Input
$0.75
Output
$4.50
Context
400K
GPT-5.4 Mini costs $0.75 per million input tokens and $4.50 per million output tokens. Cached input is billed at $0.075 per million, 90% less than fresh input.
Specifications
| Lab | OpenAI |
| Model id | openai/gpt-5.4-mini |
| Input price | $0.75 per million tokens |
| Output price | $4.50 per million tokens |
| Cached input price | $0.075 per million tokens |
| Context window | 400,000 tokens (400K) |
| Maximum output | 128,000 tokens (128K) |
| Tool calling | yes |
| Image input | yes |
| Reasoning | no |
| First listed | 17 March 2026 |
Models it replaced
The feeds list GPT-5.4 Mini in place of openai/gpt-4.1-mini, openai/gpt-4o-mini, openai/gpt-4o-mini-2024-07-18, openai/gpt-5-mini. Those models' own prices and limits were different; an article that names one of them describes the model it was written about.
OpenAI's other models
| Model | Input / 1M | Output / 1M | Context | Listed |
|---|---|---|---|---|
| GPT-6.1 Terra | $1 | $5 | 1.05M | 26 October 2026 |
| GPT-6.1 Terra Pro | $1 | $5 | 1.05M | 26 October 2026 |
| GPT-6.1 Sol | $2 | $10 | 1.05M | 29 September 2026 |
| GPT-6.1 Sol Pro | $2 | $10 | 1.05M | 29 September 2026 |
| GPT-6 Luna | $0.10 | $0.50 | 1.05M | 22 September 2026 |
| GPT-6 Luna Pro | $0.10 | $0.50 | 1.05M | 22 September 2026 |
| GPT-6 Sol Pro | $2 | $10 | 1.05M | 22 September 2026 |
| GPT-6 Astra | $10 | $50 | 1.05M | 4 September 2026 |
| GPT-6 Astra Pro | $10 | $50 | 1.05M | 4 September 2026 |
| GPT-5.6 Luna | $0.20 | $1.20 | 1.05M | 9 July 2026 |
| GPT-5.6 Luna Pro | $0.20 | $1.20 | 1.05M | 9 July 2026 |
| GPT-5.6 Sol Pro | $4 | $20 | 1.05M | 9 July 2026 |
Where these numbers come from
Read from OpenRouter's listing of GPT-5.4 Mini every 6 hours into the catalog Founden's builders choose their models from. Prices are OpenRouter's listed price per million tokens: for a lab's closed models that is the lab's own list price, and for an open-weight model it is the price of the host OpenRouter routes to by default, which can differ from the lab's own API and from other hosts. US dollars, before batch, volume or regional discounts. Every model.