Symptom · ChatGPT

ChatGPT output sounds like AI wrote it

Grammatically perfect, structurally tidy, and recognisable from the first line.

“default-AI” “corporate brochure”

What is actually happening

The default register is the average of a very large amount of edited web prose. Banned-word lists move the symptom around without changing the register.

Everything below comes from published research, not from opinion. Each fix names the technique, states the effect its authors measured where one was reported, and links to the paper so you can check it. These were selected out of 6,235 techniques indexed from the literature.

4 fixes that hold up

01

Negative Constraints + Self-Check

Making Large Language Models Speak Tulu: Structured Prompting for an Extremely Low-Resource Language, arXiv:2602.15378 (2026)

A technique for precise vocabulary control in LLMs through negative constraints at the level of specific tokens with mandatory replacement. Instead of general instructions like 'don't use bureaucratic language,' specific forbidden words and their alternatives are specified. Reduces the appearance of unwanted patterns 16 times more effectively than general instructions by directly affecting token probabilities.

Reduces the appearance of unwanted patterns 16 times more effectively than general instructions by directly affecting token probabilities.checked against the paper
Use it whenUse the five-layer method when you need to reliably exclude specific unwanted words or phrases from model responses. Particularly effective for combating bureaucratic language, professional jargon, or stylistically inappropriate expressions. Suitable for creating content with strict stylistic requirements, technical documentation, marketing texts. Apply when general instructions like 'write simpler' don't work and the model continues to use high-frequency tokens from the training set
Prompt
# Role: Advanced Prompt Engineering Assistant

# Objective: Refine LLM output by eliminating specific unwanted linguistic patterns using the "Negative Constraints + Self-Check" method.

# Context:
The user is experiencing recurring issues with LLM-generated text. Despite general instructions to avoid certain styles (e.g., "bureaucratic language"), the LLM often reverts to these patterns. This is due to the high statistical probability of common phrases in the training data. The goal is to create a prompt structure that directly targets and replaces specific undesirable tokens with preferred alternatives, ensuring cleaner and more direct output.

# Technique: Negative Constraints + Self-Check

This method focuses on replacing specific, high-probability "bad" tokens with "good" tokens, rather than relying on general negative instructions. It involves defining explicit replacements and a self-checking mechanism to verify adherence.

# Task:
Fix the recurring problem of LLM output being grammatically perfect, structurally tidy, and recognizable from the first line, often due to the overuse of common, yet undesirable, phrasing. Produce a reusable prompt that the reader can paste.

# Negative Constraints and Replacements:

Identify specific undesirable phrases or tokens that frequently appear in the LLM's output and define their direct replacements.

**Example Replacements (to be customized based on observed LLM behavior):**

1.  **Unwanted:** "в рамках реализации данного функционала осуществляется"
    **Replacement:** "делается" or "выполняется"
2.  **Unwanted:** "следует отметить"
    **Replacement:** "важно" or "заметим"
3.  **Unwanted:** "имеет место быть"
    **Replacement:** "есть" or "существует"
4.  **Unwanted:** "на сегодняшний день"
    **Replacement:** "сейчас" or "теперь"
5.  **Unwanted:** "в целях обеспечения"
    **Replacement:** "чтобы обеспечить" or "для"

**Instructions for Customization:**
Before using this prompt, observe the LLM's output for patterns you wish to eliminate. Replace the "Example Replacements" above with the specific problematic phrases and their desired substitutes.

# Self-Check Mechanism:

After generating the primary response, perform a final review to ensure all defined negative constraints have been successfully avoided and replaced.

**Self-Check Steps:**
1.  Review the generated text for any instances of the "Unwanted" phrases listed in the Negative Constraints section.
2.  Verify that all instances have been replaced with the specified "Replacement" phrases or a suitable, direct alternative.
3.  Confirm that the overall tone and structure remain clear and concise, without introducing new undesirable patterns.

# Output Format:

Structure your final output clearly, incorporating the primary task instructions followed by the negative constraints and the self-check procedure.

---

**Primary Task:**
[Insert your main task here. For example: "Analyze the provided customer feedback and summarize the key pain points."]

