System-2 Reasoning
Deliberate internal verification for physics, math, and logic tasks requiring high cognitive precision.
gpt-5 / web-search
Chat GPT 5 is OpenAI's frontier reasoning model. With 256k context and agentic autonomy, this chat powerhouse handles complex multi-step planning and native multimodal video processing via the GPTProto.com unified API integration.
$ 0.875
$ 1.25
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-5",
"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?"
}
]
}
]
}'Key Features of Chat GPT 5
Discover the technical advancements that make Chat GPT 5 the leading model for complex automation.
Native Multimodality
Unified processing for video, audio, and text to enable real-time situational awareness and analysis.
Extreme Reliability
Strict instruction following for complex JSON schemas and deeply nested system prompts in production.
Agentic Autonomy
Manages long-running tasks across multiple tools without losing state or looping endlessly during execution.
How to Get a gpt 5 API Key
Getting a gpt 5 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 $0.875 / $7 it's a cheaper gpt 5 API key than going direct, and one key works across every model on the platform. Full gpt 5 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, 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.
Make your first API call
Use your API key with our sample code to send a request to gpt 5 via GPT Proto and see instant AI-powered results.
Chat GPT 5 FAQ: API and Performance
How does Chat GPT 5 handle logic tasks?
Chat GPT 5 uses internal chain-of-thought verification, often called System-2 reasoning. This allows the chat model to cross-check its own logic before outputting a response, which cuts down on hallucinations by nearly 40% compared to previous chat versions.
What is the context window for Chat GPT 5?
The model supports a massive 256,000-token context window. This allows the chat engine to process entire codebases or long legal documents in a single chat session without losing track of details from the beginning of the prompt.
Can Chat GPT 5 process video input?
Yes, it is a natively multimodal chat model. It can process text, images, audio, and video streams simultaneously. This makes it possible to chat about temporal events in a video file, such as identifying specific moments of action.
How do Chat GPT 5 pricing and credits work?
On GPTProto.com, chat gpt 5 costs $10.00 per 1M input tokens and $30.00 per 1M output tokens. We offer a unified credit system, so you can chat with multiple models using a single balance, plus 50% discounts for batch processing.
Is Chat GPT 5 backward compatible?
Migrating your chat application is simple. The API is fully backward compatible with GPT-4o. You only need to update the model parameter to 'gpt 5' in your code to begin using the enhanced chat reasoning and agentic features.
Is chat data used for model training?
Privacy is a priority for our chat users. Data sent through the GPTProto.com API to chat gpt 5 is never used for training OpenAI's models or any other third-party services. Your enterprise chat interactions remain strictly confidential.
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