Russian

How to get natural Russian out of Syntic models, and what to check before you ship. The general rules for every language are on Work in other languages.

At a glance

Register and form of address

Вы (capitalised in direct correspondence) is the polite form for customers; ты is for casual apps. Choose and keep it.

Numbers, dates and currency

Decimal comma, space for thousands (1 234,50 ₽). Dates: 5 ноября 2026 г. or 05.11.2026. Quotation marks «ёлочки».

Common pitfalls

• Case endings change nouns after numbers (1 товар, 2 товара, 5 товаров). Template strings that insert numbers need the model or your code to inflect correctly.
• Ё vs Е: decide whether to write ё consistently; it affects search matching.
• Gendered past tense for the user (вы сделали is safe; ты сделал/сделала is not).

A system prompt line that works

Writing the language instruction in Russian itself is a strong signal:

Отвечай на русском языке, обращайся к пользователю на «Вы», кратко и вежливо.

(Answer in Russian, addressing the user as Вы, briefly and politely.)

Keep the rest of your instructions in whichever language your team maintains best; the model follows mixed-language system prompts reliably, and the reply language follows this line.

Test before launch

1. Collect 30 or more real Russian messages, including short, misspelt and mixed-language ones.
2. Have a fluent speaker grade replies for correctness, register and naturalness; then calibrate a rubric grader on their grades (Evaluate).
3. Check rendering in your actual UI: line breaks, truncation and fonts.
4. Re-run the set whenever you change the prompt or the model.