GPT-6 Luna

Name: OpenAI: GPT-6 Luna
Brand: openai
SKU: openai/gpt-6-luna
Price: 0.11 USD
Availability: InStock

openai/gpt-6-luna

GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol.

$0.11 in · $0.55 out per 1M tokens1M contextSep 22, 2026

about 0.03¢ a message

A typical message: about 500 tokens you send and 500 it writes.

Chat with GPT-6 Luna

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Also:latest batch

Spec sheet

Published facts from the catalog, billed prices and what we measured here. Anything not measured says so.

Price, billed here

Input, per 1M tokens: $0.11provider $0.10
Output, per 1M tokens: $0.55provider $0.50
Cached input, per 1M: $0.011provider $0.01
Cache write, per 1M: $0.1375provider $0.125
Margin: +10%

Context and formats

Context window: 1,050,000 tokens
Longest answer: 128,000 tokens
Reads: text, images, and files
Makes: text
First listed: 2026-09-22

Measured here, last 7 days

First token, median: not measured
Answered without error: not measured

Tools and JSON

Tool calling: declaredthe provider's claim, not yet measured here
JSON output: declaredthe provider's claim, not yet measured here

Price and latency history as JSON: GET /api/planet/history?id=openai/gpt-6-luna.

About

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...

In OpenAI's words.

Try it here

Cmd+Enter sends

The answer appears here.

Measured here

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Call it

Use one OpenAI compatible endpoint, this model's id and an am_live_ key from the dashboard. You can also try it in chat first with no key.

curl https://useantimatter.com/v1/chat/completions \
  -H "Authorization: Bearer $ANTIMATTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "openai/gpt-6-luna", "messages": [{"role": "user", "content": "Hello"}]}'

Everything else is in the docs.

Embed this

A badge showing this model's live price per million tokens, as billed here, for a README or a site. It links back to this page.

<a href="https://useantimatter.com/planet/openai/gpt-6-luna"><img src="https://useantimatter.com/api/badge/price?id=openai%2Fgpt-6-luna" alt="GPT-6 Luna price on Antimatter" height="28"></a>

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