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openai · chat model

Try GPT-6 Luna onlinenew

openai/gpt-6-luna

Added to OpenRouter: 22 Sept 2026

First seen here: · Specs updated:

Use GPT-6 Luna in your browser. Explore pricing and capabilities below, or start a chat in OpenCraft.

Input price$0.05per M tokenscheaper than 92% of chat models
Output price$0.25per M tokenscheaper than 85% of chat models
Cache read$0.0050per M tokens
Context window1.1Mtokensof the largest window in the catalog (10M)

GPT-6 Luna pricing: what a turn costs

Estimates from the published token rates above — real turns vary with tool calls and transcript length.

  • Quick answer2K tokens in, 600 out$0.0003
  • 10-slide deck build60K tokens in, 9K out$0.0052
  • 150-page PDF read200K tokens in, 4K out$0.011

Specs and listed prices from OpenRouter. Actual usage cost depends on the serving provider.

How to use GPT-6 Luna

  1. Select “Try GPT-6 Luna online” to open OpenCraft with this model selected.
  2. Sign in or create an account if prompted.
  3. Type a question or describe a task, then send your message.

To compare answers, start a separate chat with another model and use the same prompt.

GPT-6 Luna capabilities

tool-usevisionreasoning

file, image, text in → text out

What is GPT-6 Luna?

GPT-6 Luna is OpenAI’s September 22, 2026 lightweight model and the lowest-cost option in the GPT-6 family. It takes text and image input, returns text, and has a 1,050,000-token context window with up to 128,000 output tokens. OpenAI positions it for high-volume tasks with a clear goal: summarizing documents, extracting information and answering quick questions.

How much does GPT-6 Luna cost?

OpenAI lists GPT-6 Luna at $0.10 per million input tokens, $0.01 cached and $0.50 output. The table above shows OpenRouter’s recorded rates, which can differ from OpenAI’s direct price. At these rates even a long document read costs a few cents; reasoning effort and tool calls add tokens.

GPT-6 Luna vs GPT-5.6 Luna

Both have the same context window. OpenAI says the GPT-6 models carry forward GPT-6 Astra’s gains in factual accuracy, coding and professional work. GPT-6 Luna is OpenCraft’s default chat model; pick either from the model menu. Compare GPT-5.6 Luna and GPT-6 Luna.

Should I use Luna or Sol?

Start with Luna for summaries, extraction and everyday questions. Switch to GPT-6 Sol for multi-step coding, research or spreadsheets where mistakes are expensive. GPT-6 Luna vs GPT-6 Sol.

Release facts checked September 22, 2026 against OpenAI’s GPT-6 Luna model documentation and GitHub’s launch changelog. For current rates and availability, use the live provider listings.

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