With the release of GPT-5.6, developers face a new challenge: choosing between Luna, Terra, and Sol model variants. Each variant is optimized for different use cases: Luna for speed and low latency, Terra for balanced performance and cost, and Sol for maximum reasoning capability. This guide breaks down the key differences in terms of API pricing, response time, and suitability for tasks like chat, code generation, and complex reasoning. Understanding these trade-offs is essential for optimizing both performance and cost in production applications. The article also provides practical tips for switching between variants based on workload demands.
A practical guide to choosing between GPT-5.6 model variants for your API calls.