Last refreshed 2026-06-26. Next refresh: weekly.
Why use GPT-5.6 Luna on OpenAI API?
OpenAI API offers GPT-5.6 Luna with pay-as-you-go pricing at $1.00/1M input tokens. OpenAI is a leading AI research and deployment company dedicated to developing safe and beneficial artificial general intelligence (AGI) for humanity.
Setup 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-5.6-lunaRequest example
import os
from openai import OpenAI
client = OpenAI() # reads OPENAI_API_KEY from env
response = client.chat.completions.create(
model="gpt-5.6-luna",
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.
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $1.00 |
| Output tokens | $6.00 |
Capabilities
About GPT-5.6 Luna
OpenAI's fast, low-cost GPT-5.6 model. Luna is the affordable tier in the Sol, Terra, and Luna lineup, optimized for latency-sensitive applications such as summarization, drafting, autocomplete, and routine automation. It is available only to select trusted partners until broad API access launches.
FAQ
What does GPT-5.6 Luna cost on OpenAI API?
On OpenAI API, GPT-5.6 Luna costs $1.00 per 1M input tokens and $6.00 per 1M output tokens.
What API model ID do I use for GPT-5.6 Luna on OpenAI API?
Use the model ID gpt-5.6-luna when calling OpenAI API's API.
Who created GPT-5.6 Luna?
GPT-5.6 Luna was created by OpenAI as part of the GPT-5.6 model family.
Is GPT-5.6 Luna open source?
GPT-5.6 Luna is not open source; the seed data lists it as proprietary.