ERNIE-4.5-21B-A3B-Thinking
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A to Z
- A · App
- No
- B · Built By
- Baidu
- C · CEO & Politics
- Robin Li — Chinese establishment; CPPCC National Committee member (documented)
- D · Date
- 2025
- E · Expertise
- Intermediate+
- F · Free Tier
- Yes
- G · Generates
- Text only
- H · Deployment
- Cloud + Local (open weights)
- I · Inputs
- Text
- J · Jurisdiction
- China
- K · Key Staffers
- Haifeng Wang (CTO)
- L · Languages
- Chinese-primary
- M · Model Type
- Reasoning LLM
- N · Safety Issues
- None reported
- O · Open Source
- Yes — open weights
- P · Pricing
- Free (open weights, Apache 2.0)
- Q · AIDb Rating
- 4/10 · AIDb v2.0 (rule-based): Capability 4/10 · Currency 4/10 · Access 5/10 · Significance 4/10 → 4.15
- R · What Makes It Special
- ERNIE-4.5-21B-A3B-Thinking, Baidu's open-weight reasoning version of its lightweight ERNIE-4.5-21B-A3B: a text mixture-of-experts with 21B total and 3B active parameters per token, using 6 of 64 text experts plus 2 shared ones across 28 layers, and a 131,072-token context, post-trained for three more months to deepen its reasoning. Baidu reports much better logical reasoning, math, science and coding, efficient tool use and stronger long-context understanding, under Apache 2.0.
- S · Stock / Status
- $87 (BIDU, Sep 25, 2026)
- T · Training Cutoff
- [UNKNOWN]
- U · Users
- [UNKNOWN]
- V · Voice Chat
- No
- W · Weights
- Downloadable
- X · X Handle
- @Baidu_Inc
- Y · Year Founded
- [UNKNOWN]
- Z · Bottom Line
- Open-weights Reasoning LLM from Baidu, released 2025.
Data completeness 88% · Last verified 2026-06-11 · Primary source ↗
Cite this
“ERNIE-4.5-21B-A3B-Thinking.” AIDb — The AI Database. Verified 2026-06-11. https://theaidatabase.com/m/baidu-ernie-4-5-21b-a3b-thinking.html
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