OpenAI's most efficient GPT-6 model, for focused, high-volume tasks. 1.05M context, 128K output, text, image and file input, reasoning; above 272K prompt tokens input doubles and output rises 1.5×.
Modalities
Text+Image → Text
Below release
Not established
Weights
Not published
Where it sits in the catalogue Kyma measures
Every number against every text model Kyma prices per token — a stated rule, not a chosen line-up.
$0.135
output $0.675 · cached $0.0135
median $1.013 · best $0.0494
$0.675
per 1M tokens generated
median $3.645 · best $0.218
100%
30 observations since 2026-10-25
median 100.0% · best 100.0%
45 tok/s
probe median, one fixed prompt
median 46.1 tok/s · best 160.1 tok/s
1.40 s
probe median, to a complete answer
median 1.33 s · best 0.46 s
1.05M
max output 128,000
published by OpenAI, not measured here
Tick above each rail is this model, below it the other 83. Dashed rule is the field median, solid is its best. Better is left; the axis stops at the 90th percentile, so a few models sit past its right edge.
Usage
How much this model is actually called here.
Rank
#95
of 112 active models
Tokens served
2.7K
all-time
Platform share
0.0%
of all tokens
Pricing
Pay per token. Cached input bills at this model’s own cached rate, listed below.
+ Estimate your workload− Estimate your workload
Estimated monthly cost
$16.04
$0.5346 / day on GPT-6 Luna
Same workload on:
Estimates use list pricing with cached input at this model's own cached rate. Actual bills depend on real token counts, and every response includes its exact cost.
How it compares
Against the peers people actually weigh it against.
| Spec | GPT-6 Luna | GPT-5.6 Sol Pro | GPT-5.6 Sol |
|---|---|---|---|
| Input /1M | $0.135 | $2.70 | $3.151 |
| Output /1M | $0.675 | $13.50 | $15.753 |
| Context | 1M | 1M | 1M |
| Tools | Yes | Yes | Yes |
| Reasoning | Yes | Yes | Yes |
| Throughput | 45 tok/s |
Quick start
Up and running in under two minutes.
- 1
Create an API key
Sign up and grab a key from the dashboard — $0.50 free credit on the free tier, which covers GPT-6 Luna. No card required.
Get API key → - 2
Make your first request
Drop in your key and send a chat completion — fully OpenAI-compatible.
curl https://kymaapi.com/v1/chat/completions \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "gpt-6-luna", "messages": [ {"role": "user", "content": "Explain prompt caching in one paragraph."} ] }' - 3
Stream responses
Add
"stream": trueto receive tokens as they arrive.curl https://kymaapi.com/v1/chat/completions \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "gpt-6-luna", "stream": true, "messages": [{"role": "user", "content": "Hello!"}] }'
FAQ
Common questions about this model.
What is the context window of GPT-6 Luna?
How much does the GPT-6 Luna API cost?
Does GPT-6 Luna support function calling?
Are the weights for GPT-6 Luna publicly available?
Is GPT-6 Luna ever served below the precision its creator released it at?
How do I use GPT-6 Luna?
More models by OpenAI
See all 15 →| Model | Context | Input | Output |
|---|---|---|---|
GPT-6.1 Sol | 1M | $2.70 | $13.50 |
GPT Image 2.5 Flare | — | $0.019 / image | |
GPT-6 Astra | 1M | $13.50 | $67.50 |
GPT Transcribe | — | $0.006075 / min | |
GPT-5.6 Terra | 1M | $2.70 | $16.20 |
GPT-5.6 Luna | 1M | $0.3127 | $1.877 |
GPT-5.6 Luna Pro | 1M | $0.1548 | $0.9288 |
GPT-5.6 Terra Pro | 1M | $2.70 | $16.20 |
