GPT-5.6 Sol (batch)

OpenAI's flagship reasoning model in the GPT-5.6 series, available in batch mode with a 1.05M token context window.

Strengths

Excels at complex reasoning, multi-step coding tasks, and command-line workflows; handles the largest context window in its tier.

Best for

Batch processing of long-context documents and complex reasoning problems that don't require real-time latency.

Limitations

Batch mode introduces latency compared to real-time inference; for higher-quality reasoning output, GPT-5.6 Sol Pro offers a dedicated reasoning mode.