--- title: What Is a Token in AI? An Explainer | daily.dev description: Tokens are the fundamental units AI models use to process text — they can represent full words, subwords, characters, or short phrases. Before any text reaches... canonical: https://daily.dev/posts/what-is-a-token-in-ai-an-explainer-a3xndppfv twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: What Is a Token in AI? An Explainer | daily.dev og:description: Tokens are the fundamental units AI models use to process text — they can represent full words, subwords, characters, or short phrases. Before any text reaches... og:url: https://daily.dev/posts/what-is-a-token-in-ai-an-explainer-a3xndppfv og:image: https://api.daily.dev/og/posts/A3XNDpPFv.png og:image:alt: What Is a Token in AI? An Explainer og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # What Is a Token in AI? An Explainer **[Couchbase](https://daily.dev/sources/couchbase)** · 11 min read · 0 upvotes · 0 comments ## Summary Tokens are the fundamental units AI models use to process text — they can represent full words, subwords, characters, or short phrases. Before any text reaches an LLM, a tokenizer breaks it into these segments and maps them to numerical IDs. Modern LLMs use subword tokenization to balance vocabulary size and computational efficiency. Token counts directly affect context windows (how much a model can 'remember'), inference costs (billed per input/output token), latency (models generate one token at a time), and output quality (the 'lost in the middle' problem). For developers, understanding tokens is critical for writing efficient prompts, chunking data for RAG pipelines, and forecasting infrastructure costs. Roughly 750 words equal 1,000 tokens, and different models tokenize the same text differently. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [What are Tokens in LLMs](https://daily.dev/posts/what-are-tokens-in-llms-dx7hq5jhb) · Medium · 0 upvotes · 0 comments - [AI Crash Course: Tokens, Prediction and Temperature](https://daily.dev/posts/ai-crash-course-tokens-prediction-and-temperature-tm854yntp) · Telerik · 1 upvotes · 0 comments - [How AI “remembers”, and what it means for you as a builder — Part 1](https://daily.dev/posts/how-ai-remembers-and-what-it-means-for-you-as-a-builder-part-1-ys0tkuavv) · UX Planet · 1 upvotes · 0 comments - [The Real Token Economy Is Not About Spending Less. It Is About Thinking Smaller.](https://daily.dev/posts/the-real-token-economy-is-not-about-spending-less-it-is-about-thinking-smaller--nmhc4y3yc) · DEV · 6 upvotes · 0 comments --- Tags: [#llm](https://daily.dev/tags/llm), [#nlp](https://daily.dev/tags/nlp), [#rag](https://daily.dev/tags/rag), [#prompt-engineering](https://daily.dev/tags/prompt-engineering) [View this post on daily.dev](https://daily.dev/posts/what-is-a-token-in-ai-an-explainer-a3xndppfv) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"What Is a Token in AI? 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