TL;DR
On September 22, 2026 (US time), OpenAI launched two new GPT-6 models, GPT-6 Sol and GPT-6 Luna, with API prices permanently cut 50% versus GPT-5.6: Sol at $2 input / $10 output per million tokens and Luna at $0.10 / $0.50.
Event overview
On September 22, 2026, OpenAI released two new GPT-6 family models: GPT-6 Sol and GPT-6 Luna. Per OpenAI's official announcement (as reported by 36Kr), the API prices are 50% lower than GPT-5.6's promotional prices, and OpenAI says the new prices are permanent, not a limited-time discount. The same day, Anthropic released Claude Opus 5.5, with both companies announcing price changes nearly simultaneously.
Key facts
- Event: GPT-6 Sol and GPT-6 Luna launch (OpenAI official Introducing GPT-6 Sol and Luna).
- Date: September 22, 2026 (US time).
- Sol pricing: $2 input / $10 output per million tokens (GPT-5.6 Sol was $4 / $20, a 50% cut).
- Luna pricing: $0.10 input / $0.50 output per million tokens (GPT-5.6 Luna was $0.20 / $1.20, a 50% cut).
- Pricing nature: OpenAI says the new prices are long-term, not promotional.
- Luna specs: 1.05M context length and 128K max output tokens (per OpenAI's platform).
- Industry context: Anthropic released Claude Opus 5.5 the same day and cut its input price (per TMTPost).
Official sources
- OpenAI official platform pricing: openai.com/api/pricing
- 36Kr (September 23, 2026): GPT-6 Sol/Luna: permanent 50% price cut