OpenAI

GPT-OSS 120B

OpenAI's large open model

Text

Reasoning

Tools

Type: Chat
Context: 131K tokens
Russian: medium
Input price: 2,96 ₽ / 1M tokens
Output price: 13,6 ₽ / 1M tokens
Release date: August 2025

chat/completions

import OpenAI from "openai"
const client = new OpenAI({
  baseURL: "https://api.yenisei.ru/v1",
  apiKey: process.env.YENISEI_API_KEY,
})
const stream = await client.chat.completions.create({
  model: "gpt-oss-120b",
  messages: [{ role: "user", content: "Hi!" }],
  stream: true,
})
for await (const chunk of stream) {
  process.stdout.write(chunk.choices[0]?.delta?.content ?? "")
}

About the model

GPT-OSS 120B is the flagship model of OpenAI's open lineup, with 120B parameters and strong reasoning and coding abilities. The model lays out step-by-step reasoning on complex tasks and confidently designs, debugs and explains code. The weights are open: you can run the model yourself. It supports adjustable reasoning depth and tool calling, making it a good fit for agents and automation. It is multilingual and accurate in Russian.