Skip to content
Not available in this workspace
OpenRouterOpenRouter
© 2026 OpenRouter, Inc

Product

  • Chat
  • Rankings
  • Benchmarks
  • Apps
  • Discover
  • Models
  • Collections
  • Providers
  • Pricing
  • Enterprise
  • Labs

Company

  • About
  • Blog
  • Careers
    Hiring
  • Privacy
  • Terms of Service
  • Support
  • Works With OR
  • Data

Developer

  • Documentation
  • API Reference
  • Developer Platform
  • Status

Connect

  • Discord
  • GitHub
  • LinkedIn
  • X
  • YouTube
Favicon for baidu

Baidu: ERNIE 4.5 21B A3B Thinking

baidu/ernie-4.5-21b-a3b-thinking

Model weights

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.

Modalities

Context

131K

Released

Oct 9, 2025

Knowledge Cutoff

Mar 2025

About Baidu: ERNIE 4.5 21B A3B Thinking

OpenRouter makes Baidu: ERNIE 4.5 21B A3B Thinking available through a unified, OpenAI-compatible API using the model ID baidu/ernie-4.5-21b-a3b-thinking.

Baidu: ERNIE 4.5 21B A3B Thinking accepts text and returns text. It has a 131,072-token context window.

It was released on October 9, 2025; its knowledge cutoff is March 31, 2025.

More models from Baidu

  • ERNIE 4.5 VL 424B A47B

Frequently asked questions

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.

ERNIE 4.5 21B A3B Thinking has a 131,072 token context window.

ERNIE 4.5 VL 424B A47B is another text model from Baidu.

ERNIE 4.5 21B A3B Thinking was released on October 9, 2025. Its knowledge cutoff is March 31, 2025.

ActivityFAQ

Activity

Token volume and request traffic to this model over time.