Baidu: ERNIE 4.5 21B A3B
Analysis Summary
ERNIE 4.5 21B A3B is a compact mixture-of-experts model from Baidu with a 131K context window, tool use, and function calling support. Without any published benchmark data, it is not possible to assess its reasoning, coding, or instruction-following quality against the broader field.
For businesses, the absence of benchmark evidence makes adoption a risk, particularly for client-facing or mission-critical workflows. The pricing at $0.07/1M input is modest, but without performance data there is no basis for recommending it over well-benchmarked alternatives at similar price points.
Until independent benchmark results are available, this model is best treated as experimental. Teams with a specific need for Baidu's ecosystem may evaluate it internally, but it cannot be recommended for general business deployment at this stage.
Assessed June 6, 2026
Editorial notes
Baidu's ERNIE 4.5 21B A3B has no benchmark data available, limiting confidence in its real-world capability assessment; tool use and function calling are supported.
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.