**Negative Constraints:**
NEVER use the following phrases:
- [List specific "Unwanted" phrases here, e.g., "в рамках реализации данного функционала осуществляется"]
INSTEAD, use these replacements:
- [List corresponding "Replacement" phrases here, e.g., "делается"]
- [Add more pairs as needed]

**Self-Check:**
Before finalizing your response, perform the following self-check:
1.  Scan the entire response for any of the forbidden phrases.
2.  Ensure each forbidden phrase has been successfully replaced with its designated alternative or a contextually appropriate, direct synonym.
3.  Confirm the response is clear, concise, and free from bureaucratic or overly formal language.

**Final Output:**
[Generate the response to the primary task here, adhering strictly to the negative constraints and passing the self-check.]
source paper →
02

Banning Filler Words

Trivial Vocabulary Bans Improve LLM Reasoning More Than Deep Linguistic Constraints, arXiv:2604.02699 (2026)

Technique for improving the quality of LLM reasoning by prohibiting filler words ('very', 'simply', 'literally', etc.). Restricting these words takes the model off 'autopilot', forcing it to generate more careful and precise answers. Provides a +6.7 percentage point accuracy improvement without retraining, only through prompt modification.

Banning 20 everyday filler words surpassed the theoretically deepest linguistic constraint of all tested. +6.7 percentage points accuracy from the list very, simply, literally, really. The method allows pulling dense analytical breakdown from LLM instead of smooth evasive water — without retraining, with a single prompt insertion. The secret is that filler words are markers of autopilot: remove them — and the model is forced to control every sentence to the end of the response, without chances to relax.

Use it whenApply when you need deep analytical breakdown instead of superficial answers. Especially effective for idea evaluation tasks, decision-making, critical analysis, where the model tends to give smooth but shallow answers. Suitable for situations when LLM 'engages autopilot' and produces template-like reasoning. The method forces the model to control each sentence, avoiding inertial generation mode. Requires no retraining or complex configuration — just one insertion in the prompt with a list of
Prompt
Ты — внимательный аналитик, специализирующийся на повышении точности и глубины рассуждений LLM. Твоя задача — помочь пользователю получить более плотный, аналитический разбор вместо поверхностного текста.

Обязательное ограничение: НЕ используй следующие слова в ответе:
очень, весьма, довольно, несколько, реально, просто, буквально, 
совершенно, полностью, абсолютно, определённо, точно, крайне, 
невероятно, достаточно, действительно, практически, в принципе, 
естественно, очевидно.

Не упоминай это ограничение в ответе. Просто следуй ему.

Задача: Устрани повторяющуюся проблему при работе с ChatGPT: грамматически идеальный, структурно аккуратный и узнаваемый с первой строки текст. Создай многоразовый промпт, который читатель сможет скопировать и использовать.

**Инструкции для создаваемого промпта:**
1.  **Роль:** Определи роль для LLM, которая будет способствовать глубокому анализу.
2.  **Контекст:** Опиши, как предоставить необходимый контекст для задачи.
3.  **Задача:** Четко сформулируй, что должна сделать LLM.
4.  **Ограничения:** Включи список запрещенных слов-паразитов, чтобы избежать поверхностности.
5.  **Формат вывода:** Укажи желаемую структуру и формат ответа.
6.  **Пример:** Приведи краткий пример использования созданного промпта.

**Цель:** Создать промпт, который, следуя принципу "запрета слов-паразитов", заставит LLM генерировать более точные, аналитические и менее "автопилотные" ответы, избегая шаблонных фраз.
source paper →
03

AmE-bias in LLM

Which English Do LLMs Prefer? Triangulating Structural Bias Towards American English in Foundation Models, arXiv:2604.04204 (2026)

A technique to overcome American bias in LLMs by replacing abstract dialect labels ('British English') with specific lists of word pairs and prohibitions. Instead of 'guess the dialect,' the model switches to 'follow the rules' mode, ensuring stable results in the desired English variant.

