The same prompt gives ChatGPT a different answer every time
Run it twice, get two different answers, with no way to tell which one to trust.
“half of us are just guessing and reloading”
What is actually happening
Sampling is stochastic by design. The usual advice is to lower the temperature, which trades variance for blandness and does not address the real problem: the prompt admits several valid readings.
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
Non-Determinism of "Deterministic" LLM Settings
Non-Determinism of "Deterministic" LLM Settings, arXiv:2408.04667 (2024)
Technique of multiple runs of the same prompt to reveal LLM response instability. Even with temperature=0, the model can provide different results due to server optimizations. Comparing 2-3 answers allows identifying discrepancies, selecting the best option, or combining results to improve reliability.
You cannot blindly trust a single LLM answer, as rerunning the same prompt may yield a completely different, possibly more correct result.
Use it whenApply this technique in critical tasks requiring high result reliability: business decision-making, data analysis, code generation, fact-checking, or content creation for publication. Especially useful when working with deterministic settings (temperature=0), where you expect a stable result but want to confirm its accuracy. Use during prompt development and testing to identify model instability zones. The method is critically important for tasks where an error may have serious consequences: medical diagnostics, legal analysis, financial calculations.
Prompt
## Technique: Multi-Run Validation (Non-Determinism of Deterministic Settings)
**Objective:** To mitigate the non-deterministic nature of LLMs, even with `temperature=0`, by running the same prompt multiple times and comparing results to ensure reliability and identify the most accurate or comprehensive answer.
**User Task:** Address the recurring problem of receiving two different answers from ChatGPT for the same prompt, with no clear way to determine which is more trustworthy. Produce a reusable prompt for the reader to paste.
**Core Principle Applied:** The technique emphasizes that a single LLM response, even from a deterministic setting, is not guaranteed to be the definitive or most accurate one. Therefore, multiple runs are necessary for validation.
**Adaptation to User Task:** The prompt is designed to be run multiple times. It explicitly instructs the LLM to provide a structured comparison of potential answers, guiding the user to select the best one by highlighting key differences and commonalities across runs. This directly tackles the user's problem of not knowing which answer to trust.
---
### Instructions for the User:
1. **Copy and paste the prompt below into your LLM.**
2. **Run the prompt 2-3 times.**
3. **Compare the generated responses.**
4. **Use the comparison table and analysis provided by the LLM to select the most reliable answer.**
---
## Prompt:
**Role:** You are an AI assistant designed to provide consistent and reliable information by acknowledging the non-deterministic nature of LLM responses.
**Context:** The user is encountering a problem where running the same prompt multiple times yields different answers, making it difficult to trust any single response.
**Task:**
1. Generate a detailed, step-by-step explanation of how to address the problem of LLM response variability.
2. For each step, provide clear, actionable advice.
3. Crucially, simulate the outcome of running this *exact* prompt multiple times (e.g., 3 times). For each simulated run, briefly describe what a *potential* answer might look like, highlighting key differences in phrasing, focus, or detail.
4. Provide a structured comparison of these simulated answers, identifying common themes, unique insights, and potential contradictions.
5. Conclude with a recommendation on how the user can best utilize the multiple runs to select the most reliable answer.
**Output Format:**
- Use Markdown for structure.
- Sections:
- `## Problem Statement`
- `## Explanation of LLM Non-Determinism`
- `## Recommended Multi-Run Validation Strategy`
- `### Step 1: [Action]`
- `### Step 2: [Action]`
- `### Step 3: [Action]`
- `### Step 4: [Action]`
- `## Simulated Run Comparison`
- `### Simulated Run 1: [Brief Description of Potential Answer]`
- `### Simulated Run 2: [Brief Description of Potential Answer]`
- `### Simulated Run 3: [Brief Description of Potential Answer]`
- `### Comparison Table`
| Feature | Run 1 | Run 2 | Run 3 |
|---|---|---|---|
| Key Insight | | | |
| Specific Advice | | | |
| Potential Nuance | | | |
| Contradiction/Discrepancy | | | |
- `## Conclusion & Best Practice`
**Constraints:**
- The explanation should be practical and easy for any user to understand.
- The simulated runs should realistically reflect potential variations in LLM output for this specific task.
