{"slug": "do-ai-coding-agents-search-the-web-in-your-language-i-tested-claude-code-and-in", "title": "Do AI coding agents search the web in your language? I tested Claude Code and Codex in 5 languages", "summary": "A developer ran 320 web-search sessions with Claude Code (Opus 5.5) and Codex CLI across five languages to measure whether AI coding agents search in the user's language. For local topics, Claude Code searched in the local language 82% of the time when asked in that language versus 50% for Codex, and 49% versus 17% when asked in English; for global topics, English-language sources dominated. The full dataset of queries, cited URLs and page languages is released as CSV/JSON under CC BY 4.0.", "body_md": "When you ask an AI agent something in Korean or Spanish, does it search in that language? I ran 320 web-search sessions with Claude Code (Opus 5.5) and Codex CLI to find out.\n\n**Global topic (AI products), asked in Korean, Japanese, Spanish or Ukrainian:**\n\n**Local topic (metro fare, this week's news, restaurants in Seoul, Tokyo, Madrid, Kyiv), 5 runs per question:**\n\n|  | Claude Code | Codex | \n|---|---|---|\n| Asked in the local language: searches in that language | 82% | 50% | \n| Asked in English: searches in the local language | 49% | 17% | \n\n**Why it matters:** if you publish in a language other than English, AI agents may only find you for local topics. For global topics, the English web wins.\n\nEvery query, cited URL and the language of each cited page are in the dataset (CSV/JSON, CC BY 4.0): [https://tokensave.app/data/claude-web-search-by-language](https://tokensave.app/data/claude-web-search-by-language)", "url": "https://wpnews.pro/news/do-ai-coding-agents-search-the-web-in-your-language-i-tested-claude-code-and-in", "canonical_source": "https://dev.to/jaehyun_cho_0dff271e0d2e5/do-ai-coding-agents-search-the-web-in-your-language-i-tested-claude-code-and-codex-in-5-languages-bho", "published_at": "2026-10-19 02:31:24+00:00", "updated_at": "2026-10-19 02:49:05.436559+00:00", "lang": "en", "topics": ["ai-agents", "ai-search", "ai-tools", "large-language-models"], "entities": ["Claude Code", "Codex CLI", "OpenAI", "Anthropic", "Opus 5.5", "tokensave.app"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/do-ai-coding-agents-search-the-web-in-your-language-i-tested-claude-code-and-in", "markdown": "https://wpnews.pro/news/do-ai-coding-agents-search-the-web-in-your-language-i-tested-claude-code-and-in.md", "text": "https://wpnews.pro/news/do-ai-coding-agents-search-the-web-in-your-language-i-tested-claude-code-and-in.txt", "jsonld": "https://wpnews.pro/news/do-ai-coding-agents-search-the-web-in-your-language-i-tested-claude-code-and-in.jsonld"}}