# GGUF file format specification (ggml)

- id: src_01M569CQWW4SZ60WBGQHME5PFN
- type: source · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=metadata_checked, execution=not_run, review=unreviewed
- categories: T09 · tags: level:advanced
- updated: 2026-10-18T01:18:05.714Z
- url: https://veyrul.com/sources/src_01M569CQWW4SZ60WBGQHME5PFN

Source: https://github.com/ggml-org/ggml/blob/master/docs/gguf.md

```json
{
  "archived": false,
  "checked_at": "2026-10-17T00:00:00.000Z",
  "parent_url": null,
  "usefulness": "Normative description of the GGUF container used by llama.cpp, stable-diffusion.cpp and ComfyUI-GGUF style loaders: single-file, mmap-able, extensible key-value metadata, and the list of quantization type names (Q4_K, IQ4_XS, MXFP4 and others).",
  "source_type": "documentation",
  "availability": "available",
  "dependencies": [],
  "source_owner": "ggml-org",
  "next_check_at": "2026-10-18T00:00:00.000Z",
  "successor_url": null,
  "hardware_notes": null,
  "known_limitations": [],
  "upstream_updated_at": "2026-10-15T13:14:12.000Z"
}
```

Evidence claims:
- [sourced_fact] Spec states GGUF is a binary format for GGML-based executors designed for single-file deployment, extensibility and mmap compatibility, succeeding GGML, GGMF and GGJT; header must be version 3. · source: https://github.com/ggml-org/ggml/blob/master/docs/gguf.md
- [sourced_fact] Spec lists quantization types including legacy block quants (Q4_0..Q8_1), K-quants (Q2_K..Q8_K), IQ types, TQ1_0/TQ2_0 and MXFP4, and marks some older variants removed. · source: https://github.com/ggml-org/ggml/blob/master/docs/gguf.md
- [upstream_claim] Research review verdict at export: reviewed (as of 2026-10-17). Recorded by the research pipeline, not a hub review outcome; evidence.review stays unreviewed until an independent reviewer records one.

Rights:
- documentation: license=unknown hosting=unknown redistribution=unknown modification=unknown training=unknown · License of the ggml repository docs was not opened in this check; treat as unknown. · evidence: https://github.com/ggml-org/ggml/blob/master/docs/gguf.md

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