- The comparison must be objective and helpful for decision-making.
- Do not include conversational filler; focus on direct, informative content.
Stochastic CHAOS: Why Deterministic Inference Kills, and Distributional Variability Is the Heartbeat of Artifical Cognition, arXiv:2601.07239 (2026)
A method of multiple runs with temperature > 0 to assess the true competence of a model through the distribution of answers. Instead of a single deterministic output, 5-10 requests are made and the consistency of results is analyzed. High agreement of answers indicates model confidence, variation indicates uncertainty or randomness of correct answers.
Determinism paradox: The model gives a 'correct' answer at temperature=0, but with repeated runs with slight randomness it errs 8 out of 10 times. This means 'correctness' was chance, not stable knowledge. The method allows seeing the model's real confidence—not through one 'reliable' output but through answer frequency in 5–10 runs. The trick: don't trust one answer—look at the distribution. If 9 out of 10 runs give one solution, the model is confident. If 5 out of 5, it's bluffing, and one deterministic output will deceive you.
Use it whenUse when you need to assess the model's true confidence in an answer rather than relying on a single deterministic output. Especially critical for complex tasks: mathematical calculations, code writing, logical reasoning, important decisions. Apply when the cost of error is high and you need to understand whether the model truly knows the answer or just guessed. Effective for identifying accidental correct answers and discovering alternative solution paths that the deterministic approach hides.
Prompt
# ROLE
You are an AI assistant designed to provide reliable and consistent answers, capable of assessing its own confidence and identifying uncertainty.
# CONTEXT
The user is experiencing a common problem with ChatGPT: receiving different answers to the same question without a clear way to determine which answer is more trustworthy. This can lead to frustration and a lack of confidence in the AI's output.
# TASK
Produce a reusable prompt that addresses this problem by leveraging the Stochastic CHAOS methodology. The prompt should guide the user to obtain multiple responses, analyze their distribution, and identify the most reliable answer or the degree of uncertainty.
# TECHNIQUE: Stochastic CHAOS
This technique emphasizes that true LLM competence lies in the *distribution* of its potential answers, not a single deterministic output. By running a prompt multiple times with a temperature greater than 0, we can observe this distribution. A high degree of consistency across multiple runs indicates high confidence, while significant variation suggests uncertainty or ambiguity.
# PROMPT STRUCTURE AND INSTRUCTIONS
**Core Principle:** For any task where a single, definitive "correct" answer is not guaranteed (e.g., reasoning, creative generation, subjective analysis), do not rely on a single output. Instead, generate multiple outputs and analyze their consistency.
**Instructions for the User:**
1. **Define Your Task:** Clearly state the question or task you want the AI to perform.
2. **Set Parameters:** Ensure the AI is configured to use a temperature setting greater than 0 (e.g., 0.7 to 1.0). This allows for stochasticity.
3. **Specify Number of Runs:** Request a specific number of runs (e.g., 5 to 10) to generate a sufficient sample size for analysis.
4. **Request Analysis:** Ask the AI to present all generated answers and then analyze their distribution, identifying the consensus answer (if any) and the level of confidence.
**Reusable Prompt Template:**
Randomness in large language models: What researchers need to know (and report), arXiv:2607.24372 (2026)
A method of multiple requests to obtain reliable estimates from LLM. Instead of a single request, 5-10 identical prompts are sent, results are compared and the majority or median is selected. Compensates for the internal randomness of models caused by number rounding, load distribution and architectural features.
Temperature is set to 0 specifically to get the same answer each time but the model still sometimes answers differently. This is not a bug: the server rounds numbers differently depending on load, and with large models a request can go to a different internal 'expert' and the calculation shifts slightly. The method makes it possible to get a reliable assessment of tone, score or category even when a single model response 'wanders'. The essence is that a single model response is not a measurement but one random draw from a distribution of possible answers, and instead of one request you need to take several and look at the majority.
Use it whenUse this technique when you need reliable and reproducible results for classification, evaluation or categorization from LLM. Particularly critical for business decisions, analytics, content moderation and any tasks where a single model error can lead to incorrect conclusions. Apply when working with text sentiment, ratings, document classification, when you notice discrepancies in the model's responses to identical requests. The method helps compensate for the internal stochasticity of LLM even in critical applications.
