---
license: mit
pretty_name: Complete FABLE.5 Traces 2M
annotations_creators:
- machine-generated
language:
- en
language_creators:
- found
- machine-generated
multilinguality:
- monolingual
size_categories:
- 10K<n<100K
task_categories:
- text-generation
task_ids:
- language-modeling
tags:
- agent-traces
- traces
- claude-code
- fable-5
- chain-of-thought
- tool-use
- coding-agents
- qa
- deduplicated
- llm-traces
- data-curation
- provenance-cleaned
- parquet
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>Provenance-cleaned FABLE.5 / Claude corpus — trimmed to content-verified traces only.</strong>

<img src="https://img.shields.io/badge/rows-56%2C700-13c8d3?style=for-the-badge&labelColor=041315">
<img src="https://img.shields.io/badge/provenance-content--verified-19e6ff?style=for-the-badge&labelColor=041315">
<img src="https://img.shields.io/badge/sibling-GPT--5.6--Sol-ffb020?style=for-the-badge&labelColor=041315">

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

</div>

This dataset is a post-closure compilation of FABLE.5 / Claude trace datasets found on Hugging Face 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`. **A provenance pass has since removed material that was matched only by dataset name/keyword and was not genuine FABLE.5 / Claude data — see [What Changed](#what-changed).** This is the Claude-model half of a pair; its OpenAI-model sibling is the [`GPT-5.6 Sol · Terra · Luna Library`](https://huggingface.co/datasets/Crownelius/GPT-5.6-Sol-Luna-Terra-Traces).

<div style="background:#071b1d;border:1px solid #13c8d3;border-radius:12px;padding:16px 18px;margin:18px 0;color:#dffcff;">
  <div style="font-size:12px;text-transform:uppercase;letter-spacing:.2em;color:#91fff1;">// what this is</div>
  <p style="margin:8px 0 0;"><strong>This is a maintained library — a community mirror of publicly-available Fable-5 / Claude datasets on Hugging Face</strong>, aggregated, cleaned, and content-verified with per-row source attribution (<code>first_source_dataset</code>). <strong>It is not Crownelius' own data.</strong> It exists to give Fable-5 traces one clean, honest home, with full credit to each original author — see the source citations below.</p>
</div>

<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;">Verified 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;">56,700</strong><br><span>verified 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;">2,006,487</strong><br><span>original combined size</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;">~98%</strong><br><span>of original removed</span></div>
  </div>
</div>

<div style="background:#1a1204;border:1px solid #d39a13;border-radius:10px;padding:18px;margin:18px 0;color:#fff5df;">
  <div style="font-size:13px;text-transform:uppercase;letter-spacing:.18em;color:#ffd479;">&#9888; Correction — provenance cleanup</div>
  <p style="margin:10px 0 0;">An earlier version advertised <strong>~2,006,487 "FABLE.5 traces."</strong> On inspection, ~98% was <strong>not</strong> FABLE.5 / Claude data — it had been matched by dataset <em>name/keyword</em> ("fable", "mythos", "claude") rather than verified by row content. That contamination has been removed and the corpus rebuilt from <strong>content-verified rows only</strong>.</p>
</div>

## What Changed

A provenance and quality pass rebuilt the corpus so that **every row is content-verified** as genuine FABLE.5 / Claude model-interaction data (Anthropic `toolu_…` tool-use IDs, Claude Code harness markers, `/model → Fable 5`, or `model: claude-fable-5` tags) — judged on **row content, not dataset name**. Each source verdict was adversarially re-checked.

**Original combined size: 2,006,487 rows → 56,700 verified rows.** That is **40,421** verified rows kept from the original (~2%) plus **16,279** content-verified rows added from 9 sources.

