Introducing Nexus AI o3 — our most capable model

Intelligence
without limits.

State-of-the-art language models, a developer-first API, and the tools to build AI applications that scale from prototype to production.

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Nexus AI Chat
Write a Python function to sort objects by date

Here's a clean, Pythonic solution:

# Sort list of dicts by date key
from datetime import datetime
def sort_by_date(items, key="date"):
return sorted(items, key=lambda x:
datetime.fromisoformat(x[key]))
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Our Models

Frontier intelligence,
ready to deploy.

From lightning-fast completions to deep reasoning — every model optimized for your use case.

Nexus-4o

Flagship

Our most capable model. Complex reasoning, nuanced writing, and multi-step coding tasks — handled with ease.

128K context $5 / 1M tokens

Nexus-mini

Fast

Optimized for speed and cost at scale. Ideal for real-time applications, chatbots, and high-volume production workloads.

32K context $0.15 / 1M tokens

Nexus-o1

Reasoning

Built for science, math, and complex problem-solving. Thinks step-by-step with extended chain-of-thought before answering.

200K context $15 / 1M tokens
quickstart.py
from nexus_ai import NexusAI
# Initialize the client
client = NexusAI(api_key="sk-nexus-...")
# Stream a completion
stream = client.chat.completions.create(
model="nexus-4o",
messages=[{
"role": "user",
"content": "Explain quantum entanglement"
}],
stream=True
)
# Print tokens as they arrive
for chunk in stream:
print(chunk.choices[0].delta.content)

Developer API

Build anything.
Ship everywhere.

A clean REST API with official SDKs for Python, Node.js, Ruby, and Go. OpenAI-compatible — migrate existing apps in minutes with zero code rewrites.

  • Streaming responses — Real-time token delivery for instant-feeling UX
  • Function calling — Structured JSON outputs and tool use, built in
  • Vision & multimodal — Process images, PDFs, and documents natively
  • Embeddings API — Semantic search, RAG pipelines, and vector stores
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