When was o4-mini released?

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

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.

o4-mini

Released Apr 16 2025

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

Input: $1.10
Cached input: $0.275
Output: $4.40

Reasoning or thinking is supported.

USD per 1M tokens

Benchmarks

BullshitBench v2

#74 of 77

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Frequently asked questions

: o4-mini was released by OpenAI on Wednesday, Apr 16 2025.
: o4-mini was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.
: 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.
: o4-mini reports 1 tracked benchmark score — BullshitBench v2: 8%. Scores are the figures published at release by OpenAI.
: 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.
: OpenAI's previous tracked release was o3 on Apr 16 2025. It was followed by o4-mini-high on Apr 16 2025.