Microsoft: Phi 4

microsoft/phi-4

Released Jan 10, 202516,384 context

$0.065/M input tokens$0.14/M output tokens

Microsoft Research Phi-4 is designed to perform well in complex reasoning tasks and can operate efficiently in situations with limited memory or where quick responses are needed.

At 14 billion parameters, it was trained on a mix of high-quality synthetic datasets, data from curated websites, and academic materials. It has undergone careful improvement to follow instructions accurately and maintain strong safety standards. It works best with English language inputs.

For more information, please see Phi-4 Technical Report

Providers for Phi 4

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

Performance for Phi 4

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Effective Pricing for Phi 4

Actual cost per million tokens across providers over the past hour

Apps using Phi 4

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Recent activity on Phi 4

Total usage per day on OpenRouter

Prompt

58.5M

Completion

7.59M

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

Uptime stats for Phi 4

Uptime stats for Phi 4 across all providers

Sample code and API for Phi 4

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.

Phi 4 - API Pricing & Providers | OpenRouter