Baidu: ERNIE 4.5 21B A3B Thinking

baidu/ernie-4.5-21b-a3b-thinking

Released Oct 9, 2025131,072 context

$0.07/M input tokens$0.28/M output tokens

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, and expert-level academic benchmarks.

Providers for ERNIE 4.5 21B A3B Thinking

OpenRouter routes requests to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime.

Performance for ERNIE 4.5 21B A3B Thinking

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Effective Pricing for ERNIE 4.5 21B A3B Thinking

Actual cost per million tokens across providers over the past hour

Apps using ERNIE 4.5 21B A3B Thinking

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Recent activity on ERNIE 4.5 21B A3B Thinking

Total usage per day on OpenRouter

Prompt

420K

Reasoning

200K

Completion

86K

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.

Uptime stats for ERNIE 4.5 21B A3B Thinking

Uptime stats for ERNIE 4.5 21B A3B Thinking across all providers

Sample code and API for ERNIE 4.5 21B A3B Thinking

OpenRouter normalizes requests and responses across providers for you.

OpenRouter provides an OpenAI-compatible completion API to 300+ models & providers that you can call directly, or using the OpenAI SDK. Additionally, some third-party SDKs are available.

In the examples below, the OpenRouter-specific headers are optional. Setting them allows your app to appear on the OpenRouter leaderboards.

Using third-party SDKs

For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.

See the Request docs for all possible fields, and Parameters for explanations of specific sampling parameters.

ERNIE 4.5 21B A3B Thinking - API Pricing & Providers | OpenRouter