Introducing OpenAI o3 and o4-mini

What changed

Our smartest and most capable models to date with full tool access

Why it matters

A concrete addition to Practical AI: Tools, Models & Frameworks: it changes what's available to builders today rather than being general commentary.

How it compares

Related prior coverage to compare against:

• Addendum to OpenAI o3 and o4-mini system card: OpenAI o3 Operator
• OpenAI o3-mini System Card
• Retiring GPT-4o, GPT-4.1, GPT-4.1 mini, and OpenAI o4-mini in ChatGPT

• Addendum to OpenAI o3 and o4-mini system card: OpenAI o3 Operator similarity 0.32
• OpenAI o3-mini System Card similarity 0.30
• Retiring GPT-4o, GPT-4.1, GPT-4.1 mini, and OpenAI o4-mini in ChatGPT similarity 0.28