Last refreshed 2026-05-10. Next refresh: weekly.
Why use GPT-5 Nano on OpenAI API?
OpenAI API offers GPT-5 Nano with pay-as-you-go pricing at $0.05/1M input tokens. OpenAI is a leading AI research and deployment company dedicated to developing safe and beneficial artificial general intelligence (AGI) for humanity.
Compare GPT-5 Nano across 4 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(gpt-5-nanoRequest example
import os
from openai import OpenAI
client = OpenAI() # reads OPENAI_API_KEY from env
response = client.chat.completions.create(
model="gpt-5-nano",
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 GPT-5 Nano Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| Replicate API | $0.05 | $0.40 |
| OpenRouter | $0.05 | $0.40 |
| OpenAI API | $0.05 | $0.40 |
| Vercel AI Gateway | $0.05 | $0.40 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $0.05 |
| Output tokens | $0.40 |
Capabilities
About GPT-5 Nano
Fastest, cheapest GPT-5 variant for summarization and classification tasks. Also available via Realtime API.
FAQ
What does GPT-5 Nano cost on OpenAI API?
On OpenAI API, GPT-5 Nano costs $0.05 per 1M input tokens and $0.40 per 1M output tokens.
What is the context window for GPT-5 Nano on OpenAI API?
GPT-5 Nano supports a 400k token context window on OpenAI API.
How does OpenAI API compare to other GPT-5 Nano providers?
GPT-5 Nano is available from 4 providers. The cheapest input pricing is $0.05/1M tokens from Replicate API.
What API model ID do I use for GPT-5 Nano on OpenAI API?
Use the model ID gpt-5-nano when calling OpenAI API's API.
Who created GPT-5 Nano?
GPT-5 Nano was created by OpenAI as part of the GPT-5 model family.
Is GPT-5 Nano open source?
GPT-5 Nano is not open source; the seed data lists it as proprietary.