Replicate Python SDK Broken on httpx — Fix the ImportError or Switch to NexaAPI

#python #replicate #api #ai

If you've recently upgraded your Python environment and started seeing this error:

ImportError: cannot import name 'Proxy' from 'httpx'

You're not alone. The Replicate Python SDK has a known compatibility issue with newer versions of httpx (tracked in GitHub issue #457). Hundreds of developers have been hit by this after upgrading to Python 3.13 or updating their httpx dependency.

What's Happening

The Replicate Python SDK imports Proxy from httpx internally. When httpx removed or changed the Proxy class in newer versions, the Replicate SDK broke with an ImportError.

Affected scenarios:

Upgrading Python to 3.13+
Running pip install --upgrade httpx (or any dependency that pulls in a newer httpx)
Fresh installs where pip resolves to a newer httpx version
Docker containers with updated base images

Quick Fix: Pin httpx

The fastest workaround is to downgrade httpx:

pip install "httpx==0.28.1" replicate

⚠️ Warning: Pinning httpx to an old version may break other libraries in your project (OpenAI SDK, LangChain, FastAPI clients, etc.). This is a band-aid, not a fix.

Why This Keeps Happening

The Replicate Python SDK has a pattern of breaking due to dependency conflicts:

v1.0.0: Breaking change — replicate.run() now returns FileOutput objects instead of URLs
httpx compatibility: SDK breaks when httpx is updated (open issue as of March 2026)
v2.0.0b1 beta: New replicate.use() interface, replicate.stream() deprecated
Python 3.14: Incompatibility due to Pydantic V1 usage (open issue)

Every few months, something breaks. If you're building a production app, this is maintenance overhead you shouldn't have to carry.

Permanent Fix: Migrate to NexaAPI in 5 Minutes

NexaAPI has its own clean Python SDK with minimal dependencies — no httpx, no FileOutput objects, no module-level restrictions. Works on Python 3.8+.

Python — Works on Python 3.8+

# Install: pip install nexaapi
# No httpx version pinning required

from nexaapi import NexaAPI

client = NexaAPI(api_key='YOUR_API_KEY')

# Generate an image — clean, simple, no dependency conflicts
response = client.image.generate(
    model='flux-schnell',  # same model available on Replicate
    prompt='A futuristic cityscape at sunset',
    width=1024,
    height=1024
)

print(response.url)  # Direct URL — always works
# Cost: $0.003/image

JavaScript / Node.js

// Install: npm install nexaapi
import NexaAPI from 'nexaapi';

const client = new NexaAPI({ apiKey: 'YOUR_API_KEY' });

async function generateImage() {
  const response = await client.image.generate({
    model: 'flux-schnell',
    prompt: 'A futuristic cityscape at sunset',
    width: 1024,
    height: 1024
  });

  return response.url; // Migrated from Replicate in under 5 minutes
}

Before vs After

# BEFORE (Replicate — broken on newer httpx)
import replicate
# ImportError: cannot import name 'Proxy' from 'httpx'

output = replicate.run(
    "black-forest-labs/flux-schnell",
    input={"prompt": "A sunset over mountains"}
)
image_url = output[0].url  # FileOutput object — extra complexity

# AFTER (NexaAPI — works on any Python 3.8+)
from nexaapi import NexaAPI

client = NexaAPI(api_key='YOUR_NEXAAPI_KEY')
response = client.image.generate(
    model='flux-schnell',
    prompt='A sunset over mountains'
)
image_url = response.url  # Direct URL, no dependency issues

Pricing Comparison

Model	Replicate	NexaAPI	Savings
Flux Schnell	~$0.003/image	$0.003/image	Same price, no dependency hell
SDXL	~$0.005/image	$0.003/image	40% cheaper
Flux 2 Pro	~$0.055/image	$0.020/image	63% cheaper
Video generation	~$0.10+/run	$0.03/run	70% cheaper