AI Model Release Tracker

o4-mini

Released

o4-mini is an AI model released by OpenAI on Wednesday, Apr 16 2025, the same day as o3. Benchmark results (shown below) cover BullshitBench v2.

API pricing

InputWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it.
$1.10
Cached inputA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again.
$0.275
OutputWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one.
$4.40
  • Reasoning or thinking is supported.
USD per 1M tokensEvery price here is for one million tokens. A token is roughly three-quarters of a word, so a million tokens is about 750,000 words of text.Verified August 18, 2026Read from developers.openai.com. Click the check to open the source.

Available from

OpenAI$1.10$4.40200K
USD per 1M tokensEvery price here is for one million tokens. A token is roughly three-quarters of a word, so a million tokens is about 750,000 words of text.Checked October 18, 2026Third-party rates from openrouter.ai, not the lab’s own list price.

Benchmarks

BullshitBench v2Nonsense detection — 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.
8%
#89 of 97

Compare o4-mini with

o4-mini

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Frequently asked questions

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

All OpenAI releases

47 tracked

2022

1 release
GPT-3.5
Nov 30 2022