AI Vision Models Supported
Foundation Models Supported
Multimodal Models Supported

Categories

AI Models Supported

Integrations

OpenClaw Supported
Vercel AI Gateway Supported
Visual Studio Code Supported
Charlie Supported
Cheaper Inference Supported
Claude Design Supported
Claude Max Supported
Claude Mythos 5.1 Not Supported
Claude Opus 4.7 Not Supported
Claude Science Supported
GitHub Supported
Google Antigravity Supported
Mimasa AI Supported
OfoxAI Supported
Perplexity Computer Supported
Rust Supported
Springhub Supported
Trinity-Large-Thinking Supported
Viktor Supported
Xcode Supported

Integrations

OpenClaw Supported
Vercel AI Gateway Supported
Visual Studio Code Supported
Charlie Not Supported
Cheaper Inference Not Supported
Claude Design Not Supported
Claude Max Not Supported
Claude Mythos 5.1 Supported
Claude Opus 4.7 Supported
Claude Science Not Supported
GitHub Not Supported
Google Antigravity Not Supported
Mimasa AI Not Supported
OfoxAI Not Supported
Perplexity Computer Not Supported
Rust Not Supported
Springhub Not Supported
Trinity-Large-Thinking Not Supported
Viktor Not Supported
Xcode Not Supported
Claim Claude Fable 5.5 and update features and information
Claim Claude Fable 5.5 and update features and information
Claim Trinity-Large-Thinking and update features and information
Claim Trinity-Large-Thinking and update features and information