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OpenAI

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 · AI MODEL RADAR OpenAI o-series OpenAI · 3 versions · 2024 – 20259182837 23.9o1Dec 2024 31.1o3Apr 2025 26.1o4Apr 2025 aimodelradar.app · Intelligence Index: Artificial Analysis
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🏁 The AI frontier
Vendors
Anthropic Google OpenAI
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Claude Opus Gemini Flash Claude Sonnet GPT-5 Gemini Pro Claude Haiku GPT-4 OpenAI o-series

Versions on this timeline

  • o4-mini 26.1 Released Apr 2025
  • o3 31.1 Released Apr 2025
  • o1 23.9 Released Dec 2024
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