O1

Overview

O1 introduced OpenAI’s reasoning-first o-series, focusing on deliberate, step-by-step problem solving rather than quick chat responses. It is best used for complex analytical tasks, multi-step planning, and rigorous technical reasoning where accuracy matters more than speed. O1 also supports tool use and visual inputs, which makes it suitable for deep analysis that combines text, data, and diagrams.

Capabilities

• Deliberative reasoning for complex, multi-step analysis
• Tool and function calling for calculations and automation
• Vision inputs for charts, screenshots, and diagrams
• Structured outputs for predictable response formats

Strengths

• Strong analytical reasoning and stepwise explanations
• Reliable for complex technical problem solving
• Good at synthesizing long, structured inputs
• Useful for agentic workflows requiring careful planning

Limitations and Considerations

• Slower and more expensive than non-reasoning models
• Overkill for simple chat, summarization, or classification
• Requires clear prompts to avoid unnecessary reasoning depth

Best Use Cases

O1 excels in:

• Complex analytical reports
• Multi-step problem solving
• Visual content analysis with reasoning
• Research and investigation tasks
• Decision support systems