What is Repetition penalty?
Repetition penalty is an inference-time concept in large language model systems. It is part of the vocabulary teams use when they compare models, design prompts or review an AI system.
Definition
Repetition penalty is an inference-time concept in large language model systems. It is part of the vocabulary teams use when they compare models, design prompts or review an AI system. The term is used in inference discussions, where precision matters: two teams can use the same word to mean slightly different things. In this glossary, repetition penalty is treated as a practical concept rather than a formal specification.
Why it matters
Inference terms describe how a trained model turns a prompt into output: how tokens are sampled, cached and streamed. They drive latency, cost and the consistency of responses in production.
Example
Suppose you are comparing Mistral Large 3 Instruct with another model for a production task. Repetition penalty is one of the factors behind the numbers you see: Mistral Large 3 Instruct lists a 400,000-token context window, costs $5.31 per million input tokens and scores 76.2 on AIME 2025. Understanding the term helps you decide which of those differences actually matter for your workload.
How to evaluate it
- Check whether repetition penalty is defined the same way in the documentation you are reading.
- Ask which measurement or trade-off the term is describing before comparing numbers.
- Separate vendor claims from independently observed behaviour on your own data.
- Write down the definition your team uses so reviews and evaluations stay consistent.
Related terms
Related guides
FAQ
What does Repetition penalty mean?
Repetition penalty is an inference-time concept in large language model systems. It is part of the vocabulary teams use when they compare models, design prompts or review an AI system.
Why does Repetition penalty matter?
Inference terms describe how a trained model turns a prompt into output: how tokens are sampled, cached and streamed. They drive latency, cost and the consistency of responses in production.
How is Repetition penalty used in practice?
Suppose you are comparing Mistral Large 3 Instruct with another model for a production task. Repetition penalty is one of the factors behind the numbers you see: Mistral Large 3 Instruct lists a 400,000-token context window, costs $5.31 per million input tokens and scores 76.2 on AIME 2025. Understanding the term helps you decide which of those differences actually matter for your workload.