Yi-1.5 9B
Bilingual Chinese-English 9B model with strong code and math scores.
About
01.AI open-sourced the Yi-1.5 series on May 13, 2024, upgrading the original Yi models for coding, math, reasoning, and instruction following. The team positioned the 9B as the top performer among similar-size open models at launch, and it remains a genuinely bilingual Chinese-English model with a 200K long-context variant. License note: Yi models ship under 01.AI's custom community license agreement, not a standard OSI license — confirm the commercial terms on the Hugging Face model card before building on it. Honest caveat: the field has moved on; newer small models generally outperform it, so this is a budget and bilingual pick rather than a frontier one.
Specs
Context window
Pricing
Free quota
API access
Weights
Released
Benchmarks
Team-claimed top scores among ~9B open models at launch (May 2024); no pinned numbers verified.
Provider-reported unless a source says otherwise. Benchmarks are marketing-adjacent by nature — treat them as directional.
Use cases
Trust score — 7/10
Scored 7/10 (verified tier, metrics-v1). Evidence: 2024-05-13 open-source date verified via 01.AI GitHub news.; Custom community license (not OSI) honestly disclosed with advice to check HF card.; 200K long-context variant verified; qualitative team claims labeled as claims..