Seedance 2.0 is here - create consistent, multimodal AI videos faster with images, videos, and audio in one prompt.

Try Now
Skip to main content
Available now on ModelsLab · Language Model

GPT-5GPT-5 API Power

Try GPT-5API Documentation
GPT-5

Unlock GPT-5 Capabilities

Massive Context

400k Token Window

Process entire documents in one call with 272k input and 128k output tokens.

Agentic Workflows

Responses API Chains

Maintain chain-of-thought across turns for multi-step reasoning and tool use.

Freeform Tools

Execute Arbitrary Code

Send raw text like SQL or commands directly to custom tools without JSON limits.

Examples

See what GPT-5 can create

Copy any prompt below and try it yourself in the playground.

Code Debug

“Analyze this Python function for bugs, explain fixes step-by-step, and output corrected code in a fenced block.”

Data Query

“Generate SQL for sales data from 2025, filter top products by region, using dialect-specific syntax.”

Agent Task

“Plan multi-step workflow to research market trends, call web search tool, synthesize findings into report.”

JSON Schema

“Output user profile data matching this JSON schema: {name: string, age: number, skills: array}, constrained format.”

For Developers

A few lines of code.
GPT-5. One call.

ModelsLab handles the infrastructure: fast inference, auto-scaling, and a developer-friendly API. No GPU management needed.

  • Serverless: scales to zero, scales to millions
  • Pay per token, no minimums
  • Python and JavaScript SDKs, plus REST API
API Documentation 
import requests


response = requests.post(
    "https://modelslab.com/api/v7/llm/chat/completions",
    json={
  "key": "YOUR_API_KEY",
  "prompt": "",
  "model_id": ""
}
)
print(response.json())

FAQ

Common questions about GPT-5

Read the docs

GPT-5 supports 400,000 tokens total, with ~272k input and 128k output. This exceeds GPT-4's 32k limit.

GPT-5 adds Responses API for agentic chains, freeform inputs, and CFGs. Earlier models lack persistent reasoning.

Use /v1/chat/completions for chats, /v1/responses for agents, /v1/realtime for streaming. All enable streaming.

GPT-5 serves as gpt 5 alternative with superior reasoning, tool use, and 400k context. Access via our LLM endpoint.

No, GPT-5 llm offers freeform function calling and built-in computer use. gtp3 5 lacks these agentic features.

Yes, it excels in coding, multi-step agents, and structured outputs as a gpt 5 alternative. Use grammar constraints for precision.

Ready to create?

Start generating with GPT-5 on ModelsLab.

Try GPT-5API Documentation