Last refreshed 2026-05-10. Next refresh: weekly.
Why use GPT-5 on OpenAI API?
OpenAI API offers GPT-5 with pay-as-you-go pricing at $1.25/1M 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 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-5Request example
import os
from openai import OpenAI
client = OpenAI() # reads OPENAI_API_KEY from env
response = client.chat.completions.create(
model="gpt-5",
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 Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| Replicate API | $1.25 | $10.00 |
| OpenRouter | $1.25 | $10.00 |
| OpenAI API | $1.25 | $10.00 |
| Vercel AI Gateway | $1.25 | $10.00 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $1.25 |
| Output tokens | $10.00 |
Capabilities
About GPT-5
OpenAI's previous intelligent reasoning model with configurable reasoning effort. Released August 2025. Supports minimal, low, medium, and high reasoning levels. Succeeded by GPT-5.1 and later models.
FAQ
What does GPT-5 cost on OpenAI API?
On OpenAI API, GPT-5 costs $1.25 per 1M input tokens and $10.00 per 1M output tokens.
What is the context window for GPT-5 on OpenAI API?
GPT-5 supports a 400k token context window on OpenAI API.
How does OpenAI API compare to other GPT-5 providers?
GPT-5 is available from 4 providers. The cheapest input pricing is $1.25/1M tokens from Replicate API.
What API model ID do I use for GPT-5 on OpenAI API?
Use the model ID gpt-5 when calling OpenAI API's API.
Who created GPT-5?
GPT-5 was created by OpenAI as part of the GPT-5 model family.
Is GPT-5 open source?
GPT-5 is not open source; the seed data lists it as proprietary.