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,

Creator: Baidu
Lifecycle: Active
Context: 131.1K
Max output: 65.5K
Released: Oct 9, 2025
Status: unknown

Input: $0.07 / 1M tokens
Output: $0.28 / 1M tokens
Cached read: — / 1M tokens
Cached write: — / 1M tokens
Batch discount: —%
Source: OpenRouter
Verified: Apr 5, 2026 (High)

Capabilities

Modalities: text→text
Capabilities: reasoning

Official Links

Intro

https://openrouter.ai/baidu/ernie-4.5-21b-a3b-thinking

Docs

https://openrouter.ai/baidu/ernie-4.5-21b-a3b-thinking

Pricing

https://openrouter.ai/models

Benchmark Coverage

Benchmark	Version	Score	Date	Source	Notes

Release History

Release	Alias	Lifecycle	Release Date	Deprecation	Shutdown	Summary
ERNIE 4.5 21B A3B Thinking	baidu-ernie-4-5-21b-a3b-thinking	Active	Oct 9, 2025	—	—	Model available via OpenRouter.

Host Coverage

Host	Type	Context	Pricing Note	Differences
OpenRouter	aggregator	131.1K	$0.07/1M in · $0.28/1M out via OpenRouter	—

Migration Guidance

Change Events

Date	Type	Title	Description	Source
Oct 9, 2025	family_added	ERNIE 4.5 21B A3B Thinking published	Model made available via OpenRouter.	OpenRouter

Other models from Baidu

ERNIE 4.5 21B A3B, ERNIE 4.5 300B A47B, ERNIE 4.5 VL 28B A3B, ERNIE 4.5 VL 424B A47B