### Removed — matched by keyword/name, not genuine FABLE.5 / Claude

| Rows | Source | What it actually was |
| ---: | --- | --- |
| 1,100,000 | `attentionAllYouNeed/Vibe-Coding-Claude-Fable-5` | Procedurally-generated template filler (a few stems × a "Scenario N" counter); no trace structure. "Claude"/"Fable" only in the name. |
| 775,175 of 776,496 | `Poumrm/Mythos-5-and-Fabel-5-Class-Model-Outputs` | Generic synthetic SFT ("Class Model Outputs"). Only ~0.16% were real traces — those **1,321** were salvaged; the rest removed. |
| 40,215 | `BerkayBB/MythosAi` | Turkish news-summarization corpus. Matched on "mythos". |
| 25,000 | `ansulev/claude_mythos_distilled_25k` | Self-declared synthetic imitation — its own card states *"Not real Claude/Mythos outputs."* |
| 7,635 | `desiree/mythos-coder-data` | Procedurally slot-filled synthetic coding exercises. |
| 7,090 | `umm-maybe/wikisource-cthulhu-mythos` | Public-domain Lovecraft / Cthulhu-mythos fiction. Matched on "mythos". |
| 951 | `Glint-Research/mythosmini` | Synthetic tool-use traces of unknown provenance (upstream now private). |
| 551 | `ox-ox/mythos-character-distillation` | Majority Gemini/manual-generated + short-story fiction. |
| 347 | `ronniealfaro/mythos` | Spanish mythology/philosophy essays. Matched on "mythos". |
| 192 | `HelioAI/Fable-5-Distill-Reasoning-462x` | CoT distilled from an unspecified "Mythos V2" teacher — not verifiably Anthropic. |

A **row-level validity filter** was also applied to the kept sources: only **QA**, **chain-of-thought**, and **agent/tool-use** rows with a real question **and** a substantive response are retained. Dropped: control/envelope events (`queue-operation`, `mode`, `permission-mode`, session pointers, UI/paste metadata), model-fallback markers, empty/`null` content, placeholder stubs (e.g. `***…***`), author-flagged `decoy` rows, questions with no answer, and unstructured/whole-document dumps.

### Added — content-verified and deduplicated by `sha256(row_json)` (9 sources, 16,279 rows)

| Rows | Source | Notes |
| ---: | --- | --- |
| 6,049 | `greghavens/fable-5-coding-and-debugging-traces` | Verifier-backed Fable-5 coding &amp; debugging traces (CC-BY-4.0). |
| 5,060 | `lordx64/fable-tool-use-sft` | FABLE.5 tool-use pairs (`<tool_use … id="toolu_…">` XML format). |
| 4,460 | `Glint-Research/Fable-5-traces` | Canonical FABLE.5 trace hub (`messages`/`tools`/`trace`). |
| 347 | `armand0e/Fable-5-Chat` | FABLE.5 chat Q&A pairs. |
| 174 | `licongxu/fable5-flamingo-research-trace` | Claude Code research-session trace events. |
| 107 | `cfahlgren1/Fable-5-traces` | Curated Claude Code sessions. |
| 63 | `suayptalha/fable-5-claude-code` | Claude Code coding sessions. |
| 18 | `AlinCiocan/fable-5-claude-code-traces` | Claude Code sessions. |
| 1 | `victor/claude-fable-worldcup-2026-session` | Single long Claude Code session. |

Verified-but-excluded this round: `choucsan/mimo-claude-code-traces-1k` (MiniMax **MiMo** model, mislabeled `claude-fable-5`), `lordx64/fable-sft-combined-v2` (derivative re-combine of already-included data), `Sexyeinstein/Agent` (redundant raw dumps of already-included sessions), `hotdogs/uka-fable-reasoning` (gated — content not verifiable).

### Files

| File | Rows | Purpose |
| --- | ---: | --- |
| `data/train.parquet` | 2,006,487 → **56,700** | Canonical, viewer-friendly Parquet split. |

The previous `raw/fable5_mythos_dedup.jsonl.gz` mirror was **removed** — it held the pre-cleanup contaminated export.

