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OpenAI launches GPT-6 Sol and Luna with API prices cut in half

TechgainAuthor

6 min read · 23 September 2026

OpenAI released GPT-6 Sol and GPT-6 Luna on September 22, cutting API prices to half the outgoing GPT-5.6 rates and saying the smaller new models make about half as many factual mistakes.

The short version

GPT-6 Sol costs $2 per million input tokens and $10 per million output
GPT-6 Luna drops to $0.10 input and $0.50 output per million tokens
OpenAI calls the new rates permanent, not a promotion
Luna reaches Free and Go users in the ChatGPT desktop app
Anthropic shipped Claude Opus 5.5 ninety minutes earlier

Sources (5)

openai.com/index/introducing-gpt-6-sol-and-luna
techcrunch.com/2026/09/22/openai-launches-gpt-6-sol-and-luna
venturebeat.com/technology/openai-releases-gpt-6-sol-and-luna-models-slashing-api-costs-50-or-more
thenextweb.com/news/openai-gpt-6-sol-luna-api-price-cut
the-decoder.com/openais-gpt-6-sol-and-luna-cut-prices-in-half-but-barely-move-the-needle-on-performance

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OpenAI launches GPT-6 Sol and Luna with API prices cut in half

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