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BaiduOct 9, 2025

Baidu: ERNIE 4.5 21B A3B Thinking

ERNIE-4.5-21B-A3B-Thinking is Baidu's upgraded lightweight MoE model, refined to boost reasoning depth and quality for top-tier performance in logical puzzles, math, science, coding, text generation, and expert-level academic benchmarks.

Context Window
131K
tokens
Max Output
66K
tokens
Released
Oct 9, 2025
Arena Rank
—

Capabilities

👁Vision
🧠Reasoning
🔧Tool Calling
⚡Prompt Caching
🖥Computer Use
🎨Image Generation

Supported Parameters

Frequency Penalty
Reduce repetition
Include Reasoning
Show reasoning tokens
Max Tokens
Output length limit
Presence Penalty
Encourage new topics
Reasoning
Extended thinking
Repetition Penalty
Penalize repeated tokens
Seed
Deterministic outputs
Stop Sequences
Custom stop tokens
Temperature
Controls randomness
Top K
Top-K sampling
Top P
Nucleus sampling

Pricing Comparison

RouterInput / 1MOutput / 1MCached Input / 1M
OpenRouter$0.07$0.28—
Martian$0.07$0.28—

Model IDs

OpenRouterbaidu/ernie-4.5-21b-a3b-thinking
Hugging Facebaidu/ERNIE-4.5-21B-A3B-Thinking ↗

Tags

reasoning
Compare with another model

Compare with…

Baidu: ERNIE 4.5 21B A3BBaidu: ERNIE 4.5 VL 28B A3BQwen: Qwen3 235B A22B Instruct 2507

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