100% Structured Output
The json_schema mode ensures model responses strictly match your technical requirements, eliminating the need for complex retry logic.
gpt-4o / web-search
Chat GPT 4o is OpenAI's flagship multimodal model, offering native reasoning across text and vision. It delivers 2x the speed of GPT-4 Turbo with 128k context and 100% structured output reliability for complex data extraction tasks.
$ 1.75
$ 2.5
text
$ 7
$ 10
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-4o",
"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?"
}
]
}
]
}'Chat GPT 4o Technical Standouts
Explore the core features that define the Chat GPT 4o experience, from native multimodality to industry-leading speed.
High-Speed Inference
At twice the speed of its predecessors, Chat GPT 4o is the gold standard for agentic loops and rapid-fire conversational chat tools.
Global Token Efficiency
A new tokenizer significantly reduces the token count for Asian and Arabic scripts, making global chat deployment more affordable than ever.
Native Multimodality
Trained as a single neural network, Chat GPT 4o excels at reasoning across text, vision, and audio without losing context between modalities.
How to Get a gpt-4o API Key
Getting a gpt-4o 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 $1.75 / $7 it's a cheaper gpt-4o API key than going direct, and one key works across every model on the platform. Full gpt-4o 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-4o, 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-4o.
Make your first API call
Use your API key with our sample code to send a request to gpt-4o via GPT Proto and see instant AI-powered results.
Chat GPT 4o Common Questions
Technical answers regarding Chat GPT 4o latency, pricing, and multimodal capabilities for developers using our unified API platform.
What makes Chat GPT 4o faster than previous models?
Chat GPT 4o is engineered for low latency, delivering tokens at twice the speed of GPT-4 Turbo. This efficiency stems from its native multimodal architecture, which streamlines how the model processes text, vision, and audio inputs simultaneously, resulting in a significantly faster Time-To-First-Token.
How reliable are Chat GPT 4o structured outputs?
The model supports a specialized 'json_schema' mode that guarantees 100% reliability. This means every response strictly follows your provided schema, making Chat GPT 4o the most stable choice for developers who need to ingest AI data directly into databases without formatting errors.
Can Chat GPT 4o handle native vision and audio?
Yes, Chat GPT 4o is trained end-to-end on a single neural network for text, vision, and audio. This allows it to interpret complex technical diagrams, handwritten notes, and even the emotional tone in audio far more effectively than models using separate encoders.
What is the context window for Chat GPT 4o?
The model features a 128,000-token context window, allowing it to process the equivalent of a 300-page book in a single prompt. For most chat applications, this provides more than enough memory to maintain long-term coherence across extended conversations.
How much does the Chat GPT 4o API cost?
Input tokens are priced at $2.50 per million, while output tokens cost $10.00 per million. You can further reduce these costs by leveraging our context caching for 50% off or using the Batch API for non-real-time requests, which also offers a 50% discount.
Does Chat GPT 4o support real-time web search?
Through the Responses API, Chat GPT 4o can utilize the 'web_search' tool to fetch live internet data. This includes domain filtering and source citations, ensuring your chat application provides the most current information available from the web.
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