Yi-1.5 is an upgraded version of Yi. It is continuously pre-trained on Yi with a high-quality corpus of 500B tokens and fine-tuned on 3M diverse fine-tuning samples.

Compared with Yi, Yi-1.5 delivers stronger performance in coding, math, reasoning, and instruction-following capability, while still maintaining excellent capabilities in language understanding, commonsense reasoning, and reading comprehension.

Model	Context Length	Pre-trained Tokens
Yi-1.5	4K, 16K, 32K	3.6T

Models

Chat models

Name	Download
Yi-1.5-34B-Chat	• 🤗 Hugging Face • 🤖 ModelScope • 🟣 wisemodel
Yi-1.5-34B-Chat-16K	• 🤗 Hugging Face • 🤖 ModelScope • 🟣 wisemodel
Yi-1.5-9B-Chat	• 🤗 Hugging Face • 🤖 ModelScope • 🟣 wisemodel
Yi-1.5-9B-Chat-16K	• 🤗 Hugging Face • 🤖 ModelScope • 🟣 wisemodel
Yi-1.5-6B-Chat	• 🤗 Hugging Face • 🤖 ModelScope • 🟣 wisemodel

Base models

Name	Download
Yi-1.5-34B	• 🤗 Hugging Face • 🤖 ModelScope • 🟣 wisemodel
Yi-1.5-34B-32K	• 🤗 Hugging Face • 🤖 ModelScope • 🟣 wisemodel
Yi-1.5-9B	• 🤗 Hugging Face • 🤖 ModelScope • 🟣 wisemodel
Yi-1.5-9B-32K	• 🤗 Hugging Face • 🤖 ModelScope • 🟣 wisemodel
Yi-1.5-6B	• 🤗 Hugging Face • 🤖 ModelScope • 🟣 wisemodel

Benchmarks

Chat models

Yi-1.5-34B-Chat is on par with or excels beyond larger models in most benchmarks.

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Yi-1.5-9B-Chat is the top performer among similarly sized open-source models.

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Base models

Yi-1.5-34B is on par with or excels beyond larger models in some benchmarks.

image/png

Yi-1.5-9B is the top performer among similarly sized open-source models.

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Quick Start

For getting up and running with Yi-1.5 models quickly, see README.

01-ai/Yi-1.5-9B-Chat

Intro

Models

Benchmarks

Quick Start

01-ai/
Yi-1.5-9B-Chat