128k OpenAI Context Window
Process massive documents with OpenAI GPT 5 mini. The 128,000 token window allows for deep RAG applications and long-form content analysis without losing track of details.
gpt-5-mini / image-to-text
OpenAI GPT 5 mini delivers GPT-4 class intelligence with sub-second latency. This cost-efficient model supports multimodal inputs and 128k context, making it ideal for high-volume production apps requiring OpenAI precision and speed.
$ 0.175
$ 0.25
image
$ 1.4
$ 2
text
API
Image To Text (Response)
curl --request POST "https://gptproto.com/v1/responses" \
--header "Authorization: Bearer $GPTPROTO_API_KEY" \
--header "Content-Type: application/json" \
--data '{
"model": "gpt-5-mini",
"input": [
{
"role": "user",
"content": [
{
"type": "input_text",
"text": "What is in this image?"
},
{
"type": "input_image",
"image_url": "https://tos.gptproto.com/resource/cat.png"
}
]
}
]
}'Image To Text (Chat)
curl --request POST "https://gptproto.com/v1/chat/completions" \
--header "Authorization: Bearer $GPTPROTO_API_KEY" \
--header "Content-Type: application/json" \
--data '{
"model": "gpt-5-mini",
"messages": [
{
"role": "user",
"content": [
{
"type": "text",
"text": "What is in this image?"
},
{
"type": "image_url",
"image_url": {
"url": "https://tos.gptproto.com/resource/cat.png"
}
}
]
}
],
"max_tokens": 300
}'Key OpenAI GPT 5 Mini Features
Discover the technical strengths that make OpenAI GPT 5 mini a leader in cost-efficient AI.
Precise OpenAI JSON Mode
Achieve 100% reliability in structured outputs. OpenAI GPT 5 mini uses constrained decoding to match your schemas perfectly, which is essential for automated data pipelines.
Cost-Effective OpenAI Power
Reduce overhead with $0.15 per million tokens. OpenAI GPT 5 mini provides frontier-level intelligence at a fraction of the cost of larger models, maximizing your ROI.
Sub-second OpenAI Latency
Experience Time To First Token under 200ms. OpenAI GPT 5 mini is built for real-time chat and interactive apps where every millisecond counts for the user experience.
How to Get a gpt-5-mini API Key
Getting a gpt-5-mini API key takes four steps and a few minutes. Create a free GPTProto account, add credits, generate your key, and make your first call — at $0.175 / $1.4 it's a cheaper gpt-5-mini API key than going direct, and one key works across every model on the platform. Full gpt-5-mini Documentation is in the docs.
Sign up
Create your free GPT Proto account to begin. You can set up an organization for your team at any time.
Top up
Your balance can be used across all models on the platform, including gpt-5-mini, giving you the flexibility to experiment and scale as needed.
Generate your API key
In your dashboard, create an API key — you'll need it to authenticate when making requests to gpt-5-mini.
Make your first API call
Use your API key with our sample code to send a request to gpt-5-mini via GPT Proto and see instant AI-powered results.
OpenAI GPT 5 Mini Common Questions
Find expert answers about OpenAI GPT 5 mini performance, pricing, and integration steps.
How does OpenAI GPT 5 mini compare to GPT-4o?
OpenAI GPT 5 mini provides reasoning similar to GPT-4o but at a significantly lower price point and with much faster response times. While OpenAI designed it to be smaller, it retains high performance in MMLU and coding benchmarks. It is specifically optimized for high-volume tasks where speed is critical, whereas GPT-4o remains the choice for the most complex, deep reasoning discovery projects.
Can OpenAI GPT 5 mini handle multimodal inputs?
Yes, OpenAI GPT 5 mini is natively multimodal. This means the OpenAI model processes vision and audio tokens directly rather than using external adapters. This results in better spatial reasoning for images and more accurate emotional detection in audio. You can send images or audio files to the OpenAI GPT 5 mini API and receive structured JSON or text outputs based on that input data seamlessly.
What is the pricing for OpenAI GPT 5 mini?
OpenAI GPT 5 mini is priced for efficiency at $0.15 per 1M input tokens and $0.60 per 1M output tokens. On our platform, you can further reduce costs with a 50% discount on cached input tokens. This makes the OpenAI model one of the most cost-effective options for developers running large-scale agentic workflows or real-time support bots that require constant OpenAI API interaction.
Is OpenAI GPT 5 mini suitable for coding?
Absolutely. OpenAI GPT 5 mini scores 88.4% on HumanEval, making it highly capable for unit test generation, real-time code completion, and documentation. It handles intermediate coding tasks with ease. Developers often use this OpenAI model within IDEs because its sub-second latency ensures the coding flow isn't interrupted. It is a powerful OpenAI tool for automating repetitive software development lifecycles.
How do I migrate to OpenAI GPT 5 mini?
Migrating to OpenAI GPT 5 mini is simple. If you are already using the OpenAI SDK, just update the model parameter string to gpt-5-mini. The API is backward compatible with existing OpenAI patterns, including function calling and structured outputs. Using our aggregation platform, you can switch the model name in your configuration and immediately benefit from the improved speed and lower costs of GPT 5.
Does OpenAI use my data for training?
No. When you access OpenAI GPT 5 mini through GPTProto, your data is protected. OpenAI does not use data submitted via their API to train their models. We provide an additional layer of privacy and security, ensuring that your proprietary information and user queries remain confidential while still leveraging the cutting-edge intelligence of the OpenAI GPT 5 mini model for your production needs.
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