Using Phi 3.5 MoE Instruct on Fireworks AI

Implementation guide · Phi-3 · Microsoft Research

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Fireworks AI exposes Phi 3.5 MoE Instruct through model ID phi-3.5-moe-instruct. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-05-19. Next refresh: weekly.

Quick Start

1
Create an account at Fireworks AI and generate an API key.
2
Use the Fireworks AI SDK or REST API to call phi-3.5-moe-instruct — see the documentation for request format.
3
You'll be billed $0.50/1M input, $0.50/1M output tokens. See full pricing.

API Portal Documentation Pricing Model Card

Code Examples

Install

pip install openai

API key

FIREWORKS_API_KEY

Model ID

phi-3.5-moe-instruct

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".

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-3.5-moe-instruct",
    messages=[{"role": "user", "content": "Hello"}]
)
print(response.choices[0].message.content)