Baidu: ERNIE 4.5 21B A3B
Analysis Summary
ERNIE 4.5 21B A3B is a compact MoE model from Baidu, released August 2025. It supports tool use and function calling with a 131K context window, and its pricing at $0.07 input and $0.28 output per million tokens is low. However, no benchmark data is available for this model, making it impossible to assess its reasoning, coding, or instruction-following quality against the broader field.
Without benchmark evidence, it cannot be recommended for production business workflows where reliability and output quality are measurable requirements. The model may be suitable for experimental use or internal prototyping within teams already familiar with the Baidu ecosystem, but there is no data to support broader adoption claims.
Teams evaluating this model should wait for independent benchmark results before committing to it for client-facing or mission-critical applications.
Assessed June 30, 2026
Editorial notes
Baidu ERNIE 4.5 21B A3B has tool use and function calling at low cost but no benchmark data is available to assess its reasoning or coding capability.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
How Baidu: ERNIE 4.5 21B A3B compares
Its 131K-token context window is larger than 59% of the models we list. At $0.07 per million input tokens it is cheaper than 70% of comparable models.
About Baidu: ERNIE 4.5 21B A3B
A sophisticated text-based Mixture-of-Experts (MoE) model featuring 21B total parameters with 3B activated per token, delivering exceptional multimodal understanding and generation through heterogeneous MoE structures and modality-isolated routing. Supporting an..
Capabilities
How does Baidu: ERNIE 4.5 21B A3B stack up?
Compare side-by-side with other legacy models.
Model Information
| OpenRouter ID |
baidu/ernie-4.5-21b-a3b
|
| Provider | baidu |
| Release Date | August 12, 2025 |
| Context Length | 131,072 tokens |
| Max Completion | 8,000 tokens |
| Status | Active |
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $0.07 | $0.000070 |
| Output | $0.28 | $0.000280 |
External Resources
Frequently asked questions about Baidu: ERNIE 4.5 21B A3B
How much does Baidu: ERNIE 4.5 21B A3B cost?
Baidu: ERNIE 4.5 21B A3B costs $0.07 per million input tokens and $0.28 per million output tokens.
What is the context window of Baidu: ERNIE 4.5 21B A3B?
Baidu: ERNIE 4.5 21B A3B has a context window of 131,072 tokens (131K).
What can Baidu: ERNIE 4.5 21B A3B do?
Baidu: ERNIE 4.5 21B A3B supports tool use and function calling.
Who created Baidu: ERNIE 4.5 21B A3B?
Baidu: ERNIE 4.5 21B A3B is developed by Baidu and was released on August 12, 2025.
