Strict Structured Outputs
Native support for JSON mode ensures the chat 4.1 mini adheres 100% to your developer schemas without formatting errors.
gpt-4.1-mini / web-search
The chat 4.1 mini model delivers flagship-tier reasoning at a fraction of the cost. Optimized for speed, this 4.1 mini variant features a 128k context window and native multimodal support, making it the perfect choice for real-time applications.
$ 0.28
$ 0.4
text
$ 1.12
$ 1.6
text
API
Web Search
curl --request POST "https://gptproto.com/v1/responses" \
--header "Authorization: Bearer $GPTPROTO_API_KEY" \
--header "Content-Type: application/json" \
--data '{
"model": "gpt-4.1-mini",
"tools": [
{
"type": "web_search_preview"
}
],
"input": [
{
"role": "user",
"content": [
{
"type": "input_text",
"text": "What are the latest breakthroughs in quantum computing and their potential applications?"
}
]
}
]
}'Standout Chat 4.1 Mini Features
The technical advantages that make chat 4.1 mini the leading choice for developers needing speed and 4.1 intelligence.
Enhanced Vision Reasoning
The 4.1 mini excels at OCR and spatial reasoning, making it perfect for chat apps that need to analyze complex UI screenshots.
128k Context Reliability
Maintain context throughout long chat sessions with the 128k window, optimized for high-accuracy RAG and needle-in-a-haystack tasks.
Sub-200ms Low Latency
The chat 4.1 mini is built for speed, delivering tokens 2.5x faster than standard models for immediate chat feedback.
How to Get a gpt-4.1-mini API Key
Getting a gpt-4.1-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 $0.28 / $1.12 it's a cheaper gpt-4.1-mini API key than going direct, and one key works across every model on the platform. Full gpt-4.1-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-4.1-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-4.1-mini.
Make your first API call
Use your API key with our sample code to send a request to gpt-4.1-mini via GPT Proto and see instant AI-powered results.
Chat 4.1 Mini FAQ: Performance and Speed
Common questions about deploying the chat 4.1 mini model, covering performance benchmarks, 4.1 pricing, and mini architecture benefits.
How do I migrate my chat app to the chat 4.1 mini model?
Migrating to chat 4.1 mini is straightforward because the API structure is identical to previous models. Simply update your model parameter to 'gpt-4.1-mini' in your request body. The 4.1 mini model supports all standard chat completion parameters, ensuring that your existing chat code for 4.1 or earlier versions remains functional while gaining the speed benefits of the mini architecture.
What is the typical response latency for chat 4.1 mini?
The chat 4.1 mini is optimized for sub-200ms Time-To-First-Token performance. This makes the 4.1 mini approximately 2.5x faster than standard flagship models. For most chat prompts, you can expect a total round-trip response time between 400ms and 800ms, making this mini model ideal for real-time customer support agents and interactive 4.1 chat tools.
Does the chat 4.1 mini support vision and images?
Yes, chat 4.1 mini is a native multimodal model. It includes advanced vision reasoning capabilities, outperforming previous mini class models in OCR and spatial reasoning tasks. With an MMMU score of 61.2%, the 4.1 mini can accurately process UI screenshots, charts, and handwritten notes within a single chat completion request.
What is the context window size for chat 4.1 mini?
The chat 4.1 mini features a 128,000 token context window, allowing you to process long documents or deep chat histories. It maintains over 95% retrieval accuracy across this entire window, making the 4.1 mini a highly reliable choice for Retrieval-Augmented Generation (RAG) tasks where finding specific information in a large chat context is necessary.
Is data sent to chat 4.1 mini used for training?
No. Data sent via our platform to the chat 4.1 mini model is never used for training or model improvement by OpenAI or GPTProto.com. Your chat interactions remain private and secure within the 4.1 mini environment, ensuring that enterprise-level data privacy standards are met for every 4.1 mini request.
How much does it cost to use the chat 4.1 mini API?
The chat 4.1 mini is a cost-optimized model priced at $0.15 per 1M input tokens and $0.60 per 1M output tokens. You can also take advantage of a 50% discount on 4.1 mini input tokens for cached context. This pricing makes the mini variant significantly more affordable than the 4.1 Pro version while maintaining high-tier reasoning for chat tasks.
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