What Languages are Supported by Claude? [2023]

As an AI assistant designed to be helpful, harmless, and honest for all, Claude aims to support conversations in as many languages as possible. In this article, we will look at Claude’s language capabilities – the languages it currently supports, how it handles multiple languages, plans for expanding language coverage, and the challenges involved.

Currently Supported Languages

Currently Supported Languages


  • English was the first language Claude supported and remains the primary language today
  • Claude has the most conversational depth and topical coverage in English
  • Its training corpus and knowledge base had a predominant focus on English


  • Spanish was the first non-English language added given its global significance
  • Claude can conduct fluent Spanish conversations with good topical coverage
  • Spanish expansion focused on training the model on native datasets


  • French support was added both due to global importance and Claude’s own French name origin
  • As a Romance language, some vocabulary overlap with Spanish helped expedite French development
  • Focus areas for French training included idioms, grammatical rules, and word gender

Upcoming Language Additions

Upcoming Language Additions


  • Support for German conversations is slated to arrive next given Germany’s economic position and native speakers
  • Difficulties include grammatical gender, long compound words, and unique syntax
  • Training will leverage German books, news sources, and web data


  • Italian is planned to follow soon after German due to linguistic similarity to Spanish and French
  • Overlapping Latin roots and shared vocabulary will assist with Italian development
  • Priority will be given to common Italian idioms, expressions, and conjugations


  • Addition of Portuguese will help serve large global populations including in Brazil
  • Shared roots with Spanish will enable transfer learning to speed up training
  • Focus will be on differences like pronunciation, slang, word variations from Spanish and idiosyncrasies

Approach to Handling Multiple Languages

Approach to Handling Multiple Languages

Separate Models

Multilingual Model

  • Current approach is a single model handling multiple languages together
  • Enables sharing parameters for common capabilities while handling uniqueness
  • Adds complexity but is more scalable and efficient as language support expands


  • Claude auto-detects language from first few user inputs before responding
  • This allows seamlessly switching languages within or across conversations
  • Detection based on vocabulary, grammar, syntax patterns

Transfer Learning

  • Claude leverages transfer learning to efficiently add new languages
  • Existing model knowledge is transferred and fine-tuned on new language data
  • Allows building on capabilities versus starting from scratch

Challenges in Expanding Languages

Challenges in Expanding Languages

Grammar and Syntax

  • Each language has diverse grammatical constructs and syntax forms to master
  • Training data must cover language rules as well as exceptions
  • More complex in languages like German with extensive grammar


  • Claude’s knowledge and responses must be adapted for local relevance
  • Requires input data attuned to events, entities, and concerns in each region
  • Critical for navigating culture-specific topics and conversations

Speech Patterns

  • Capturing informal verbal speech like slang, idioms, etc. poses challenges
  • Usually harder to find textual training data for spoken language
  • May require audio transcripts along with traditional text data

Testing Coverage

  • Thorough testing is essential to ensure high quality across languages
  • Testing conversational depth on wide-ranging topics
  • Testing on diverse use cases and interaction modes

Crowdsourced Feedback

  • Claude uses crowdsourced feedback to improve language support
  • Native speakers are engaged to evaluate conversational quality
  • Feedback helps identify gaps in local idioms, slang, pronunciations etc.
  • Enables continuous improvement of language models beyond just training data

Regional Content Creation

  • Claude aims to generate more regional content over time
  • Creating region-specific content like jokes, anecdotes, fun facts
  • Content tailored to connect better with users from different cultures
  • Starts with English but will expand to other languages

Voice Recognition

Voice Recognition
  • Along with text, Claude also handles voice input in supported languages
  • Language models trained on transcribed speech data
  • Uses speech-to-text software optimized for regional accents
  • Allows voice conversations in a natural manner


  • Claude can respond verbally in natural voices for each language
  • Text-to-speech software converts Claude’s text response
  • Voices customized for dialects of each language
  • Enable voice-based conversational experience

Local Partnerships

  • Claude partners with local entities to improve language support
  • Academics, linguists, authors provide expertise
  • Media groups provide content and testing capabilities
  • Telecom companies provide speech data and compute infrastructure

Research Collaboration

  • Anthropic collaborates with AI researchers on multilingual models
  • Sharing datasets, model architectures, best practices
  • Joint papers published to advance scientific research
  • Goal to pioneer conversational AI across languages


Claude’s language support remains a work in progress as it expands beyond English to serve global users. Training multilingual models using transfer learning and robust testing will enable adding new languages efficiently. The end goal is facilitating seamless conversations in users’ native languages as Claude fulfills its purpose of being helpful, harmless, and honest for all linguistic communities.


Q: What was the first language supported by Claude?

A: English was the first language supported by Claude and remains its primary language today.

Q: What additional languages does Claude currently support?

A: Beyond English, Claude currently supports conversations in Spanish and French.

Q: How does Claude handle multiple languages simultaneously?

A: Claude uses a multilingual model trained on data from all supported languages rather than separate models. It auto-detects the input language.

Q: Which languages are planned to be added next?

A: The upcoming language additions planned are German, Italian, and Portuguese based on global demand.

Q: Does Claude use transfer learning when adding new languages?

A: Yes, transfer learning is used to transfer existing model knowledge and fine-tune it on new language data efficiently.

Q: What are some key challenges in expanding language coverage?

A: Key challenges are handling diverse grammar rules, localization, capturing informal speech, and testing conversational depth in each language.

Q: How does Claude improve language support beyond just training data?

A: Claude uses crowdsourced feedback from native speakers to continuously enhance language models beyond training data.

Q: Can Claude handle voice conversations in multiple languages?

A: Yes, Claude supports voice input and text-to-speech output in native voices for natural conversations.

Q: Does Claude create region-specific content for different languages?

A: Claude aims to create more regionalized content over time, starting with English and expanding to other languages.

Q: Who does Anthropic collaborate with on multilingual models?

A: Anthropic collaborates with AI researchers globally on techniques for multilingual conversational models.

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