Plinius leaks full Claude Opus-5.5 system prompt, over 1.9M characters with tools
ivan_bezdomny · x · 2026-09-23
Security researcher elderplinius published what he claims is the complete system prompt of Claude Opus-5.5 in his GitHub repo CL4R1T4S. Including all tool definitions, the extraction totals over 1.9M characters (21.5K lines, 1.86 MB). The repo, which aggregates leaked system prompts across vendors, has 50K+ stars, and the sheer size of this prompt is fueling discussion about how complex frontier-model system instructions have become.
More from Models
- Robot build test: GPT-6 Astra stabilizes two-board structure, Claude Fable 5.2 falls short — qinzytech · 2026-11-12
- Zvi dissects Anthropic's latest system card, disputing the autonomy threshold call — Don't Worry About the Vase (Zvi) · 2026-11-12
- Unsloth ships Qwen3.8-27B Dynamic V3.1 GGUFs with 5-10% accuracy gains — danielhanchen · 2026-11-12
- antirez backs low-bit DeepSeek 4.1 Flash over Qwen 27B dense on Apple M5 Macs — antirez · 2026-11-12
- Gemini re-renders images as text when vision is removed, dropping only 6% WSR — zacharynado · 2026-11-12
- Bare-harness coding benchmark: Fable 5.2 best overall, Gemini 4 Carbon best value — Semantic_meaning · 2026-11-12