o3 (batch)

OpenAI's frontier reasoning model with 200k token context, optimized for batch processing of complex problems requiring extended chain-of-thought reasoning.

Strengths

Delivers high-quality reasoning and problem-solving through reinforcement learning-trained chain-of-thought processing, with strong performance on complex analytical tasks.

Best for

Batch workloads involving complex reasoning, research tasks, and technical problem-solving where quality output justifies the processing time.

Limitations

Slower inference than standard models due to extended reasoning; newer o4-mini offers more cost-efficient reasoning for simpler tasks, and o3-pro has since been introduced as a complementary tier.