GPT-5.6 Terra (batch)

GPT-5.6 Terra is a midrange model in OpenAI's GPT-5.6 series that balances capability and efficiency, positioned between the flagship Sol reasoning model and the lightweight Luna variant.

Strengths

Handles everyday coding, reasoning, and agentic workflows with broad capability across general tasks without the overhead of a flagship model.

Best for

General-purpose coding, multi-turn reasoning, and agent-based applications where capability and throughput need to coexist.

Limitations

Not specialized for extreme reasoning tasks like Sol, nor optimized for speed and efficiency to the degree Luna is; requires careful prompt design for tasks demanding maximum accuracy.