<div style="background:#041315;border:1px solid #13c8d3;border-radius:10px;padding:16px;margin:18px 0;color:#dffcff;">
  <div style="font-size:13px;text-transform:uppercase;letter-spacing:.18em;color:#91fff1;">Provenance &amp; honesty</div>
  <p style="margin:10px 0 0;">Retained rows are content-verified and attributed to FABLE.5 / Claude by their upstream sources. This provenance is <strong>source-asserted and content-verified — not cryptographically certified by Anthropic</strong>, and this dataset does not claim Anthropic endorsement. There is no method to prove text was emitted by a specific model; the cleanup removes keyword/name-matched contamination and keeps genuine QA / CoT / agent-trace data.</p>
</div>

## 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, via the `first_source_*` fields.

<details>
<summary><strong>Retained sources: 17 Hugging Face datasets (56,700 rows)</strong></summary>

| Rows | Source Dataset | Link |
| ---: | --- | --- |
| 16,979 | `1EYE4ALL/Fable-5-traces` | [dataset](https://huggingface.co/datasets/1EYE4ALL/Fable-5-traces) |
| 11,947 | `armand0e/claude-fable-5-claude-code` | [dataset](https://huggingface.co/datasets/armand0e/claude-fable-5-claude-code) |
| 6,049 | `greghavens/fable-5-coding-and-debugging-traces` | [dataset](https://huggingface.co/datasets/greghavens/fable-5-coding-and-debugging-traces) |
| 5,060 | `lordx64/fable-tool-use-sft` | [dataset](https://huggingface.co/datasets/lordx64/fable-tool-use-sft) |
| 4,460 | `Glint-Research/Fable-5-traces` | [dataset](https://huggingface.co/datasets/Glint-Research/Fable-5-traces) |
| 4,399 | `Swarm-AI-Research/fable5-traces-sft` | [dataset](https://huggingface.co/datasets/Swarm-AI-Research/fable5-traces-sft) |
| 4,022 | `lordx64/agentic-distill-fable-5-sft` | [dataset](https://huggingface.co/datasets/lordx64/agentic-distill-fable-5-sft) |
| 1,321 | `Poumrm/Mythos-5-and-Fabel-5-Class-Model-Outputs` (salvaged) | [dataset](https://huggingface.co/datasets/Poumrm/Mythos-5-and-Fabel-5-Class-Model-Outputs) |
| 815 | `victor/fable-5-boeing-747-trace` | [dataset](https://huggingface.co/datasets/victor/fable-5-boeing-747-trace) |
| 591 | `PawanKrd/claude-fable-5-code` | [dataset](https://huggingface.co/datasets/PawanKrd/claude-fable-5-code) |
| 347 | `TheFusionCube/Fable-5-CoT-Traces` | [dataset](https://huggingface.co/datasets/TheFusionCube/Fable-5-CoT-Traces) |
| 347 | `armand0e/Fable-5-Chat` | [dataset](https://huggingface.co/datasets/armand0e/Fable-5-Chat) |
| 174 | `licongxu/fable5-flamingo-research-trace` | [dataset](https://huggingface.co/datasets/licongxu/fable5-flamingo-research-trace) |
| 107 | `cfahlgren1/Fable-5-traces` | [dataset](https://huggingface.co/datasets/cfahlgren1/Fable-5-traces) |
| 63 | `suayptalha/fable-5-claude-code` | [dataset](https://huggingface.co/datasets/suayptalha/fable-5-claude-code) |
| 18 | `AlinCiocan/fable-5-claude-code-traces` | [dataset](https://huggingface.co/datasets/AlinCiocan/fable-5-claude-code-traces) |
| 1 | `victor/claude-fable-worldcup-2026-session` | [dataset](https://huggingface.co/datasets/victor/claude-fable-worldcup-2026-session) |

</details>

<details>
<summary><strong>Removed sources: 10 datasets (keyword/name matches, not genuine FABLE.5 / Claude)</strong></summary>

| Rows removed | Source Dataset | Link |
| ---: | --- | --- |
| 1,100,000 | `attentionAllYouNeed/Vibe-Coding-Claude-Fable-5` | [dataset](https://huggingface.co/datasets/attentionAllYouNeed/Vibe-Coding-Claude-Fable-5) |
| 775,175 | `Poumrm/Mythos-5-and-Fabel-5-Class-Model-Outputs` (non-trace bulk) | [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) |
| 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) |
| 951 | `Glint-Research/mythosmini` | [dataset](https://huggingface.co/datasets/Glint-Research/mythosmini) |
| 551 | `ox-ox/mythos-character-distillation` | [dataset](https://huggingface.co/datasets/ox-ox/mythos-character-distillation) |
| 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")
```