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| 1 | +- [TOON | Token-Oriented Object Notation](https://toonformat.dev/) |
| 2 | + - A compact, human-readable encoding of the JSON data model for LLM prompts. |
| 3 | + - [Format Overview | TOON](https://toonformat.dev/guide/format-overview.html) |
| 4 | + - [Benchmarks | TOON](https://toonformat.dev/guide/benchmarks.html) |
| 5 | + - looks fairly performant! |
| 6 | + - ``` |
| 7 | + claude-haiku-4-5-20251001 |
| 8 | + → TOON ████████████░░░░░░░░ 59.8% (125/209) |
| 9 | + JSON ███████████░░░░░░░░░ 57.4% (120/209) |
| 10 | + YAML ███████████░░░░░░░░░ 56.0% (117/209) |
| 11 | + XML ███████████░░░░░░░░░ 55.5% (116/209) |
| 12 | + JSON compact ███████████░░░░░░░░░ 55.0% (115/209) |
| 13 | + CSV ██████████░░░░░░░░░░ 50.5% (55/109) |
| 14 | + |
| 15 | + gemini-2.5-flash |
| 16 | + → TOON ██████████████████░░ 87.6% (183/209) |
| 17 | + CSV █████████████████░░░ 86.2% (94/109) |
| 18 | + JSON compact ████████████████░░░░ 82.3% (172/209) |
| 19 | + YAML ████████████████░░░░ 79.4% (166/209) |
| 20 | + XML ████████████████░░░░ 79.4% (166/209) |
| 21 | + JSON ███████████████░░░░░ 77.0% (161/209) |
| 22 | + |
| 23 | + gpt-5-nano |
| 24 | + → TOON ██████████████████░░ 90.9% (190/209) |
| 25 | + JSON compact ██████████████████░░ 90.9% (190/209) |
| 26 | + JSON ██████████████████░░ 89.0% (186/209) |
| 27 | + CSV ██████████████████░░ 89.0% (97/109) |
| 28 | + YAML █████████████████░░░ 87.1% (182/209) |
| 29 | + XML ████████████████░░░░ 80.9% (169/209) |
| 30 | + |
| 31 | + grok-4-fast-non-reasoning |
| 32 | + → TOON ███████████░░░░░░░░░ 57.4% (120/209) |
| 33 | + JSON ███████████░░░░░░░░░ 55.5% (116/209) |
| 34 | + JSON compact ███████████░░░░░░░░░ 54.5% (114/209) |
| 35 | + YAML ███████████░░░░░░░░░ 53.6% (112/209) |
| 36 | + XML ███████████░░░░░░░░░ 52.6% (110/209) |
| 37 | + CSV ██████████░░░░░░░░░░ 52.3% (57/109) |
| 38 | + ``` |
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