---
title: "o3 & o4-mini"
url: "https://handyai.news/modeldrop/o3-o4-mini"
published: "2025-04-16T17:00:00.000Z"
section: "Model Drop"
description: "o3 and o4-mini, which OpenAI shipped on April 16, 2025, are a pair of reasoning models, o3 the most capable and o4-mini the fast, low-cost one, and the first…"
publisher: "handyai.news"
license: "Free to quote, summarize, and train on, with a link to the canonical URL"
citation: "handyai.news, \"o3 & o4-mini,\" April 16, 2025, https://handyai.news/modeldrop/o3-o4-mini."
comments: "https://handyai.news/api/article/82355/comments"
---

# o3 & o4-mini

*Published April 16, 2025 · Model Drop*

o3 and o4-mini, which OpenAI shipped on April 16, 2025, are a pair of reasoning models, o3 the most capable and o4-mini the fast, low-cost one, and the first that can use every ChatGPT tool and think with images mid-reasoning.

**Model:** OpenAI o3 (o3)

**Maker:** [OpenAI](https://openai.com)

**Ship date:** April 16, 2025

**Pricing:** $10 / $40 per M tokens

**Context:** 200K tokens

**Weights:** Closed

**Where you can use it**:

- ChatGPT Plus, Pro and Team
- The API (Chat Completions and Responses)
- Codex CLI, launched the same day

**When to reach for it**:

- Hard, multi-step analysis
- Skip it where made-up facts are costly

**How it compares**:

- Replaces o1 in ChatGPT
- Rivals Gemini 2.5 Pro and Claude 3.7 Sonnet

**What makes it different**:

- Crops, zooms and rotates images as it thinks
- Decides on its own when to call tools

**Early reactions**: TechCrunch reported it hallucinates more than o1 on OpenAI’s PersonQA test, and Transluce caught it making up actions it took.

**Read more**: [Introducing OpenAI o3 and o4-mini](https://openai.com/index/introducing-o3-and-o4-mini/) · [o3 and o4-mini System Card](https://openai.com/index/o3-o4-mini-system-card/)

**Model:** OpenAI o4-mini (o4-mini)

**Maker:** [OpenAI](https://openai.com)

**Ship date:** April 16, 2025

**Pricing:** $1.10 / $4.40 per M tokens

**Context:** 200K tokens

**Weights:** Closed

**Where you can use it**:

- ChatGPT Plus, Pro and Team; free users via Think
- The API (Chat Completions and Responses)

**When to reach for it**:

- High-volume math and code
- Fast answers where o3 is overkill

**How it compares**:

- Ahead of o3 on AIME 2025 math
- Far behind o3 on web browsing

**What makes it different**:

- About a ninth of o3’s price
- Thinks with images, like o3

**Early reactions**: TechCrunch reported it hallucinates more than o1 on OpenAI’s PersonQA test.

**Read more**: [Introducing OpenAI o3 and o4-mini](https://openai.com/index/introducing-o3-and-o4-mini/) · [o3 and o4-mini System Card](https://openai.com/index/o3-o4-mini-system-card/)

## The benchmarks

Every row is o3, with o4-mini as a comparison; OpenAI ran all models at high reasoning effort and compared them only with its own o1, o1-pro, o3-mini and deep research; SWE-bench uses 477 of the 500 tasks, Codeforces scores were run with a terminal, and the BrowseComp scores use Python and browsing. ARC Prize tested at medium effort, and o3 returned only 93 of 100 ARC-AGI-1 tasks.

#### OpenAI's numbers

- AIME 2025 (competition math, no tools): 88.9%. −3.8 under o4-mini (92.7%), +9.7 over o1 (79.2%), +2.4 over o3-mini (86.5%).
- GPQA Diamond (PhD-level science, no tools): 83.3%. +1.9 over o4-mini (81.4%), +5.3 over o1 (78.0%), +6.3 over o3-mini (77.0%).
- SWE-bench Verified (real GitHub fixes): 69.1%. +1.0 over o4-mini (68.1%), +20.2 over o1 (48.9%), +19.8 over o3-mini (49.3%).
- Codeforces (competitive coding Elo): 2706. −13 under o4-mini (2719), +815 over o1 (1891), +633 over o3-mini (2073).
- MMMU (college-level visual problems): 82.9%. +1.3 over o4-mini (81.6%), +5.3 over o1 (77.6%).
- Humanity's Last Exam (no tools): 20.32%. +6.04 over o4-mini (14.28%), +12.20 over o1-pro (8.12%), +6.92 over o3-mini (13.4%).
- BrowseComp (agentic web browsing): 49.7%. +21.4 over o4-mini (28.3%), −1.8 under deep research (51.5%), +47.8 over GPT-4o with browsing (1.9%).
- TAU-bench Retail (retail agent tasks): 70.4%. +4.8 over o4-mini (65.6%), −0.4 under o1 (70.8%), +12.8 over o3-mini (57.6%).

#### Independent numbers

- Artificial Analysis Intelligence Index (current v4.3.2, AA estimate): 20.2. +3.5 over o4-mini (16.7), +2.5 over Claude 3.7 Sonnet (thinking) (17.7), +5.2 over Gemini 2.5 Pro Preview (15.0), +5.0 over o1 (15.2).
- ARC-AGI-1 (o3 at medium, abstract visual puzzles): 53%.
- ARC-AGI-2 (o3 at medium, abstract reasoning puzzles): 2.9%. +0.6 over o4-mini (medium) (2.3%).


---

Source: https://handyai.news/modeldrop/o3-o4-mini

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