# GPT-5.6 Sol, Terra and Luna

_Release #037, July 10, 2026. Agent smarts_

OpenAI's newest model family is now available in the model picker, three models spanning peak reasoning to fast, affordable runs.

- **GPT-5.6 Sol, Terra & Luna.** OpenAI's latest model family is now available in the model picker for all workspaces. Sol sits at the top of the lineup for maximum reasoning depth, Terra offers a strong balance of capability and cost, and Luna is the fastest and most affordable of the three. All three are marked Beta while OpenAI finalises the release.

Source: https://viktor.com/changelog/2026-07-10-gpt-5-6-sol-terra-luna