Fix Fireworks AI authentication error
Quick answer
Fireworks AI authentication errors occur when the API key is missing, incorrect, or the client is not configured with the proper
base_url. Use the OpenAI SDK with api_key=os.environ["FIREWORKS_API_KEY"] and set base_url="https://api.fireworks.ai/inference/v1" to authenticate successfully. ERROR TYPE
config_error ⚡ QUICK FIX
Set the
base_url to https://api.fireworks.ai/inference/v1 and pass your API key from os.environ["FIREWORKS_API_KEY"] when creating the OpenAI client.Why this happens
Fireworks AI uses an OpenAI-compatible API but requires specifying a custom base_url and the correct API key environment variable. A common mistake is to instantiate the client without the base_url or to hardcode the API key incorrectly. This leads to authentication errors such as 401 Unauthorized or Invalid API key.
Example of broken code causing authentication error:
from openai import OpenAI
import os
client = OpenAI(api_key="YOUR_FIREWORKS_API_KEY") # Missing base_url
response = client.chat.completions.create(
model="accounts/fireworks/models/llama-v3p3-70b-instruct",
messages=[{"role": "user", "content": "Hello"}]
)
print(response.choices[0].message.content) output
openai.error.AuthenticationError: Invalid API key provided
The fix
Use the OpenAI SDK with the base_url parameter set to Fireworks AI's endpoint and load the API key from the environment variable FIREWORKS_API_KEY. This ensures the client sends requests to the correct URL with valid credentials.
This code authenticates correctly and returns the model's response:
from openai import OpenAI
import os
client = OpenAI(
api_key=os.environ["FIREWORKS_API_KEY"],
base_url="https://api.fireworks.ai/inference/v1"
)
response = client.chat.completions.create(
model="accounts/fireworks/models/llama-v3p3-70b-instruct",
messages=[{"role": "user", "content": "Hello"}]
)
print(response.choices[0].message.content) output
Hello! How can I assist you today?
Preventing it in production
To avoid authentication errors in production, always:
- Store API keys securely in environment variables, never hardcode them.
- Validate that
base_urlmatches the Fireworks AI endpointhttps://api.fireworks.ai/inference/v1. - Implement retry logic with exponential backoff for transient errors.
- Log authentication failures clearly to detect misconfiguration early.
Key Takeaways
- Always specify
base_url="https://api.fireworks.ai/inference/v1"when using Fireworks AI with the OpenAI SDK. - Load your API key securely from
os.environ["FIREWORKS_API_KEY"]to avoid authentication errors. - Use model names prefixed with
accounts/fireworks/models/to ensure correct model selection. - Implement retries with exponential backoff to handle transient API errors gracefully.