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OpenAI · o-series

o3

OpenAI's mainstream reasoning model - production-viable thinking.

The O3 model is part of OpenAI's o-series lineup, designed as a flagship multimodal AI tool to serve a wide range of applications, including text, image, and file processing. Released in 2023, O3 is notable for its ability to manage extensive context and integrate multiple data types, making it a powerful resource for developers and product teams aiming to tackle complex workflows and creative tasks.

A technical highlight of the O3 model is its 200,000-token context window, enabling the management of large-scale datasets and maintaining coherence over extended sequences. Its multimodal capabilities empower simultaneous text, image, and file input processing, underscoring its versatility for handling varied and nuanced tasks in both creative and analytical domains.

O3 is positioned as the flagship model within OpenAI's o-series, building upon the strengths of its predecessors by significantly expanding the context window and enhancing multimodal functionalities. These advancements make it particularly suited for complex, large-scale tasks requiring extensive data integration and contextual depth.

Specs

Context window
200K tokens
Max output
100K tokens
Input ($/1M tokens)
$2.00
Output ($/1M tokens)
$8.00
Modalities
Image · Text · File
Released
Apr 16, 2025
Weights
Closed

Pricing last synced Apr 27, 2026 via OpenRouter. Confirm against official docs before committing.

Capabilities

  • Tool use
  • Vision
  • Extended thinking
  • Prompt caching
  • Open weights

What it excels at

  • 200,000-token context window

    Processes large text sequences while maintaining contextual coherence.

  • Multimodal processing

    Integrates text, image, and file inputs seamlessly for cohesive outputs.

  • Complex reasoning capabilities

    Handles intricate workflows and large datasets with nuanced understanding.

When to use this model

  • →Document analysis and summarization - Handles lengthy documents efficiently with its large context window.
  • →Multimodal content creation - Combines text and images to generate integrated outputs for creative tasks.
  • →Research and data synthesis - Processes varied inputs to provide comprehensive, contextually-aware results.
  • →Long-form content generation - Excels at crafting coherent narratives over extended sequences.

Analysis synthesized from gpt-4o, llama-4-maverick, phi-4, etc.

API model id

o3

Vendor docs: platform.openai.com/docs

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