Last refreshed 2026-05-10. 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 2 providers to find the best fit for your use caseSetup recipe
Python + curlpip install openaiexport OPENAI_API_KEY=...import os
from openai import OpenAI
client = OpenAI() # reads OPENAI_API_KEY from env
response = client.chat.completions.create(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 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $2.00 |
| Output tokens | $8.00 |
Capabilities
About o3
OpenAI o3 reasoning model with advanced multi-step problem-solving capabilities.
FAQ
What does o3 cost on OpenAI API?
On OpenAI API, o3 costs $2.00 per 1M input tokens and $8.00 per 1M output tokens.
What is the context window for o3 on OpenAI API?
o3 supports a 200,000 token context window on OpenAI API.
How does OpenAI API compare to other o3 providers?
o3 is available from 2 providers. The cheapest input pricing is $2.00/1M tokens from OpenAI API.
What API model ID do I use for o3 on OpenAI API?
Use the model ID o3 when calling OpenAI API's API.
Who created o3?
o3 was created by OpenAI as part of the o3 model family.
Is o3 open source?
o3 is not open source; the seed data lists it as proprietary.