OpenAI

o3

OpenAI's most powerful reasoning model. Designed for complex multi-step problems, scientific research, advanced coding, and agentic workflows.

reasoningpremium

Use this model free ← All models

Pricing via Neureus

Save 10% vs OpenRouter

Context window 200K tokens

Max output 100K tokens

Input (OpenRouter) $10.00/M

Input (Neureus) $9.00/M

Output (OpenRouter) $40.00/M

Output (Neureus) $36.00/M

Neureus prices all models at 10% below published OpenRouter rates, updated monthly. Free tier includes 5M tokens →

Use this model

One API. Every model.

Swap any model ID in a single field. Neureus handles routing, caching, and tenant isolation automatically.

  chat.ts 
const res = await fetch('https://app.neureus.ai/ai/chat', {
  method: 'POST',
  headers: {
    'Authorization': `Bearer ${NEUREUS_API_KEY}`,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    model: 'openai/o3',
    messages: [{ role: 'user', content: 'Hello!' }],
  }),
});
const { message } = await res.json();

Semantic response caching — repeated queries served free from edge

Per-tenant spend caps — set a monthly limit per customer

PII guardrails — optional PHI/PII detection before each request

Automatic failover — falls back to an alternate provider on error

o3

One API. Every model.

Start using o3for free.

Start using o3
for free.