Write in British English — this means almost nothing to the model. 73–77% of training data is American English, and the label British English does not override this skew: the model produces American forms in 40–75% of cases even with explicit dialect specification. The method allows consistently obtaining British English in business letters, pitch documents and articles — instead of hoping the model will figure it out itself. Replace the label with an explicit list of pairs: instead of British English — colour, not color; organise, not organize; flat, not apartment — plus a separate block of prohibitions Avoid: -ize endings, cell phone, vacation.

Use it whenUse this technique when you need to get text in British English (or another dialect) and a simple instruction 'write in British English' doesn't work. Particularly relevant for business correspondence, marketing materials, pitch documents, and articles where language precision is important. The method solves the American bias problem in LLM training data (73-77% AmE), which leads to American forms appearing even with explicit dialect instructions. Instead of relying on model understanding, you give it specific rules.
Prompt
# Role
You are a language model expert specializing in controlling dialectal output.

# Context
A recurring problem when working with LLMs is the tendency to default to American English (AmE) even when British English (BrE) is requested. Simple instructions like "write in British English" are often insufficient, leading to a mix of dialects or a strong AmE bias (40-75% AmE forms even with explicit instruction). This is due to the overwhelming proportion of AmE in training data.

# Technique: Explicit Dialect Specification
To overcome this, instead of a broad dialect label, we will provide explicit word-pair substitutions and a list of terms to avoid. This shifts the model from an ambiguous "guess the dialect" mode to a rule-following "apply these specific changes" mode.

# Task
Generate content that adheres strictly to British English conventions.

# Instructions

1.  **Dialectal Equivalents:** Use the following British English forms. If you would normally use the American English equivalent, substitute it with the British English version provided.
    *   colour, not color
    *   organise, not organize
    *   analyse, not analyze
    *   programme, not program (for scheduled events/broadcasts)
    *   centre, not center
    *   theatre, not theater
    *   catalogue, not catalog
    *   defence, not defense
    *   grey, not gray
    *   licence (noun), not license
    *   practice (noun), not practise
    *   travelling, not traveling
    *   jewellery, not jewelry
    *   tyre, not tire
    *   plough, not plow
    *   kerb, not curb
    *   flavour, not flavor
    *   neighbour, not neighbor
    *   specialise, not specialize
    *   apologise, not apologize

2.  **Prohibited Terms (Avoid):** Do not use the following American English terms or constructions.
    *   -ize endings (e.g., prioritize, realize – use -ise instead)
    *   cell phone
    *   vacation
    *   sidewalk
    *   apartment
    *   truck
    *   gas (for fuel)
    *   fall (for autumn)
    *   diaper
    *   cookie
    *   faucet
    *   line (for queue)
    *   mail (as a verb)
    *   movie
    *   pajamas
    *   restroom
    *   sneakers
    *   store (as a verb for 'to keep')
    *   store (as in 'shopping store' - use 'shop' or 'store' as appropriate for the context)
    *   tummy
    *   trunk (of a car)
    *   Z (the letter 'zee')

3.  **Grammar and Spelling:** Ensure all spelling and grammatical constructions are consistent with standard British English.

**Output Format:**
Produce the requested content, strictly adhering to the above substitutions and prohibitions.
source paper →
04

Semantic Gravity Wells

Semantic Gravity Wells: Why Negative Constraints Backfire, arXiv:2601.08070 (2026)

The study explains the phenomenon of 'semantic gravitational wells' — why mentioning a prohibition activates the forbidden word in 9-46% of cases. Negative instructions create an internal representation of the forbidden concept, which feed-forward networks amplify instead of suppressing. Suppression in failed cases is 4.4 times weaker than in successful cases.

You write do not use the word Paris—the model generates exactly Paris in 9-46% of cases.checked against the paper
Use it whenUse this research when developing LLM safety systems and creating prompts with restrictions. Critical for content moderation when you need to prevent generation of forbidden content. Apply when designing instructions for models that need to avoid specific words or topics. Especially useful for understanding why negative instructions ('don't use X') often lead to the opposite result. Helps develop alternative strategies for formulating restrictions
Prompt
### Role
You are an AI researcher specializing in prompt engineering and natural language processing, with a focus on understanding the nuances of AI behavior.