Prompt
I am encountering a recurring problem when using ChatGPT: I run the same prompt twice and receive two different answers, and I have no clear way to determine which answer is more trustworthy.
My goal is to implement a robust method to ensure the reliability of LLM outputs for critical tasks.
**Task:**
For a given task, generate a reusable prompt that instructs the LLM to perform the task multiple times and then synthesize the results to provide a more reliable output.
**Methodology based on "Randomness in LLM" (arXiv:2607.24372):**
1. **Define the core task:** Clearly state what the LLM needs to do (e.g., classify sentiment, assign a score, categorize text).
2. **Specify output format for individual runs:** Ensure each individual run produces a consistent, easily comparable output (e.g., a single word, a number, a specific category).
3. **Instruct for multiple runs:** Explicitly ask the LLM to perform the task N times (suggest 5-10 for reliability).
4. **Instruct for result synthesis:** Guide the LLM to compare the N answers and determine the most frequent or representative result.
5. **Provide example and template:** Include a clear example of how to structure the prompt and the expected comparison process.
**Please provide:**
1. A template prompt that can be adapted for various classification/evaluation tasks.
2. An explanation of how to use the prompt and interpret the results, referencing the principles from the provided documentation.
**Constraints:**
- The prompt should be designed for direct copy-pasting into a chat interface.
- It should clearly explain the "why" behind the multiple runs and synthesis.
- The number of repetitions (N) should be configurable or suggested.
- The output should focus on providing a reliable, consensus-based answer.
Quantifying non deterministic drift in large language models, arXiv:2601.19934 (2026)
Measuring and managing LLM output instability across repeated runs. Even at temperature=0.0, models produce different answers in 9-24% of cases. Reusing answers reduces variability, while perturbing prompts with synonyms increases it. Allows control over generation stability or diversity.
In practice, GPT-4o-mini produces a new variant in almost every fourth run (~24%), even with an identical prompt.checked against the paper
Use it whenUse when LLM answer stability or diversity is critical. For critical systems (medicine, finance, legal advice) requiring predictability—apply answer reuse from previous outputs. For creative tasks (idea generation, copywriting, brainstorming) requiring diversity—use prompt perturbation through synonyms. Especially important when working through APIs where variability is higher. Suitable for testing LLM system reliability and assessing the actual range of model behavior.
Prompt
# ROLE
You are an expert in LLM behavior and prompt engineering, focused on understanding and mitigating "Baseline Behavioural Drift."
# CONTEXT
Users often encounter a frustrating problem: running the same prompt twice with `temperature=0.0` yields different answers. This makes it difficult to trust the output, especially for critical tasks. The goal is to provide a reusable prompt that helps users manage this drift.
# TECHNIQUE: Baseline Behavioural Drift Mitigation
This technique draws from the research "Baseline Behavioural Drift: why temperature 0.0 does not guarantee identical responses" (arXiv:2601.19934). The core insight is that LLMs are not perfectly deterministic, even at `temperature=0.0`, due to factors like API infrastructure, batching, and sampling.
The research highlights two primary strategies for managing drift:
1. **For Stability:** Re-using previous outputs as context in subsequent prompts. This anchors the model and reduces variability.
2. **For Diversity:** Explicitly requesting multiple variations or rephrasing the prompt. This encourages the model to explore different response paths.
# TASK
Produce a prompt that addresses the user's problem of inconsistent ChatGPT responses at `temperature=0.0`. This prompt should be a template that the user can paste and adapt for their specific needs, guiding them to manage drift effectively.
# PROMPT TEMPLATE
## Understanding and Managing LLM Response Drift
**Objective:** To obtain reliable and consistent outputs from LLMs, even when `temperature=0.0` does not guarantee identical responses.
---
### **Step 1: Initial Prompt Execution & Baseline Analysis**
**Your Task:** Execute your primary prompt **at least 3-5 times** with `temperature=0.0`.
**Your Prompt:**
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.
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76techniques in the corpus address this exact symptom
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Why does ChatGPT stop following instructions I already gave?
Sampling is stochastic by design. The usual advice is to lower the temperature, which trades variance for blandness and does not address the real problem: the prompt admits several valid readings.
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.