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OpenAI releases GPT-6 Sol and Luna and halves their API prices

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Source: OpenAI: Introducing GPT-6 Sol and Luna

OpenAI released GPT-6 Sol and GPT-6 Luna, trained with methods similar to GPT-6 Astra, and cut their API prices by 50% from the GPT-5.6 versions: Sol to $2 and $10 per million input and output tokens, Luna to $0.10 and $0.50. OpenAI said GPT-6 Sol at its highest effort outperforms Claude Opus 5 at maximum effort on AutomationBench at 9% of the cost per task.

Why it matters

Developers get GPT-6-generation models at half the previous price, nearly three weeks after OpenAI released its top model, GPT-6 Astra.

When
22 Sep 2026
ID
WTA-N-2026-0129
Who
OpenAI

Summary by wheresthe.ai, from OpenAI. Checked against the source on 9 Oct 2026.

Read the original at OpenAI

Source copy: download the page text as saved on 18 Oct 2026 (PDF). Also held by the Internet Archive.

Next stop on this Storyline: Led toOpenAI brings GPT-6 and Intelligent UI to all ChatGPT users

Cite this story

WTA-N-2026-0129: “OpenAI releases GPT-6 Sol and Luna and halves their API prices.” wheresthe.ai, 22 Sep 2026. https://wheresthe.ai/d/openai-gpt-6-sol-luna-release-2026-09/ (source: OpenAI: Introducing GPT-6 Sol and Luna).

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