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---

license: mit
pretty_name: Complete FABLE.5 Traces 2M
annotations_creators:
- machine-generated
language:
- en
language_creators:
- found
- machine-generated
multilinguality:
- monolingual
size_categories:
- 1M<n<10M
task_categories:
- text-generation
task_ids:
- language-modeling
tags:
- agent-traces
- traces
- claude-code
- fable-5
- mythos
- chain-of-thought
- tool-use
- coding-agents
- synthetic-data
- deduplicated
- llm-traces
- data-curation
- parquet
- json
configs:
- config_name: default
  data_files:
  - split: train
    path: data/train.parquet
---

<p align="center">
  <img src="https://huggingface.co/datasets/Crownelius/Complete-FABLE.5-traces-2M/resolve/c6990bf1e5f394fdf5760a09ef9d2a0363697dfc/assets/fablelibrary.png" alt="Fable Library by Crownelius" width="100%">
</p>

<div align="center">

# Complete FABLE.5 Traces 2M

<strong>Full FABLE.5 / Mythos corpus restored, with session-limit answer rows removed.</strong>

[`Dataset Viewer`](https://huggingface.co/datasets/Crownelius/Complete-FABLE.5-traces-2M/viewer/default/train) | [`Parquet`](data/train.parquet) | [`Raw JSONL.gz`](raw/fable5_mythos_dedup.jsonl.gz)

</div>

This dataset is a post-closure compilation of all available FABLE.5 / Mythos trace datasets found on Hugging Face during the curation pass after the closure of Fable and Mythos. It is deduplicated at the normalized-row level and keeps row-level provenance through `first_source_dataset`, `first_source_config`, `first_source_split`, and `first_source_row_index`.

<div style="background:#041315;border:1px solid #13c8d3;border-radius:10px;padding:18px;margin:18px 0;color:#dffcff;">
  <div style="font-size:13px;text-transform:uppercase;letter-spacing:.18em;color:#91fff1;">Clean Corpus Snapshot</div>
  <div style="display:flex;flex-wrap:wrap;gap:12px;margin-top:14px;">
    <div style="min-width:160px;flex:1;border:1px solid #1f7f83;border-radius:8px;padding:12px;background:#071b1d;"><strong style="font-size:24px;color:#efffff;">2,006,487</strong><br><span>clean rows</span></div>

    <div style="min-width:160px;flex:1;border:1px solid #1f7f83;border-radius:8px;padding:12px;background:#071b1d;"><strong style="font-size:24px;color:#efffff;">604</strong><br><span>rows removed</span></div>

    <div style="min-width:160px;flex:1;border:1px solid #1f7f83;border-radius:8px;padding:12px;background:#071b1d;"><strong style="font-size:24px;color:#efffff;">1.94 GiB</strong><br><span>hosted payload</span></div>

  </div>

</div>


## What Changed

The full corpus export has been restored. Rows containing the session-limit assistant-answer pattern were removed from both downloadable files:

| File | Rows | Purpose |
| --- | ---: | --- |
| `data/train.parquet` | 2,006,487 | Viewer-friendly canonical Parquet split. |
| `raw/fable5_mythos_dedup.jsonl.gz` | 2,006,487 | Gzip-compressed canonical JSONL mirror of the Parquet schema with provenance fields plus original row JSON. |

The Parquet file is smaller because it is compressed columnar storage. The raw JSONL is gzip-compressed so the repository keeps the complete raw export without exposing sparse event fields as top-level blanks or storing redundant uncompressed text.

The repository is intentionally compact:

- `README.md`
- `data/train.parquet`
- `raw/fable5_mythos_dedup.jsonl.gz`

## Schema

| Column | Type | Description |
| --- | --- | --- |
| `row_hash` | string | SHA256 of the normalized original row JSON. |
| `first_source_dataset` | string | First dataset where this canonical row was observed. |
| `first_source_config` | string | First observed config or loader surface. |
| `first_source_split` | string | First observed split, file, or local extraction label. |
| `first_source_row_index` | int64 | Row index within the first observed source surface. |
| `seen_count` | int64 | Number of times this canonical row was seen during the pass. |
| `row_json` | string | Preserved original row as canonical JSON. Parse this for source-specific fields. |

## Source Citations

Every row can be traced back to the dataset where that canonical row was first observed. For rows with `seen_count` greater than `1`, the same canonical row appeared more than once during curation; the preserved `first_source_*` fields identify the citation source used for that row.

<details>
<summary><strong>Source dataset citation index: 17 Hugging Face datasets</strong></summary>

| Rows Citing Source | Source Dataset | Link |
| ---: | --- | --- |
| 1,100,000 | `attentionAllYouNeed/Vibe-Coding-Claude-Fable-5` | [dataset](https://huggingface.co/datasets/attentionAllYouNeed/Vibe-Coding-Claude-Fable-5) |
| 776,496 | `Poumrm/Mythos-5-and-Fabel-5-Class-Model-Outputs` | [dataset](https://huggingface.co/datasets/Poumrm/Mythos-5-and-Fabel-5-Class-Model-Outputs) |
| 40,215 | `BerkayBB/MythosAi` | [dataset](https://huggingface.co/datasets/BerkayBB/MythosAi) |
| 25,000 | `ansulev/claude_mythos_distilled_25k` | [dataset](https://huggingface.co/datasets/ansulev/claude_mythos_distilled_25k) |
| 22,904 | `1EYE4ALL/Fable-5-traces` | [dataset](https://huggingface.co/datasets/1EYE4ALL/Fable-5-traces) |
| 13,965 | `armand0e/claude-fable-5-claude-code` | [dataset](https://huggingface.co/datasets/armand0e/claude-fable-5-claude-code) |
| 7,635 | `desiree/mythos-coder-data` | [dataset](https://huggingface.co/datasets/desiree/mythos-coder-data) |
| 7,090 | `umm-maybe/wikisource-cthulhu-mythos` | [dataset](https://huggingface.co/datasets/umm-maybe/wikisource-cthulhu-mythos) |
| 4,571 | `Swarm-AI-Research/fable5-traces-sft` | [dataset](https://huggingface.co/datasets/Swarm-AI-Research/fable5-traces-sft) |
| 4,478 | `lordx64/agentic-distill-fable-5-sft` | [dataset](https://huggingface.co/datasets/lordx64/agentic-distill-fable-5-sft) |
| 1,021 | `victor/fable-5-boeing-747-trace` | [dataset](https://huggingface.co/datasets/victor/fable-5-boeing-747-trace) |
| 951 | `Glint-Research/mythosmini` | [dataset](https://huggingface.co/datasets/Glint-Research/mythosmini) |
| 603 | `PawanKrd/claude-fable-5-code` | [dataset](https://huggingface.co/datasets/PawanKrd/claude-fable-5-code) |
| 551 | `ox-ox/mythos-character-distillation` | [dataset](https://huggingface.co/datasets/ox-ox/mythos-character-distillation) |
| 468 | `TheFusionCube/Fable-5-CoT-Traces` | [dataset](https://huggingface.co/datasets/TheFusionCube/Fable-5-CoT-Traces) |
| 347 | `ronniealfaro/mythos` | [dataset](https://huggingface.co/datasets/ronniealfaro/mythos) |
| 192 | `HelioAI/Fable-5-Distill-Reasoning-462x` | [dataset](https://huggingface.co/datasets/HelioAI/Fable-5-Distill-Reasoning-462x) |

</details>

## Loading

```python

from datasets import load_dataset



ds = load_dataset("Crownelius/Complete-FABLE.5-traces-2M", split="train")

```