o4-mini
Summary
o4-mini is a proprietary language model from OpenAI, released on 16 Apr 2025. It accepts text and images and generates text, with a 200K-token context window and up to 100K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $1.10 per million input tokens and $4.40 per million output tokens (OpenRouter), across 2 providers we track. OpenAI has deprecated this model.
Fast o-series model for compact reasoning, coding, and tool use
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | OpenAI |
|---|---|
| Release date | 16 Apr 2025 [models.dev] |
| Status | Deprecated [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 200K (200,000 tokens) [models.dev] |
| Max output | 100K tokens [models.dev] |
| Knowledge cutoff | May 2024 [models.dev] |
| Input | Text and images [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
| Structured output | Yes [models.dev] |
o4-mini API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter openai/o4-mini | $1.10 | $4.40 | $0.28 | 200K | OpenRouter, 4 Oct 2026 |
| Vercel AI Gateway openai/o4-mini-fast | $2 | $8 | $0.50 | 200K | models.dev, 4 Oct 2026 |
Frequently asked questions
What is the context window of o4-mini?
o4-mini has a context window of 200,000 tokens (200K) and can generate up to 100,000 tokens in a single response, according to models.dev.
How much does the o4-mini API cost?
o4-mini is listed from $1.10 per million input tokens and $4.40 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.
Is o4-mini open source?
No. o4-mini is a proprietary model; OpenAI has not released its weights. It is available through APIs including OpenRouter, Vercel AI Gateway.
When was o4-mini released?
OpenAI released o4-mini on 16 Apr 2025, according to models.dev.
Which providers offer o4-mini?
We track o4-mini on 2 providers: OpenRouter, Vercel AI Gateway.
Change history
No changes detected since we started tracking this model. We re-check every source daily.