On August 11, 2026, Yandex launched the 'About Characters' feature in the Yandex Books service: the AI companion Lyumen analyzes reading or listening progress and tells the user only about the characters and events they have already encountered, without revealing spoilers.
What happened
The feature is available for most e-books and audiobooks with characters in mobile apps on Android and iOS. The package also includes additional features 'Earlier in the book' and personalized book recommendations. Each subscriber receives a unique AI companion in the form of an animal.
Context
Previously, in June 2026, Lyumen appeared in Yandex Music, where it translates textual descriptions of the user's mood into prompts for the 'My Wave' recommendation algorithm. The full launch of Lyumens across all of Yandex's entertainment services is planned for the end of 2026. Technically, the feature relies on a RAG-like approach with contextual filtering: the model receives information limited to the user's progress, which allows it to generate answers without spoilers.
Why this matters for the industry
Yandex is betting on emotionally oriented AI companions instead of traditional search assistants — this is a strategic shift from transactional interaction to a conversational interface integrated directly into content consumption. The concept of animal characters as habit anchors for audience retention echoes the approaches of Replika and Character.AI, but is adapted for ecosystem integration. For startups in Russia, this is a signal: the AI companion market is confirmed by a major player, however, Yandex's ecosystem integration creates a high barrier for independent solutions.
Why this matters for users
The feature solves the practical problem of forgetting characters after a break in reading books with a large number of characters. The user receives a reference about the characters without the risk of spoilers, which replaces manually returning to previous chapters or searching on external resources. The feature is available to Yandex Books subscribers on Android and iOS.
What is still unknown / limitations
Technical details of the RAG system architecture, including the methodology for ensuring the 'no spoilers' guarantee and quality control mechanisms for generation, have not been disclosed. The cost of inference when scaling to millions of subscribers and the quality of the system's work with books containing a complex non-linear structure of characters remain unknown.
Sources
- Yandex — AI companion Lyumen in Yandex Books
- Comss — Yandex Books received the AI feature 'About Characters'
- GPTML — Lyumens from Yandex: how they work, when to expect them
Author
Look at AI, editorial team