Last refreshed 2026-06-08. Next refresh: weekly.
Why use o3 on OpenAI API?
OpenAI API offers o3 with pay-as-you-go pricing at $2.00/1M input tokens. OpenAI is a leading AI research and deployment company dedicated to developing safe and beneficial artificial general intelligence (AGI) for humanity.
Compare o3 across 3 providers to find the best fit for your use caseInput / 1M
$2.00
Output / 1M
$8.00
Cache
read $0.50
Batch
-50% · in $1.00 / out $4.00
Setup recipe
Python + curlInstall
pip install openaiAuth
export OPENAI_API_KEY=...Call
import os
from openai import OpenAI
client = OpenAI() # reads OPENAI_API_KEY from env
response = client.chat.completions.create(Model ID
o3Request example
import os
from openai import OpenAI
client = OpenAI() # reads OPENAI_API_KEY from env
response = client.chat.completions.create(
model="o3",
messages=[{"role": "user", "content": "Hello"}]
)
print(response.choices[0].message.content)Gotchas
- Use the model slug directly, e.g. "gpt-4o" or "gpt-4.1-mini".
- The examples expect OPENAI_API_KEY; rename it only if your application config maps the new variable.
Compare o3 Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| OpenAI API | $2.00 | $8.00 |
| OpenRouter | $2.00 | $8.00 |
| Vercel AI Gateway | $2.00 | $8.00 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $2.00 |
| Output tokens | $8.00 |
Capabilities
VisionMultimodalReasoningJSON / Tool useStructured OutputsCode ExecutionPrompt CachingBatch API
About o3
OpenAI o3 reasoning model with advanced multi-step problem-solving capabilities.
Get Started
Model Specs
Released2025-04-16
Context200k
ArchitectureDecoder Only
Knowledge cutoff2024-06