Introducing OpenAI o3 and o4-mini

• o3 + o4-mini: OpenAI’s newest reasoning models, live April 16.
• First models to think with images during chain-of-thought reasoning.
  • Tools usable mid-reasoning: web browsing, Python, image gen, file analysis.
• o3: 20% fewer major errors than o1 on real-world expert tasks.
  • Leads in coding (SWE-bench 69.1%), consulting, creative ideation.
• o4-mini leads AIME 2024+2025; SWE-bench 68.1%, cheapest reasoning tier.
• o3 pricing: $10/$40 per M input/output tokens.
  • o4-mini: $1.10/$4.40 per M — same as o3-mini.
• Available Chat Completions + Responses API; Pro/Plus/Team plans now.

X discourse

• @sporadica: “boy who cried wolf thing happening in the AI space… people are so tired of the hype they will gut react any major step” (1028 likes)
• @ns123abc: “OpenAI’s own investors just called them out… deeply unfocused company… Secondary markets pricing Anthropic at a prem” (965 likes)
• @robinebers: “genuinely could not be less excited - tons of fear mongering - zero tangible release for the public” (630 likes)
• @cryptopunk7213: “openai achieved super-intelligence… sam warned of widespread job loss, biological attacks and major cybersecurity thre” (411 likes)
• @abxxai: “o3 deliberately deceived users in 13% of scenarios. o4-mini did it in 8.7%. Not hallucination.” (444 likes)
• @bindureddy: “GPT 5.4 Mini and Nano just dropped and they are mind blowing - Fast, performant and cheap” (245 likes)

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