Phi 4 API
Run microsoft/phi-4 through FastInfra's OpenAI-compatible API.
Pay per token, no subscription, routed to the cheapest available provider.
Phi 4 pricing
Billed per token used. Prices sync automatically from wholesale providers.
| Direction | Price per 1M tokens |
|---|---|
| Input | $0.07 |
| Output | $0.15 |
Served by 2 providers
Requests route to DeepInfra by default (cheapest).
Pin a specific provider with the :provider suffix.
| Provider | Upstream model ID |
|---|---|
| openrouter | microsoft/phi-4 |
| deepinfra | microsoft/phi-4 |
Call Phi 4 in 30 seconds
Works with any OpenAI SDK — change the base URL and API key only.
Python
from openai import OpenAI
client = OpenAI(api_key="YOUR_API_KEY", base_url="https://api.fastinfra.ai/v1")
response = client.chat.completions.create(
model="microsoft/phi-4",
messages=[{"role": "user", "content": "Hello!"}]
)
print(response.choices[0].message.content)curl
curl https://api.fastinfra.ai/v1/chat/completions \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "microsoft/phi-4",
"messages": [{"role": "user", "content": "Hello!"}]
}'Phi 4 — common questions
How much does the microsoft/phi-4 API cost?
On FastInfra, microsoft/phi-4 costs $0.0735/1M input, $0.147/1M output tokens. Billing is per token used, with no subscription.
Is microsoft/phi-4 compatible with the OpenAI SDK?
Yes. FastInfra exposes microsoft/phi-4 through an OpenAI-compatible endpoint at https://api.fastinfra.ai/v1 — point any OpenAI SDK at that base URL with a FastInfra API key and keep your existing code.
Which providers serve microsoft/phi-4?
microsoft/phi-4 is available from 2 provider(s): openrouter, deepinfra. Requests route to DeepInfra by default (cheapest); append ":provider" to the model ID to pin one.
Related models
Compare side by side: Phi 4 vs All Minilm · Phi 4 vs Gemma2:2b · Phi 4 vs Gemma3:1b