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Yi Large

Custom
Text & Chat

01.AI's larger general-purpose chat model with 32k context window and strong bilingual performance.

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TL;DRΒ·Last updated May 16, 2026

Yi Large is text & chat AI model from Custom, priced at €3.00 per 1M input tokens with a 32.8K tokens context window.

Try Yi Large

0.7

Direct API access coming soon

Pricing

Price per Generation
Per generationFree

API Integration

Use our OpenAI-compatible API to integrate Yi Large into your application.

Install
npm install railwail
JavaScript / TypeScript
import railwail from "railwail";

const rw = railwail("YOUR_API_KEY");

// Simple β€” just pass a string
const reply = await rw.run("yi-large", "Hello! What can you do?");
console.log(reply);

// With message history
const reply2 = await rw.run("yi-large", [
  { role: "system", content: "You are a helpful assistant." },
  { role: "user", content: "Explain quantum computing simply." },
]);
console.log(reply2);

// Full response with usage info
const res = await rw.chat("yi-large", [
  { role: "user", content: "Hello!" },
], { temperature: 0.7, max_tokens: 500 });
console.log(res.choices[0].message.content);
console.log(res.usage);
Specifications
Context window
32,768 tokens
Max output
4,096 tokens
Developer
Custom
Category
Text & Chat
Supported Formats
text
Tags
01ai
chinese
bilingual

Deep dive β€” 01.AI (Lingyi Wanwu)'s Yi Large

About 01.AI (Lingyi Wanwu)
Founded 2023 Β· Beijing, China

01.AI (離一万物, Lingyi Wanwu) was founded in March 2023 by Kai-Fu Lee β€” former president of Google China, founder of Sinovation Ventures and a globally recognised AI investor and author. The lab launched the Yi-6B and Yi-34B open-weights base models in November 2023, which briefly led the Hugging Face Open LLM Leaderboard. 01.AI followed with Yi-9B (2024), Yi-VL (vision, 2024) and the closed-API flagship Yi Large in May 2024. The company raised $200M+ in seed funding in 2023 at a reported $1B valuation, with investors including Alibaba Cloud, Sinovation Ventures and others. 01.AI's positioning emphasises strong bilingual Chinese-English performance, data-quality-focused training and pragmatic product applications.

Visit 01.AI (Lingyi Wanwu) β†’
Architecture
Decoder-only Transformer (proprietary)

Yi Large is a dense decoder-only transformer following the modern LLM recipe β€” grouped-query attention, RoPE positional embeddings, SwiGLU activations and RMSNorm. 01.AI has been less specific about Yi Large's exact size than about the open Yi-34B/9B/6B variants. The Yi technical report describes the training methodology in detail: a heavily filtered bilingual Chinese-English data pipeline using CCNet-style quality filtering, aggressive deduplication and curated additions of books, code and scientific content. The Yi-34B base was trained on 3.1T tokens; Yi Large is reported to scale further. Post-training is supervised fine-tuning plus RLHF with proprietary specifics. Yi Large is closed-API only β€” only the smaller Yi base and chat variants (Yi-34B, Yi-9B, Yi-6B) have open weights under the Yi Series Models Community License Agreement. Released May 2024 via 01.AI Platform and partner clouds.

Parameters
Undisclosed (estimated ~100B based on tier sibling Yi-34B and contemporaneous public details)
Context
32K tokens
What it can do
  • Top-tier bilingual Chinese-English performance
  • Frequent #1 or #2 ranking on SuperCLUE Chinese leaderboards
  • Top-10 LMSYS Chatbot Arena ranking at release in 2024
  • Strong Chinese reasoning, math, writing and exam-style tasks
  • Claimed parity with GPT-4 on selected English benchmarks at release
  • 32K context window
  • Available via 01.AI Platform and hosted API
  • Best for: Chinese-market applications, bilingual content workflows, Chinese exam and education AI.
Training & License

Trained on heavily filtered bilingual Chinese-English web data, books, code and academic content. Smaller Yi-34B base used 3.1T tokens; Yi Large is reported to scale further. Data pipeline uses CCNet-style quality filtering plus aggressive deduplication (described in the Yi technical report). Knowledge cutoff approximately early 2024. Post-training is supervised fine-tuning plus RLHF.

License: Yi Large itself is closed-API only under 01.AI's commercial terms of service. The open Yi base / chat variants (Yi-34B, Yi-9B, Yi-6B) use the Yi Series Models Community License Agreement, which permits commercial use after free registration with 01.AI.

Known limitations
  • Closed weights β€” Yi Large itself is API-only
  • 32K context lags 128K+ frontier models
  • No vision modality (separate Yi-VL line covers multimodal)
  • Tool-use / function-calling polish behind GPT-4 / Claude / Command R+
  • Filters politically sensitive Chinese topics consistent with regulations
  • Update cadence less transparent than US labs

Research papers

Frequently asked questions

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