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announced December 2024
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Official OpenAI announcement for o3 and o4-mini models; relevant to AI safety discussions around rapidly advancing frontier model capabilities, inference-time compute scaling, and deployment of increasingly powerful agentic systems.
Metadata
Importance: 62/100press releaseprimary source
Summary
OpenAI's announcement of their o3 and o4-mini reasoning models, representing significant capability advances in chain-of-thought reasoning, coding, mathematics, and agentic tasks. These models build on the 'o-series' reasoning approach and demonstrate substantially improved performance on challenging benchmarks.
Key Points
- •o3 and o4-mini are advanced reasoning models using extended chain-of-thought processing before responding
- •Models show strong performance on math, science, coding, and visual reasoning benchmarks
- •o4-mini offers a cost-efficient alternative with competitive performance on reasoning-intensive tasks
- •Models support tool use including web search and code execution in agentic settings
- •Release continues OpenAI's scaling of inference-time compute as a path to capability improvements
Cited by 5 pages
| Page | Type | Quality |
|---|---|---|
| Large Language Models | Concept | 62.0 |
| Reasoning and Planning | Capability | 65.0 |
| Self-Improvement and Recursive Enhancement | Capability | 69.0 |
| Is Scaling All You Need? | Crux | 42.0 |
| Emergent Capabilities | Risk | 61.0 |
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Introducing OpenAI o3 and o4-mini | OpenAI
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Table of contents
What’s changed
Continuing to scale reinforcement learning
Thinking with images
Toward agentic tool use
Safety
Codex CLI: frontier reasoning in the terminal
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What's next
Livestream replay
April 16, 2025
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Introducing OpenAI o3 and o4-mini
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Update on June 10, 2025: OpenAI o3‑pro is now available to Pro users in ChatGPT, as well as in our API. Like OpenAI o1‑pro, o3‑pro is a version of our most intelligent model, OpenAI o3, designed to think longer and provide the most reliable responses. Full details can be found in our release notes(opens in a new window).
Today, we’re releasing OpenAI o3 and o4-mini, the latest in our o-series of models trained to think for longer before responding. These are the smartest models we’ve released to date, representing a step change in ChatGPT's capabilities for everyone from curious users to advanced researchers. For the first time, our reasoning models can agentically use and combine every tool within ChatGPT—this includes searching the web, analyzing uploaded files and other data with Python, reasoning deeply about visual inputs, and even generating images. Critically, these models are trained to reason about when and how to use tools to produce detailed and thoughtful answers in the right output formats, typically in under a minute, to solve more complex problems. This allows them to tackle multi-faceted questions more effectively, a step toward a more agentic ChatGPT that can independently execute tasks on your behalf. The combined power of state-of-the-art reasoning with full tool access translates into significantly stronger performance across academic benchmarks and real-world tasks, setting a new standard in both intelligence and usefulness.
What’s changed
OpenAI o3 is our most powerful reasoning model that pushes the frontier across coding, math, science, visual perception, and more. It sets a new SOTA on benchmarks inc
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