---
license: apache-2.0
task_categories:
- text-generation
- question-answering
language:
- en
pretty_name: The First And Best Fable 5.1 Reasoning Data
tags:
- fable 5.1
- coding
- synthetic
- thinking
- think
- reason
- reasoning
- distill
- distillation
- agent
- agentic
- SFT
- CoT
- code
- programming
- thought
- thoughts
- SWE
- tool-use
- mythos 5.1
- mythos
- fable class
- mythos class
- fable 5
- mythos 5
size_categories:
- 1K<n<10K
configs:
- config_name: default
  data_files:
  - split: lite
    path: 5k/train.jsonl
  - split: full
    path: 10k/train.jsonl
---
## Dataset Description

This dataset contains 10,000 agentic coding and reasoning multi-turn high-quality traces generated by the new Fable 5.1 model using max reasoning effort.

It holds almost 500,000,000 tokens of step-by-step chain-of-thought programming across multiple complex domains. 

It has also been deduplicated and **heavily** filtered to remove low-quality traces, keeping only high-quality traces.

## Dataset Statistics

| Metric | Value |
| :--- | :--- |
| **Total Examples** | 10,000 Traces |
| **Total Token Count** | ~500,000,000 Tokens |
| **Total Dataset Size** | 1.97 GB |
| **Average Trace Size** | 197 KB |
| **Average Token Count** | ~50,000 Tokens |

## Dataset Contents & Coverage

The dataset includes step-by-step problem-solving for complex coding tasks, including:

- Algorithm design, implementation, and performance optimization.
  
- Advanced debugging and error-handling.

- Multi-step logic design and compliance with complex prompt constraints.

## Uses

- Distilling Fable 5.1 agentic coding and reasoning capabilities down to smaller LLMs.
  
- Improve general coding and reasoning quality.
  
- Teaching models to generate clear chain-of-thought steps and tool-use before outputting their final answer.