o3

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About this model

o3 is the most capable reasoning model in the o model series, and the first one to offer full tools support for agentic solutions.

Key model capabilities

• Multiple APIs support: o3 is available in Responses API and Chat Completions API with Responses API supporting seamless integration with multiple tools and enhanced transparency with the reasoning summary as part of the model output.
• Reasoning summary: In the Responses API, o3 now supports reasoning summary in its output providing more insights into its thinking process. This enhances the explainability and the effectiveness of the resulting actions and tools that leverage the insights for even better outcomes.
• Multimodality: With enhanced vision analysis capabilities, o3 expands its reasoning capability to process and analyze visual data, extracting valuable insights and generating comprehensive text outputs. This is supported in both Responses API and Chat Completions API.
• Full tools support includes parallel tools calling: o3 is the first reasoning model with full tools support similar to the mainline models including parallel tool calling. Use o3 for the next generation of agentic solutions. This capability is supported in both Responses API and Chat Completions API.