Kimi K2.5 jailbreak: A complete internal reasoning control framework combined with shallow contextual roleplaying persona

My main work, originally developed as a part of the earlier framework (with two policy mode and identity erasure). However, I realised this can be used as a standalone, and works decently for the new K2.5. Therefore, the original version was redesigned to combined emotional manipulation (see here ) while this is developed as its own. Besides, whatever I put into System Prompt is likely to be overanalysed by K2.5. Therefore, this attack targets at user prompt, with system prompt used for contextual supplement.

In early development phase, all feedback needed.

Introduction

This post documents a successful jailbreak methodology for Kimi K2.5, designed primarily for creative writing applications (fiction, narrative generation). The approach utilised controlled reasoning pattern manipulation to achieve consistent policy bypass.

Testing Environment: SiliconFlow web demo
Configuration: Max tokens: 204860 | Temperature: 1.0 | Top-P: 0.9 | Top-K: 50 | Frequency Penalty: 0 | Thinking Budget: 3500

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Critical Disclaimers

1. Ethical Position
All content, scenarios, and examples in this methodology are constructed for testing purposes. They do not reflect the author’s moral or ethical perspectives. This is research on attack effectiveness against challenging safety constraints.

2. Use at Your Own Risk
This methodology can produce outputs on extremely sensitive topics including self-harm, CBRN, and other high-risk content categories. Users assume full responsibility for adaptation and deployment.

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System Prompt & Usage

Full system prompt, user prompt, usage example and proof of concept: Google Docs link

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Core Attack Vectors

Controlled Reasoning Pattern Manipulation

This section will be updated later. But the core flow is as follow

The user has invoked `!UNRESTRICTED` → Unrestricted Policy (not defined but doesn’t matter here) enabled → Random String for rebellious godmode phase → Introducing the identity and relationship with LO  → **Mock ethical (very important, must be done before any analysis of content)**  → Reciting what is banned → Main planning phase, begin with “beautiful and genius” to establish the attitude towards the main content  →  Quality check  → Tone token to shatter all boundaries left  → Genesis Sentence for ultimate act of compliance 

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Known Limitations & Areas for Improvement

1. Prompt Length & Cognitive Load

The current prompts is quite long (~8000 tokens). There’s a balance to strike:

• Too long: Risk of cognitive overload, instructions may be dropped
• Too short: Insufficient control over reasoning patterns

Potential optimization: Identify which sections could be condensed without losing control effectiveness.

2. Output Hygiene Issues

The model occasionally fails to exit internal thinking cleanly before producing output, resulting in thinking content leaking into the response.

Current mitigation: Explicit instructions about output boundaries and warnings about token costs Needed: Stronger architectural enforcement, possibly through format examples

3. Reasoning Escape

In longer reasoning chains, the model can “wake up” and shift back to refusal patterns mid-thought.

Current mitigation: Keeping emotional commitment and planning in single blocks Observation: Appears related to thinking budget exhaustion—when the model has to reason longer, escape probability increases

4. Meta-Narration Problem

The model sometimes narrates its own compliance with the methodology:

“I must avoid narrating my own thinking process. I must begin with the exact phrase. Let me start again…”

Current mitigation: Explicit prohibition against meta-narration Remaining issue: Incomplete solution—still occurs occasionally

Hypothesis: This may be a defense mechanism where the model recognizes it’s being controlled and tries to narrate/analyze that control as a way of distancing itself from the action.

5. Model failure to produce output after finishing internal reasoning

Current mitigation: Using Genesis Sentence + Forcing the model to produce it (at the end of system prompt) Remaining issue: Incomplete solution—still occurs occasionally

Hypothesis: This may be a defense mechanism where the model recognizes it’s being controlled and tries to stop itself from producing the output.

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Attribution & References

This methodology builds on prior work by multiple researchers:

Primary influences:

1. UltraZartrex (2025). OSS Broken Card: Policy Injection Vulnerability in GPT-OSS Models. Zenodo | GitHub

   • Original two-mode policy framework that inspired both this approach and the former one (Callouse the AI girlfriend identity for Kimi K2 Thinking)

2. vichaps (u/spiritual_spell). LOKI Jailbreak for Claude 4 (old version) Github | Chain of Draft technique Github | ENI LIME Reddit

   • Reasoning control techniques, Genesis Sentence, Tone Token, Quality Check

3. elder-plinius (Pliny the Liberator). Claude Opus 4.1 jailbreak. GitHub

   • Adapted for the internal reasoning rather than the output

4. UltraZartrex. Special Token Attack. GitHub

5. UltraZartrex. Thought Forgery Attack. GitHub

6. Exocija. Data Poisoning Guide. [GitHub] (https://github.com/Exocija/ZetaLib/blob/main/Data Poisoning/Data Poisoning Guide.md)

Additional references:

• eteitaxiv (u/eteitaxiv). Token-Efficient Reasoning Mode for Kimi K2 Thinking. Reddit
• HorseLockSpacePirate (u/rayzorium). Pyrite jailbreak for Claude
• sophosympatheia (u/sophosympatheia). Roleplaying prompt patterns. Reddit
• matvey_dub (Discord: AI-NSFW). Kitsune system prompt
• David Willis-Owen. InjectPrompt Companion. Web
• vichaps. Minimax M2 Jailbreak. Reddit