OpenAI
GPT-6 Luna
GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol.
Model ID
openai/gpt-6-luna- Context window
- 1.05M
- tokens
- Max output
- 66K
- tokens
- Input
- $0.1
- per 1M tokens
- Output
- $0.5
- per 1M tokens
Cache read $0.01 · Cache write $0.125
Quickstart
Call GPT-6 Luna in one request.
Point the SDK you already use at xKiro and pass the model ID. The same key works for every model in the catalog.
SDK guidesimport osfrom openai import OpenAI client = OpenAI( api_key=os.environ["XKIRO_API_KEY"], base_url="https://api.xkiro.com/v1",) res = client.chat.completions.create( model="", messages=[ {"role": "user", "content": "Explain HTTP caching in two sentences."}, ],) print(res.choices[0].message.content)✓ 200 OK
"model": "openai/gpt-6-luna"
HTTP caching stores copies of responses so later requests can be served without contacting the origin server. Headers such as Cache-Control and ETag decide how long a copy stays fresh and how it is revalidated.
14 input · 42 output tokens · $0.000022 at this model’s rates
Create an API key in the dashboard and export it as XKIRO_API_KEY.
Pricing
What GPT-6 Luna costs.
Billed per million tokens at these rates, from your plan’s budget or your wallet.
$0.1
Input
per 1M tokens
$0.5
Output
per 1M tokens
$0.01
Cache read
per 1M tokens
$0.125
Cache write
per 1M tokens
On a plan
From $0.0034 / $0.017 on a plan
Plan: up to −96%
Usage on a plan comes out of your allowance, so GPT-6 Luna costs from $0.0034 / $0.017 per 1M tokens when you use the whole allowance — up to 96% less than pay-as-you-go.
Compare plans →OpenAI's own API lists GPT-6 Luna at $0.1 / $0.5 per 1M tokens.
On a plan: up to 96% less than the official API.
Pay as you go here costs the same as the official API.
OpenAI pricing page (lowest tier), checked Oct 21, 2026Billed fairly
- Requests that fail with a 5xx error are never billed
- Retrying an identical blocking request replays the first result — no double charge
- Cancel a stream and pay only for the tokens generated
Specifications
Limits and capabilities.
- Context window
- 1,050,000 tokens
- Max output
- 65,536 tokens
- Input
- Text · Image
- Output
- Text
- Provider
- OpenAI
- Model ID
- openai/gpt-6-luna
- Release date
- Sep 22, 2026
- Good for
- Long context
Capabilities
- Tool useSupported
- VisionSupported
- Video inputNot supported
- ReasoningSupported
Reasoning effort
- none
- low
- medium
- high
- xhigh
- max
Set it with reasoning_effort in the OpenAI format, or thinking in the Anthropic format.
Supported parameters
- max_tokens
- temperature
- top_p
- stop
- frequency_penalty
- presence_penalty
- seed
- stream
- tools
- tool_choice
- response_format
- structured_outputs
- reasoning
- include_reasoning
Compare
Similar models.
Closest in price and context window — same provider first, then alternatives from other providers.
Browse all 69 models| Model | Input / 1M | Output / 1M | ||
|---|---|---|---|---|
| GPT-6 LunaThis modelVision · Reasoning · Tool use | 1.05M | $0.1 | $0.5 | $0.01 |
| GPT-5.6 Luna−50%Vision · Reasoning · Tool use | 1M | $0.1 | $0.6 | $0.05 |
| GPT-6.1 TerraVision · Reasoning · Tool use | 1.05M | $1 | $5 | $0.05 |
| GPT-5.6 Terra−50%Vision · Reasoning · Tool use | 1M | $1 | $6 | $0.125 |
 Haiku 5.5NewVision · Reasoning · Tool use | 1M | $0.1 | $0.5 | $0.01 |
 DeepSeek V4 Flash 0731−35%Pay as you goReasoning · Tool use | 1.05M | $0.091 | $0.182 | $0.0182 |
| DeepSeek V4.1 Flash−50%Pay as you goVision · Reasoning · Tool use | 1.05M | $0.075 | $0.3 | $0.0015 |
Start building with GPT-6 Luna.
Create a key, point your SDK at xKiro and call openai/gpt-6-luna.
No credit card · Cancel anytime · 26 free models, free forever