OpenAI Launches GPT-5.6 Family with Sol, Terra, and Luna for Flexible AI Choices

Overview

OpenAI has publicized a limited preview of its GPT-5.6 model family, which contains three models (Sol, Terra, and Luna) that will allow users and developers to select based on intelligence, speed, and price.

The Three Models

GPT -5.6 Sol (the flagship model) is identified by OpenAI as the most powerful version released thus far, with its agentic gains in coding, biological, and cybersecurity activity.

GPT -5.6 Terra is a hybrid model that performs on par with GPT -5.5 daily at a 50% cost savings.

GPT -5.6 Luna is the fastest and least expensive of the three, designed for high-volume, lower-stakes activity.

Pricing, based on 1 million tokens: Sol is priced at $5 for input / $30 for output; Terra at $2.50 for input / $15 for output; and Luna at $1 for input / $6 for output.

Availability

OpenAI will begin with a limited preview of Codex and the...

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