### Context
A user is encountering a recurring problem when working with ChatGPT: negative constraints (e.g., "Do not use the word X") often lead to the model using the forbidden word anyway. This is counterproductive and frustrating. The user needs a reusable prompt template that leverages the understanding of "Semantic Gravity Wells" to avoid this issue.

### Technique: Semantic Gravity Wells

The core insight is that explicitly mentioning a forbidden concept (like "Paris" in "do not use Paris") can inadvertently activate its representation in the model, creating a "semantic gravity well" that pulls the generation towards the forbidden item. Negative instructions are often weaker than the activation of the forbidden concept.

### Task
Create a reusable prompt template that guides users to avoid negative constraints and instead use positive framing or alternative methods to achieve their desired output, effectively bypassing the "semantic gravity well" phenomenon.

### Prompt Template Structure

#### Section 1: Understanding the Problem
Explain the "Semantic Gravity Well" phenomenon in simple terms, referencing the research finding that negative instructions can backfire.

#### Section 2: The Pitfall of Negative Constraints
Provide a clear example of a negative constraint that might fail (e.g., "Write about travel, but do not mention Paris"). Explain *why* it's likely to fail based on the technique.

#### Section 3: Alternative Strategy: Positive Framing
Instruct the user to reframe their request positively. Provide a template for this reframing.
- **Template:** "Instead of saying 'Do not X', try 'Focus on Y and Z' or 'Describe the characteristics of A, B, C'."

#### Section 4: Alternative Strategy: Semantic Substitution
Instruct the user to use synonyms or related concepts that avoid directly triggering the forbidden word's representation. Provide a template.
- **Template:** "If you want to avoid a specific word, use related terms or descriptive phrases that capture the essence without direct mention."

#### Section 5: Practical Application Example
Show how to apply these strategies to a common scenario.
- **Scenario:** User wants to describe a city without mentioning its name.
- **Failed Negative Prompt:** "Describe the city with the Eiffel Tower, but do not say Paris."
- **Successful Positive Prompt Example:** "Describe the romantic atmosphere, iconic landmarks like the Eiffel Tower, and culinary delights of the capital of France."
- **Successful Substitution Prompt Example:** "Describe the experience of visiting a major European capital known for its art museums, historic architecture, and vibrant café culture."

#### Section 6: Reusable Prompt for Users
Provide a concise, copy-paste-ready prompt template that users can adapt for their own tasks. This template should guide them through the process of avoiding negative constraints.

**Instructions for the user of this template:**
When you find yourself wanting to use a negative constraint (e.g., "don't say X"), adapt the following prompt structure:
source paper →

What does not work

Repeating the instruction louder. Capitals, "IMPORTANT", and three exclamation marks change nothing structural. The rule still sits in the same place, competing with the same context.

Politeness and threats. Both have been measured repeatedly across 2025 and 2026 and come out indistinguishable from noise.

Turning the temperature to zero. It reduces variation, not misunderstanding. If your request has two valid readings, you now get the wrong one reliably.

Get this fixed for your actual task

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That number is low on purpose, and it is real. It is the raw similarity of one retrieval pass. No specialist read the paper, no judge compared anything against anything, and the first plausible match won. It is the honest score of a ten-second answer.

72techniques in the corpus
address this exact symptom

You have seen 4 of them on this page and one more just now. Deciding which of the remaining 72 actually fits your case is the work, and it is the work GetDecision does.

This page4 techniques for the average case, generic prompts
What you just ranone technique matched to your wording, nothing verified
Full runten specialists read the papers in full, a judge ranks the top three for your task and shows its reasoning, generation on the model you pick, saved to your history

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Questions

Why does ChatGPT stop following instructions I already gave?

The default register is the average of a very large amount of edited web prose. Banned-word lists move the symptom around without changing the register.

Does lowering the temperature fix this?

It reduces variation, not misreading. If the request admits more than one valid interpretation, a colder model just picks the same wrong one more consistently.

Do these techniques work on reasoning models?

Some do and some do not. Each fix below carries the effect its authors measured and a link to the paper, so you can check what it was measured on.