Previewing GPT‑5.6 Sol: a next-generation model
Points and comments are a snapshot, not live.
OpenAI previews GPT-5.6 Sol, a next-generation model with three sizes.
OpenAI announced GPT-5.6 Sol, a new model available in three sizes: Sol, Terra, and Luna. Pricing is per 1M tokens: Sol at $5 input / $30 output, Terra at $2.50 input / $15 output, and Luna at $1 input / $6 output. Cache writes are billed at 1.25x the uncached input rate. OpenAI plans broader availability via ChatGPT, Codex, and the API soon.
The article body mostly consists of ASCII art of stars and the company logo, with minimal substantive text beyond pricing and availability details.
What commenters are saying
Commenters criticize the naming scheme (Sol/Terra/Luna) as derivative and mark the pricing as expensive, especially with cache write billing. Some note that Sol's pricing matches GPT-5.5, while Terra offers half-price comparable performance. There is widespread confusion over why this is called GPT-5.6 rather than GPT-6, with speculation that OpenAI avoids major version bumps to manage expectations. Several commenters contrast the model with Anthropic's unreleased Fable, predicting it will underperform. A minority defend the pricing as reasonable for business use in Europe/USA.