State the reply language directly
Begin with a plain instruction such as 'Please reply in Spanish and keep the narration in Spanish as well.' If you want a bilingual scene, explain when each language should be used: spoken dialogue can be in one language while narration stays in another.
Keep character names and important place names consistent. Translating a name differently in every message can make a single place or person look like several different subjects.
Match the model and the character definition
Our model choices have different multilingual strengths. Check the models available to your plan and test a normal exchange in the language you want. A short test can reveal awkward phrasing before you commit to a long scene.
An English-only definition with many fixed English phrases may keep pulling a character back into English. Adjust those examples when you own the character, or choose a character whose description already fits your preferred language.
Correct drift with a small, specific instruction
If the conversation changes language unexpectedly, restate the requested language and continue from the latest event. You usually do not need to repeat the entire plot to correct a language choice.
Generated translations can still make mistakes, especially with dialect, technical vocabulary, or ambiguous names. Do not treat a roleplay response as a certified translation or as authoritative legal, medical, or financial wording.
Questions
Can I chat in Spanish, German, Arabic, Japanese, or another language?
You can request a reply language and choose an available model that supports it. Quality and consistency vary by model and character instructions; changing an interface label alone is not a guarantee.
Why does a character switch back to English?
Its greeting, definition, example dialogue, or recent context may favor English. Restate the desired language and review those instructions where you can edit them.