GPT-6 Sol and Astra compared on price, speed, and output structure
The article compares GPT-6 Sol and Astra, two models in OpenAI's GPT-6 series released on September 22, 2026, alongside Luna. Astra costs five times more than Sol per million tokens: $10 input/$50 output versus Sol's $2 input/$10 output. Third-party measurements from Artificial Analysis show Sol is more than twice as fast in output speed (116 vs 52 tokens/sec) and has a shorter time to first…
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Key points from the news
- Astra costs 5x more than Sol: $10 input/$50 output vs $2 input/$10 output per 1M tokens
- Sol is over twice as fast as Astra: 116 vs 52 tokens/sec output speed, 136 vs 352 sec first response
- In short tests, Astra output was ~1.3x longer with added structure; Sol was more concise
Model pages: GPT-6 Sol → · GPT-6 (Astra) → · GPT-6 Luna →
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GPT-6 Sol vs. Astra: Which One Should You Use?
note.com · 25 September 2026
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