OpenAI launches GPT-6 Sol and Luna at half the price of 5.6

OpenAI expanded its GPT-6 generation with updated Sol and Luna models, cutting API pricing to half that of the 5.6 series thanks to caching and inference gains. Sol makes about half as many factual errors as its predecessor, while Luna targets high-volume tasks like summarization and data extraction.

• API access to GPT-6 Sol and Luna costs half as much as the 5.6 series
• GPT-6 Sol makes roughly half as many mistakes as its predecessor
• Sol is available in ChatGPT Work, Codex and API; Luna also reaches free users
• Anthropic released Opus 5.5 just 90 minutes before OpenAI's launch