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Wednesday, September 23, 2026

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OpenAI · Wednesday, September 23, 2026

OpenAI adds GPT-6 Sol and Luna at half prior promotional API prices

The File desk · Sep 23, 2026, 10:29 AM UTC

Status

Confirmed (OpenAI launch post + news index dated Sept. 22, 2026)

OpenAI’s news index dated the product post Sept. 22, 2026. The company introduced GPT-6 Sol and GPT-6 Luna as cheaper, faster companions to GPT-6 Astra, trained with similar methods. Application programming interface (API) IDs are gpt-6-sol and gpt-6-luna. Short-context API prices fall 50% from GPT-5.6 promotional rates: Sol from $4/$20 to $2/$10 per million input/output tokens; Luna from $0.20/$1.20 to $0.10/$0.50. OpenAI says Sol targets complex coding and agent work; Luna targets cheaper high-volume use. Availability includes ChatGPT Work and Codex for Plus, Pro, Business, Enterprise, and Edu plans; Free and Go can use Luna in the desktop app; Chat rollout is gradual.

OpenAI’s news index dated the product post Sept. 22, 2026.

The company introduced GPT-6 Sol and GPT-6 Luna as cheaper, faster companions to GPT-6 Astra, trained with similar methods.

The application programming interface (API) IDs are gpt-6-sol and gpt-6-luna.

Short-context API prices fall 50% from GPT-5.6 promotional rates.

Sol moves from $4/$20 to $2/$10 per million input/output tokens. Luna moves from $0.20/$1.20 to $0.10/$0.50.

OpenAI says Sol targets complex coding and agent work. Luna targets cheaper high-volume use.

Availability includes ChatGPT Work and Codex for Plus, Pro, Business, Enterprise, and Edu plans.

Free and Go can use Luna in the desktop app. Chat rollout is gradual.

What is still unknown or disputed

Primary sources

Every claim in this story is drawn from the documents below. If a fetch failed, that is recorded on the card.

  1. Source 1

    Introducing GPT-6 Sol and Luna

    OpenAI · September 22, 2026

    That’s why we’re expanding the GPT-6 universe with GPT-6 Sol and GPT-6 Luna. … reducing API prices for Sol and Luna by 50% compared with their GPT-5.6 promotional pricing.

    https://openai.com/index/introducing-gpt-6-sol-and-luna/

  2. Source 2

    OpenAI News — Introducing GPT-6 Sol and Luna

    OpenAI · September 22, 2026

    Product Sep 22, 2026 Introducing GPT-6 Sol and Luna (publicationDate 2026-09-22T18:00:00Z)

    https://openai.com/news