--- title: How Roblox Uses AI to Translate 16 Languages in 100... description: Roblox built a single unified transformer-based translation model using Mixture of Experts (MoE) architecture to handle all 256 language direction pairs across... canonical: https://daily.dev/posts/how-roblox-uses-ai-to-translate-16-languages-in-100-milliseconds-fpjzfrfwj twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: How Roblox Uses AI to Translate 16 Languages in 100 Milliseconds | daily.dev og:description: Roblox built a single unified transformer-based translation model using Mixture of Experts (MoE) architecture to handle all 256 language direction pairs across... og:url: https://daily.dev/posts/how-roblox-uses-ai-to-translate-16-languages-in-100-milliseconds-fpjzfrfwj og:image: https://api.daily.dev/og/posts/FpjZFrfWJ.png og:image:alt: How Roblox Uses AI to Translate 16 Languages in 100 Milliseconds 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. # How Roblox Uses AI to Translate 16 Languages in 100 Milliseconds **[ByteByteGo](https://daily.dev/sources/bytebytego)** · 10 min read · 2 upvotes · 1 comments ## Summary Roblox built a single unified transformer-based translation model using Mixture of Experts (MoE) architecture to handle all 256 language direction pairs across 16 languages, replacing the need for 256 separate models. To meet a 100ms latency ceiling at 5,000+ chats per second, they applied knowledge distillation to compress the model from ~1B to under 650M parameters, combined with quantization and model compilation. The serving pipeline includes a translation cache, dynamic batching, and an embedding cache that avoids re-encoding the same source message for multiple target languages. For quality measurement, they built a reference-free quality estimation model that scores translations at word-level granularity without needing human reference translations. Low-resource language pairs were improved via iterative back-translation, and domain-specific slang was handled through human-labeled platform terminology. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community discussion Top comments from developers on daily.dev. **@bobbyiliev** · 0 upvotes > great read! ## Similar posts on daily.dev - [Roblox launches real-time AI chat rephrasing to filter out banned language](https://daily.dev/posts/roblox-launches-real-time-ai-chat-rephrasing-to-filter-out-banned-language-3qc53qahm) · TechCrunch · 1 upvotes · 0 comments - [Omnilingual MT: Machine Translation for 1,600 Languages](https://daily.dev/posts/omnilingual-mt-machine-translation-for-1-600-languages-7novngh69) · Hacker News · 1 upvotes · 0 comments - [Medium](https://daily.dev/posts/medium-vrsqfgio1) · Medium · 1 upvotes · 0 comments - [Inside Roblox’s Bet on World Models](https://daily.dev/posts/inside-roblox-s-bet-on-world-models-mfuhvkw5c) · ByteByteGo · 1 upvotes · 0 comments --- [View this post on daily.dev](https://daily.dev/posts/how-roblox-uses-ai-to-translate-16-languages-in-100-milliseconds-fpjzfrfwj) ```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":"How Roblox Uses AI to Translate 16 Languages in 100 Milliseconds","url":"https://daily.dev/posts/how-roblox-uses-ai-to-translate-16-languages-in-100-milliseconds-fpjzfrfwj","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/how-roblox-uses-ai-to-translate-16-languages-in-100-milliseconds-fpjzfrfwj"},"datePublished":"2026-03-30T15:36:23.758Z","dateModified":"2026-03-30T15:36:55.959Z","description":"Roblox built a single unified transformer-based translation model using Mixture of Experts (MoE) architecture to handle all 256 language direction pairs across...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/97c6abd0cfafa5aac9b407d1d56866bd?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/97c6abd0cfafa5aac9b407d1d56866bd?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"ByteByteGo","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"ByteByteGo","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/35be29234ee14d01a9cd049c52e12753","url":"https://daily.dev/sources/bytebytego"},"commentCount":1,"discussionUrl":"https://daily.dev/posts/how-roblox-uses-ai-to-translate-16-languages-in-100-milliseconds-fpjzfrfwj","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":1}],"keywords":"","timeRequired":"PT10M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"ByteByteGo","item":"https://daily.dev/sources/bytebytego"},{"@type":"ListItem","position":3,"name":"How Roblox Uses AI to Translate 16 Languages in 100 Milliseconds"}]} {"@context":"https://schema.org","@type":"WebPage","@id":"https://daily.dev/posts/how-roblox-uses-ai-to-translate-16-languages-in-100-milliseconds-fpjzfrfwj","comment":[{"@type":"Comment","text":"great read!","datePublished":"2026-03-31T08:09:06.024Z","url":"https://daily.dev/posts/FpjZFrfWJ#c-2eAT8ffws","author":{"@type":"Person","name":"Bobby Iliev","url":"https://daily.dev/bobbyiliev","image":"https://avatars3.githubusercontent.com/u/21223421?v=4"}}]} ```