The AI-native wire format for structured data. 100% comprehension on every frontier model. 50-92% fewer tokens than JSON. 43B+ lossless round-trips across 17 formats. Spec v3.5.1 Stable.
Latest release v3.5.3 — GCF Spec v3.5.3 — canonical int64 numeric domain · 15 Aug 2026
1 file for Claude Code: gcf CLAUDE.md — 2,473 tokens loaded in every session.
CLAUDE.md A 2,473 tok These files are blackwell-systems/gcf's own configuration — they tell Claude Code how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.