Yi-1.5

01.AI · 2024 · LLM · China

A to Z

A · App: No
B · Built By: 01.AI
C · CEO & Politics: Kai-Fu Lee — Centrist / bridges US-China tech
D · Date: 2024
E · Expertise: Intermediate+
F · Free Tier: Yes
G · Generates: Text only
H · Deployment: Local (open weights)
I · Inputs: Text
J · Jurisdiction: China
K · Key Staffers: Kai-Fu Lee (CEO/Founder)
L · Languages: Chinese-primary
M · Model Type: LLM
N · Safety Issues: None reported
O · Open Source: Yes — open weights
P · Pricing: Free (open weights, Apache 2.0)
Q · AIDb Rating: 5/10 · AIDb v2.0 (rule-based): Capability 4/10 · Currency 4/10 · Access 8/10 · Significance 4.5/10 → 4.67
R · What Makes It Special: 01.AI's Yi-1.5, an upgraded Yi series open-sourced on May 13, 2024 in 6B, 9B and 34B sizes (base and chat, with 4K, 16K and 32K context versions), continually pretrained on Yi with 500B more high-quality tokens (3.6T in total) and fine-tuned on 3M samples; 01.AI reports stronger coding, math, reasoning and instruction following than Yi while keeping its language understanding, commonsense reasoning and reading comprehension. Apache 2.0.
S · Stock / Status: Private ($1B+ valuation, Nov 2023; Hong Kong IPO planned for 2027)
T · Training Cutoff: [UNKNOWN]
U · Users: [UNKNOWN]
V · Voice Chat: No
W · Weights: Downloadable
X · X Handle: @01ai_yi
Y · Year Founded: [UNKNOWN]
Z · Bottom Line: Open-weights LLM from 01.AI, released 2024.

Data completeness 88% · Last verified 2026-06-11 · Primary source ↗

“Yi-1.5.” AIDb — The AI Database. Verified 2026-06-11. https://theaidatabase.com/m/01-ai-yi-1-5.html