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license: apache-2.0
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CometAPI Model Page: [GPT-5 ](https://www.cometapi.com/gpt-5-api/)
**GPT-5** is OpenAI’s latest flagship language model, presented as a *unified, multimodal reasoning system* that improves on prior generations in **reasoning**, **coding**, **long-context understanding**, and **safety-aware outputs**. It combines fast non-reasoning components with a deeper reasoning model and a real-time router that selects the best submodel for a task, enabling the system to “know when to think.”
## Basic Features
- ***\*Multimodality & tooling:\****: GPT-5 accepts **text and images** (and is designed to work with external tools and browsing/agents where allowed), and OpenAI highlights improved **voice, UI, integrated connectors (e.g., Gmail/Calendar)** and agentic workflows.
- **Expanded Context Window**: Supports up to **1,000,000 tokens**, allowing for far longer documents, codebases, or conversation histories .
- **Context & limits:** **400K token total context window** (split implicitly between input and output, with typical splits such as ~272K input + 128K output )
## Technical **Architecture**
GPT-5 is a **unified system** composed of:
1. A **fast** non-reasoning model for routine queries.
2. A **deep reasoning** variant (“GPT-5 Thinking”) for complex problems.
3. A **real-time router** that dynamically selects the optimal pathway based on prompt complexity, tool requirements, and user intent .
This design leverages **parallel test-time compute** for GPT-5 Pro, ensuring high-stakes tasks receive the most **comprehensive** processing available.
## Benchmark **Performance**
- **Coding**: Achieves **74.9%** on SWE-Bench Verified, surpassing prior models by over 5 percentage points and using **22% fewer tokens** and **45% fewer tool calls** than its predecessor.
- **Health**: Scores **46.2%** on HealthBench Hard, demonstrating significant gains in **medical reasoning** and **patient-focused guidance**.
- **Factuality**: Approximately **80% fewer hallucinations** in “thinking” mode compared to OpenAI o3, and **45% fewer** factual errors in standard chat mode relative to GPT-4o .
- **Multimodal**: Excels at analyzing text, images, and video inputs, enhancing visual reasoning and perception.
- **Writing**: Captures literary rhythm and nuanced structures like free verse or iambic lines more reliably
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## Model Versions
| Version | Purpose | Cost |
| --------------------- | ------------------------------------------------------------ | --------------------------------------- |
| **gpt-5** | Default unified model | Input Tokens:$1.00 Output Tokens: $8.00 |
| **gpt-5-2025-08-07** | Performance equal to gpt-5 | Input Tokens:$1.00 Output Tokens: $8.00 |
| **gpt-5-chat-latest** | GPT-5 Chat points to the GPT-5 snapshot currently used in ChatGPT. GPT-5 is our next-generation, high-intelligence flagship model. | Input Tokens:$1.00 Output Tokens: $8.00 |
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## Limitations
- **Not AGI**: While a leap forward, GPT-5 still lacks **continuous learning** and **self-improvement** outside of retraining cycles .
- **Remaining Hallucinations**: Despite reduction, **verified sources** are recommended for critical decisions.
- **Compute & Cost**: High-performance modes (Pro, Thinking) incur **significant token fees** and require careful **budget management**.
## How to call **`gpt-5`** API from CometAPI
### **`\**`gpt-5`\**`** API Pricing in CometAPI，20% off the official price:
| Input Tokens | $1 |
| ------------- | ---- |
| Output Tokens | $8 |
### Required Steps
- Log in to [cometapi.com](http://cometapi.com/). If you are not our user yet, please register first
- Get the access credential API key of the interface. Click “Add Token” at the API token in the personal center, get the token key: sk-xxxxx and submit.
- Get the url of this site: https://api.cometapi.com/
### Use Method
1. Select the “`gpt-5`”/ “`gpt-5-2025-08-07`” / “`gpt-5-chat-latest`” endpoint to send the API request and set the request body. The request method and request body are obtained from our website API doc. Our website also provides Apifox test for your convenience.
2. Replace <YOUR_API_KEY> with your actual CometAPI key from your account.
3. Insert your question or request into the content field—this is what the model will respond to.
4. . Process the API response to get the generated answer.
CometAPI provides a fully compatible REST API—for seamless migration. Key details to [API doc](https://apidoc.cometapi.com/api-13851472):
- **Core Parameters**: `prompt`, `max_tokens_to_sample`, `temperature`, `stop_sequences`
- **Endpoint:** https://api.cometapi.com/v1/chat/completions
- **Model Parameter:** “`gpt-5`”/ “`gpt-5-2025-08-07`” / “`gpt-5-chat-latest`“
- **Authentication:** ` Bearer YOUR_CometAPI_API_KEY`
- **Content-Type:** `application/json` .
API Call Instructions: gpt-5-chat-latest should be called using the standard `/v1/chat/completions forma`t. For other models (gpt-5, gpt-5-mini, gpt-5-nano, and their dated versions), using `the /v1/responses format` [is recommended](https://apidoc.cometapi.com/api-18535147). Currently two modes are available. |