Baidu: ERNIE 4.5 21B A3B
Analysis Summary
Baidu: ERNIE 4.5 21B A3B comes from Baidu. It was released in August 2025. We place it in the Legacy tier, where it sits at #396 of 571 models overall.
Its 131K-token context window is larger than 60% of the models we list, suiting long documents, large codebases, and retrieval-heavy workloads. It supports tool use and function calling.
At $0.070 input and $0.280 output per 1M tokens, Baidu: ERNIE 4.5 21B A3B is aggressively priced for high-volume use which makes it easy to justify for cost-sensitive, high-throughput deployments. Baidu: ERNIE 4.5 21B A3B is worth evaluating where Baiduās ecosystem and the modelās specific capabilities fit your workflow.
Editorial notes
Baidu ERNIE 4.5 21B A3B has tool use and low pricing but no benchmark data; scored conservatively until performance data is available.
Assessed May 31, 2026
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 60% 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.
