Checklist VsOSh AI 2026 School Stage (Sirius platform, region group 4), grades 9–11 · Task 1
Chatbot Context Window
Russian title: Задание 1
Compute the largest document, in pages, that fits a chatbot's context budget together with history, reasoning and answer.
The task
A chatbot can process at most 128,000 text units at once (one word = one unit). The conversation history holds 500 words; each document page has exactly 400 words; the answer is as long as the document and the intermediate reasoning is 15% of the document length.
What is the largest document, in pages, for which history + document + reasoning + answer does not exceed 128,000 units?
Abridged and translated by SOTA from the official Russian materials. The official statement has the exact rules, and it wins wherever this summary differs.
In English
This task was published in Russian. SOTA translated its 3 files into English on 16 September 2026.
- Task statement Russian original of Task statement
- Official solution Russian original of Official solution
- Full paper with solutions (all tasks of the tour) Russian original of Full paper with solutions (all tasks of the tour)
Read the task statement in English
Chatbot Context Window
English translation by SOTA – AI Community of the Russian original. Organisers who would like this translation removed can email [email protected].
Task 1 of the school stage of the All-Russian School Olympiad (VsOSh) 2025/26 in artificial intelligence (region group IV), grades 9–11. The official answer and solution are in a separate file.
A chatbot — a program that reads text and writes answers — can process at most 128000 conventional units of text at a time. Assume that one word is one conventional unit. An ongoing conversation already stores a history of 500 words. You want to upload a document in which every page contains exactly 400 words. The system's answer must be equal in length to the source text; the intermediate reasoning amounts to 15% of the length of the source text. What is the largest document that can be processed so that the total number of conventional units (history + source text + reasoning + answer) does not exceed 128000? Give the answer in pages.
Scoring criterion: exact match of the answer — 12 points
Maximum score for the task — 12
Translated by SOTA. The Russian original is the official version and wins wherever the two differ. Statement and official solution come from one PDF, the analysis of the school-stage tasks for region group IV, grades 9–11, linked from the olympiad's Sirius page. If you organise this olympiad and would like the translation removed, email [email protected] and we will take it down.
At a glance
- You get
- Statement only.
- You submit
- One number (pages).
- Scoring
- Exact answer; 12 points.
- Format
- School stage on the Sirius.Courses platform, region group 4, 21 October 2025; grades 9–11; individual; 150 minutes; maximum 112 points for the paper (tasks 1–6: 12 points each; tasks 7–8: 20 points each).