Yi
by 01.AI
At a glance
Open-weight bilingual (English and Chinese) large language model family from 01.AI.
open-weights llm bilingual
- Licence
- Apache-2.0
- Category
- Open Models
- Business model
- Open (open weights/source)
- Availability
- Global
- Launched
- 2023-11
Overview
Yi is a family of open-weight large language models from 01.AI, trained for strong bilingual performance in English and Chinese. The series spans multiple sizes, including base and chat-tuned variants, with weights released under the Apache-2.0 license. Yi models can be downloaded and self-hosted for free, making them a common choice for bilingual applications.
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Key features
- Open-weight LLMs in multiple parameter sizes
- Strong bilingual English and Chinese performance
- Base and chat-tuned variants for different uses
- Apache-2.0 license permitting commercial use
Use cases
- Self-hosting a bilingual chat or writing assistant
- Fine-tuning on domain data for Chinese-English products
- Research on open large language models
Pricing
Yi model weights are free to download and use under Apache-2.0; costs come only from the compute used to run or fine-tune them.
Record details
Provenance, dates and links are kept here so the main sections stay about the product itself.
Links, dates and provenance
- Record updated
- 2026-09-10
- Model family
- Yi
- Founded
- 2023
- Headquarters
- CN
- Canonical URL
- https://globalaiproductindex.com/products/yi/
Selection profile
Every field says where its value comes from. "Unknown" means we have not confirmed it — it does not mean the product lacks the feature.
Selection profile11 fields3 unknown
- Tasks it fits
- Running models yourself
Derived from the record: category "open-models".
Suggest a correction - How you use it
- Model weights
Derived from record tag matching /^open-weights$/.
Suggest a correction - Runs on
- Not recorded
No platform support is stated in the record.
Suggest a correction - Where it runs
- Local machine
Open-weight models are run by the user, not served by the vendor.
Suggest a correction - Works offline
- Partly
Local execution implies the model can run without a network once downloaded, but the vendor does not state this in the record.
Suggest a correction - Official service region
- Global
Mirrors the availability field already on the record ("global").
Suggest a correction - Public API
- Not recorded
The record does not state whether a public API exists.
Suggest a correction - Licence
- Apache-2.0
Mirrors the licence already recorded on the product record; not re-verified against the licence text by this migration.
Suggest a correction - Commercial use
- Permitted
Recorded licence allows commercial use (copyleft obligations may still apply).
Suggest a correction - Interface languages
- Not recorded
No vendor page read in this pass states the product's own interface languages; the key exists so the field can be answered later rather than left absent.
Suggest a correction - Billing
- Open source Free Free allowance: Yes Subscription required: No
Prices are the vendor’s advertised entry price and exclude taxes; always confirm on the vendor’s own page.
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Where each value comes from
- Tasks it fits
- Our inference
- How you use it
- Our inference
- Runs on
- Our inference
- Where it runs
- Our inference
- Works offline
- Our inference
- Official service region
- Our inference
- Public API
- Our inference
- Licence
- Our inference
- Commercial use
- Our inference
- Interface languages
- Unknown
Frequently asked questions
Is Yi free to use?
Yes. Yi weights are released under Apache-2.0, which permits free commercial use and modification.
What languages does Yi target?
Yi is trained for bilingual performance, with a focus on English and Chinese.
Who develops Yi?
Yi is developed by 01.AI, the Chinese AI company founded by Kai-Fu Lee in 2023.
What does Yi not record?
No public documentation or pricing page is recorded for Yi, because neither was in the vendor fetch scope, so no plan price is established.
Similar products
- Baichuan — Open-weight bilingual LLM family from Beijing-based Baichuan Intelligence, now focused on medical AI with its Baichuan-M reasoning models.
- DeepSeek — Open-weight LLM family and chat assistant from Hangzhou-based DeepSeek, known for strong reasoning models.
- GLM — Family of open-weight large language models from Zhipu AI, spanning general, reasoning, and coding-focused variants.
- Llama — Open-weight large language model family from Meta, spanning Llama 3 and Llama 4 generations across multiple sizes.
- Mistral — Family of open-weight large language models from Mistral AI, including the Mistral and Mixtral series.
- Qwen — Family of open-weight large language models developed by Alibaba, spanning text, vision, and coding tasks, including the Qwen3.5 and Qwen3.8-Max lines.
Related guides
Sources
This record was last reviewed on 2026-09-10.
Machine-readable record: /api/products/yi.json · Spot an error? Suggest a correction