OpenAI launches GPT-6 Sol and Luna, boasting lower cost and fewer mistakes | TechCrunch
Short summary
OpenAI launched updated versions of its Sol and Luna models, cutting API prices in half compared to the previous generation while claiming significant improvements in accuracy and coding performance. The release comes just 90 minutes after Anthropic released its own competing model update.
- API pricing for GPT-6 Sol and Luna is half the cost of the 5.6 series, attributed to improvements in caching and inference efficiency
- GPT-6 Sol reportedly makes about half as many factual mistakes as its predecessor, matching the reliability of the flagship Astra model at lower cost
- Sol handles complex tasks like coding while Luna targets high-volume clerical work like document summarization and information extraction
Full summary
OpenAI rolled out updated versions of its GPT-6 Sol and Luna models, the smaller siblings to the flagship GPT-6 Astra that launched earlier this month. Sol handles complex work like coding, while Luna tackles high-volume clerical tasks—document summarization, data extraction, that kind of thing. Both are now half the price of their GPT-5.6 predecessors, which OpenAI credits to improvements in caching and inference speed.
The real selling point here is the performance gains. According to OpenAI's internal testing on real user conversations, GPT-6 Sol cuts error rates in half compared to its predecessor and matches Astra's reliability at a much lower cost. The company also claims better factual accuracy across the board and fewer coding mistakes. As always, OpenAI threw in the competitive jabs—saying both models substantially outperform Anthropic's top offerings like Fable and Opus. The timing is worth noting: Anthropic released Opus 5.5 just 90 minutes before this announcement, which tells you how tight the race is.
Sol and Luna are available now through ChatGPT Work, Codex for paid users, and the API. Luna will roll out to the desktop app and free/Go tier users. ChatGPT itself is getting the models gradually throughout the day. The pricing cut and reliability bump make this more of a practical consolidation than a flashy breakthrough—OpenAI's essentially making its mid-tier models cheaper and more reliable, which matters more for actual users than another "world's best" claim.