Language model

ERNIE 4.5 21B A3B

Baidu

Released: June 30, 2025
Data date: October 28, 2026

Benchmark-Meta-Score: Unavailable
No independent results
Input: Text
Output: Text

ERNIE 4.5 21B A3B is a Baidu text model with a mixture-of-experts architecture. It activates 3 billion of its 21 billion total parameters per processing step. The model takes text input, generates text, and supports tool calls.

Specifications and access

Specification	Value and source
Weights	Open weightsSource
Access	APISource
Parameters	21 billionSource
Active parameters	3 billionSource
Context window	131,072 tokensSource
License	Apache 2.0Source
Inputs	TextSource
Outputs	TextSource
Tool calling	YesSource

Sources and data date

Type	Evidence and data date
Input	Documented modalities. Retrieved October 27, 2026. Source: models.dev catalog · models.dev catalog (retrieved October 27, 2026) · models.dev model catalog · Editorial description reviewed October 29, 2026
Output	Documented modalities. Retrieved October 27, 2026. Source: models.dev catalog · models.dev catalog (retrieved October 27, 2026) · models.dev model catalog · Editorial description reviewed October 29, 2026
Research status	Research date October 28, 2026. 1 source URLs checked. This documents the inspected sources, not an exhaustive inventory of every publication.
Not published	Maximum output Note The exact PT checkpoint card/config and Baidu release material confirm the model and 131072 context, but do not publish an independent output ceiling. Sample generation lengths are not caps.
Additional source	Hugging Face (retrieved October 28, 2026) · ERNIE 4.5 21B A3B model card · Editorial description reviewed October 29, 2026
Additional source	OpenRouter: Popularity index (derived), CC BY 4.0
Additional source	Vercel AI Gateway: Popularity index (derived), CC BY 4.0
Additional source	Ollama: cumulative downloads for the popularity index
Additional source	Replicate: cumulative runs for the popularity index
Additional source	Google Trending Now: limited feed selection for Germany and the US
Additional source	Creative Commons Attribution 4.0