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OpenAI: GPT-6 Luna (Reasoning)

openai/gpt-6-luna-reasoning

OpenAI: GPT-6 Luna (Reasoning) is a 1,050,000-token model served on Composite at $0.0160 per million tokens in and $0.250 per million tokens out.

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Specifications

Specifications and pricing as served by Composite
Model IDopenai/gpt-6-luna-reasoning
ProviderOpenAI
Context window1,050,000 tokens
Acceptsfile, image, text
Returnstext
Input price$0.0160 per million tokens
Output price$0.250 per million tokens
Prompt cachingSupported — cached input is 60% off the list rate on pay-as-you-go credits
Web search$0.0100 per result
ThinkingOptional - see "OpenAI: GPT-6 Luna (Reasoning) (Reasoning)" in the catalog to turn it on by default
ModeratedYes - by the provider
Cost on a monthly plan1 request of the daily allowance per call
Plans that may spend on itEvery plan, plus pay-as-you-go credits
Routing endpoints1

Measured on Composite

This model has not carried enough traffic on Composite yet to publish a success rate, a latency figure or a traffic rank. The numbers appear here once it has.

Pricing

$0.0160 per million tokens input · $0.250 per million tokens output

Input and output are charged at the provider’s list price.

On a monthly plan, one call costs 1 request of that day's allowance.

Provider

OpenAI

Roleplay fit

This is an OpenAI model, a dependable baseline with broad instruction-following and consistent formatting across long conversations.

Context behavior

With a 1,050,000-token context window, it can hold a long-running roleplay or a full lorebook in memory without losing earlier plot details, so it suits multi-session campaigns and character cards with heavy backstory.

Cost for regular use

It is priced low enough for high-volume daily roleplay without the per-message cost adding up quickly.

From the provider

GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol. It is suited for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic...

Supplied by OpenAI, not written by Composite.