How much does Phi 4 cost?

Phi 4 is billed pay-as-you-go at $0.08 per 1M input tokens and $0.16 per 1M output tokens. There is no subscription — you only pay for what you use.

Phi 4 is Microsoft's chat model, accessible through the Api.Airforce API.

Is Phi 4 free to use?

Phi 4 is a paid, pay-as-you-go model — no subscription, you are only charged for usage.

How do I use Phi 4 via the API?

Phi 4 is OpenAI-compatible. Point any OpenAI SDK at https://api.airforce/v1 and pass the model ID phi-4 with your Api.Airforce API key.

Phi 4 is Microsoft's chat model, served through the unified Api.Airforce gateway alongside 100+ other models.

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Phi 4

API model name: phi-4

Phi 4 is Microsoft's chat model, served on the Api.Airforce unified API. It is priced at $0.08 per million input tokens and $0.16 per million output tokens. That is below the provider's $0.07 official input rate. Access it through the OpenAI-compatible API with one key, alongside 100+ other models on Api.Airforce.

Get an API key View pricing

Pricing

Input / 1M tokens

$0.08

Output / 1M tokens

$0.16

Cache read / 1M tokens

$0.01

Official input rate

$0.07

Official output rate

$0.14

Api.Airforce price vs. the provider's official rate.

Specifications

Provider: Microsoft
Type: chat model

Benchmarks

Independent evaluations and measured speed from Artificial Analysis.

MMLU-Pro71%

GPQA Diamond57%

Humanity's Last Exam4%

LiveCodeBench23%

AIME 202518%

MATH-50081%

Output speed43.2 tok/s

Time to first token0.91 s

Phi-4

Source: Benchmark data by Artificial Analysis (artificialanalysis.ai)

What is Phi 4 used for?

Chatbots & assistants — conversational AI, drafting, summarizing and Q&A.

Phi 4 vs. similar models

Model	Intelligence	Context	Input / 1M	Output / 1M
Phi 4	—	—	$0.08	$0.16
GPT-5.2 Chat Latest	—	400K	$1.84	$14.70
GPT-5.2 Codex	—	—	$1.84	$14.70
GPT-5.2 Pro	—	—	$22.05	$176.40

Prices are Api.Airforce pay-as-you-go rates per 1M tokens. Context is the maximum input length.

Phi 4 — frequently asked questions

How much does Phi 4 cost?: Phi 4 is billed pay-as-you-go at $0.08 per 1M input tokens and $0.16 per 1M output tokens. There is no subscription — you only pay for what you use.
What can Phi 4 do?: Phi 4 is Microsoft's chat model, accessible through the Api.Airforce API.
Is Phi 4 free to use?: Phi 4 is a paid, pay-as-you-go model — no subscription, you are only charged for usage.
How do I use Phi 4 via the API?: Phi 4 is OpenAI-compatible. Point any OpenAI SDK at https://api.airforce/v1 and pass the model ID phi-4 with your Api.Airforce API key.
Who makes Phi 4?: Phi 4 is Microsoft's chat model, served through the unified Api.Airforce gateway alongside 100+ other models.

All models·Quickstart·Chat API reference

Use Phi 4 via the API

OpenAI-compatible — point any OpenAI SDK at https://api.airforce/v1 and pass phi-4 as the model.

cURL

curl https://api.airforce/v1/chat/completions \
  -H "Authorization: Bearer $AIRFORCE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "phi-4",
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'

Python

from openai import OpenAI
client = OpenAI(base_url="https://api.airforce/v1", api_key="$AIRFORCE_API_KEY")
r = client.chat.completions.create(
    model="phi-4",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(r.choices[0].message.content)

JavaScript

import OpenAI from "openai";
const client = new OpenAI({ baseURL: "https://api.airforce/v1", apiKey: process.env.AIRFORCE_API_KEY });
const r = await client.chat.completions.create({
  model: "phi-4",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(r.choices[0].message.content);