Last refreshed 2026-04-19. Next refresh: weekly.
Why use Phi 4 Reasoning Plus on Fireworks AI?
Fireworks AI offers Phi 4 Reasoning Plus with pay-as-you-go pricing at $0.50/1M input tokens. Fireworks AI offers a generative AI platform as a service, focusing on rapid product iteration and cost-efficient AI deployment.
Input / 1M
$0.50
Output / 1M
$0.50
Cache
Not sourced
Batch
Not sourced
Setup recipe
Python + curlInstall
pip install openaiAuth
export FIREWORKS_API_KEY=...Call
import os
from openai import OpenAI
client = OpenAI(
api_key=os.environ["FIREWORKS_API_KEY"],Model ID
phi-4-reasoning-plusRequest example
import os
from openai import OpenAI
client = OpenAI(
api_key=os.environ["FIREWORKS_API_KEY"],
base_url="https://api.fireworks.ai/inference/v1"
)
response = client.chat.completions.create(
model="phi-4-reasoning-plus",
messages=[{"role": "user", "content": "Hello"}]
)
print(response.choices[0].message.content)Gotchas
- Fireworks model IDs use "accounts/fireworks/models/{model-name}" format, e.g. "accounts/fireworks/models/llama4-scout-instruct-basic" or "accounts/fireworks/models/deepseek-r1".
- The examples expect FIREWORKS_API_KEY; rename it only if your application config maps the new variable.
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $0.50 |
| Output tokens | $0.50 |
Capabilities
Reasoning
FAQ
What does Phi 4 Reasoning Plus cost on Fireworks AI?
On Fireworks AI, Phi 4 Reasoning Plus costs $0.5 per 1M input tokens and $0.5 per 1M output tokens.
What is the context window for Phi 4 Reasoning Plus on Fireworks AI?
Phi 4 Reasoning Plus supports a 128,000 token context window on Fireworks AI.
Who created Phi 4 Reasoning Plus?
Phi 4 Reasoning Plus was created by Microsoft Research as part of the Phi-4 model family.
Is Phi 4 Reasoning Plus open source?
Phi 4 Reasoning Plus is open source according to the seed data.
Get Started
Model Specs
Released2025-01-01
Parameters14B
Context128K
ArchitectureDecoder Only