GPT-5.6 Luna
GPT-5.6 model optimized for cost-sensitive, high-volume workloads. Same massive context at 1/5 the cost of Sol.
Best for
High-volume coding, automated pipelines, cost-efficient development
Strengths
Most cost-efficient GPT-5.6 variant at $1/$6 per MTok
Same 1.05M context and 128K output as Sol and Terra
Full reasoning support with adjustable effort
Ideal for automated pipelines and batch processing
When to use
Choose GPT-5.6 Luna for high-volume workloads where cost efficiency matters — CI/CD pipelines, batch code generation, automated testing, and tasks where you're making many API calls. Same huge context window as the rest of the family.
Limitations
Optimized for cost over raw capability. For the most complex reasoning or critical one-shot decisions, Terra or Sol provide higher quality.
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