Claude's Research Output Varies by Language: Same Prompt, Different Sources

A Reddit user tested Claude across five languages using the same structured research prompt. The models included Claude (exact version unspecified), run in English, Chinese, Russian, Spanish, and Hindi.

Key Findings

• Not a quality difference — the English and non-English outputs were similarly coherent, but the surfaced information differed.
• Claude in Hindi returned sources and developments that never appeared in the English run — same model, same prompt structure, different picture of reality.
• The user notes this suggests the query language shapes what the model considers relevant, potentially biasing research results.

Implications for Developers

If you use Claude (or any LLM) for research, running the same prompt in multiple languages could surface distinct sources and perspectives. This is especially relevant for global topics where non-English sources may be underrepresented in English-only queries.

The test did not include the exact model version, temperature settings, or full prompt text, but the core observation is worth verifying with your own prompts.