# o4-mini

o4-mini is an AI model released by OpenAI on Apr 16 2025. At release it scored 8% on BullshitBench v2.

## Facts

| Field | Value |
| --- | --- |
| Model | o4-mini |
| Developer | OpenAI |
| Release date | Wednesday, Apr 16 2025 |
| Licensing | Proprietary |

## API pricing

All rates in USD per 1,000,000 tokens, pay-as-you-go.

| Tier | Input | Cached input | Output |
| --- | --- | --- | --- |
| All documented contexts | $1.10 | $0.275 | $4.40 |

Verified August 18, 2026 against the first-party source: https://developers.openai.com/api/docs/models/o4-mini

## Benchmark scores published at release

| Benchmark | Score | Source | What it measures |
| --- | --- | --- | --- |
| BullshitBench v2 | 8% | Lab | Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. |

## Questions and answers

### When was o4-mini released?

o4-mini was released by OpenAI on Wednesday, Apr 16 2025.

### Who made o4-mini?

o4-mini was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.

### How much does o4-mini cost?

o4-mini costs $1.10 per million input tokens and $4.40 per million output tokens through the OpenAI API. Cached input is $0.275 per million tokens. Rates are pay-as-you-go API prices verified against OpenAI's published pricing on August 18, 2026.

### What benchmark scores did o4-mini get?

o4-mini reports 1 tracked benchmark score — BullshitBench v2: 8%. Scores are the figures published at release by OpenAI.

### Is o4-mini open source?

No. o4-mini is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

### What came before and after o4-mini?

OpenAI's previous tracked release was o3 on Apr 16 2025. It was followed by o4-mini-high on Apr 16 2025.


---

Canonical page: https://aireleasetracker.com/model/openai/o4-mini
Full dataset: https://aireleasetracker.com/llms-full.txt · JSON: https://aireleasetracker.com/models.json
Source: AI Release Tracker (https://aireleasetracker.com). Benchmark scores are the figures published by the releasing lab at launch.