GPT-5.5 Pro (batch)

OpenAI's highest-accuracy reasoning variant from the GPT-5.5 series, optimized for batch processing with a 1M+ token context window.

Strengths

Delivers enhanced reasoning accuracy and complex problem-solving on the frontier tier, built for processing large documents and intricate multi-step tasks in batch mode.

Best for

Batch workflows requiring the highest reasoning capability and accuracy, such as research analysis, code review, and document-heavy reasoning tasks that tolerate higher latency.

Limitations

Optimized for asynchronous batch processing rather than real-time interaction; the newest model in this tier so production track record is limited compared to GPT-5.4 Pro (batch).