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OpenAI o-series release timeline

3 versions across 2024 – 2025. Heights show the Artificial Analysis Intelligence Index for each release. The latest is o4-mini.

RELEASE TIMELINE OpenAI o-series OpenAI · 3 versions · 2024 – 2025 23.4o1Dec 2024 30.4o3Apr 2025 25.6o4Apr 2025 INTELLIGENCE INDEX ↑ AI Model Radar aimodelradar.app · Performance: Artificial Analysis
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Vendors
Anthropic Google OpenAI
Model lines
Claude Opus Gemini Flash GPT-5 Gemini Pro Claude Sonnet GPT-4 OpenAI o-series

Versions on this timeline

  • o4-mini 25.6 Released Apr 2025
  • o3 30.4 Released Apr 2025
  • o1 23.4 Released Dec 2024
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