GigaChat is Sber's family of large language models, and one of the few flagship networks built with Russian as its first training priority rather than adapted to it after the fact. For Russian-market projects, that difference shows up in tone, phrasing and terminology.
What it is
GigaChat is developed by Sber. Its consumer service is giga.chat, and developers reach the models through the API at developers.sber.ru — an OpenAI-compatible interface with function calling and embeddings, offered as the GigaChat 2 line (Lite, Pro, Max) on Sber's hosting. The mid-2026 flagship generation is GigaChat 3.5 Ultra (July 2026), an open-weight MoE model. Sber's models consistently rank at the top of MERA, the Russian-language benchmark.
What you get
Once the integration ships, GigaChat will give Seyka an alternative engine for work where Russian-language style and local data processing matter most — while the chat, agentic SEO flows and tools stay exactly the same. The open weights and in-Russia hosting also make it relevant for projects that need data handled within the country. It is not a replacement for the current engine, but a wider choice of strengths for different tasks.