From the source

Introducing GPT-6 Sol and Luna

GPT-6 Sol and Luna API prices cut 50% with improved cost efficiency.

OpenAI announced GPT-6 Sol and GPT-6 Luna, two new models in the GPT-6 family that offer improved cost efficiency while bringing advances from GPT-6 Astra to professional work, factuality, coding, and alignment.

API prices for Sol and Luna are reduced by 50% compared to their GPT-5.6 promotional pricing.

The models outperform similarly priced competitors on benchmarks such as AutomationBench, Agents' Last Exam, FrontierCode, and DeepSWE at lower cost per task.

From the source
We trained GPT‑6 Sol and Luna with similar methods as GPT‑6 Astra, bringing the advances behind Astra’s state-of-the-art performance in professional work, factuality, coding, computer use, and alignment to faster, more affordable models.
openai.com

OpenAIAnnouncement
Please welcome GPT-6 Sol and GPT-6 Luna to the GPT-6 universe.
GPT-6 Sol and Luna build on the advances behind GPT-6 Astra, bringing much of its strengths into faster and more affordable models to support work at scale.
We’ve also made caching and inference more efficient, and we’re passing the savings directly to you: 50% lower API prices for Sol and Luna compared with GPT‑5.6 promotional pricing.

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Introducing GPT-6 Sol and Luna

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