Happy Horse 1.0 is now on ModelsLab

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

OpenAI: GPT-5.4 ProReason Deeper. Solve Harder

Try OpenAI: GPT-5.4 ProAPI Documentation

Unlock GPT-5.4 Pro Power

Max Reasoning

Thinks Step-by-Step

Uses extra compute for precise answers on tough problems via Responses API.

1M Tokens

Handles Massive Context

Processes 1.05M token inputs for long documents and datasets without splitting.

Tool Search

Scales Tool Ecosystems

Retrieves only needed tool definitions, cutting tokens by 47% with same accuracy.

Examples

See what OpenAI: GPT-5.4 Pro can create

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

Code Workflow

“Analyze this 50K token codebase. Identify bugs, suggest refactors using tools, output fixed version with tests.”

Data Synthesis

“Review 200K token market report dataset. Extract trends, run analysis via tools, generate executive summary table.”

Research Plan

“Plan agentic web research on quantum computing advances. Use tool search for sources, verify facts, synthesize report.”

Computer Task

“Simulate desktop session: navigate property tax portal, fill HOA form with provided data, confirm submission steps.”

For Developers

A few lines of code.
Pro reasoning. 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 OpenAI: GPT-5.4 Pro

Read the docs

GPT-5.4 Pro is OpenAI's highest-capability model for demanding tasks. It uses more compute for deeper reasoning. Available via OpenAI: GPT-5.4 Pro API in Responses API.

Supports reasoning.effort: medium, high, xhigh for complex problems. Reduces hallucinations in analysis and research. Excels in long, tool-heavy workflows.

Features 1.05M token context window with 128K output. Handles large documents and datasets in one session. Prompts over 272K tokens incur higher rates.

OpenAI: GPT-5.4 Pro alternative via ModelsLab matches native performance. Includes tool search and computer use. Lower latency for agentic tasks.

Yes, with tool search reducing token use by 47% across ecosystems. Improves agentic coding and web research. Native computer-use for desktop interactions.

Costs $30 input, $180 output per million tokens. Regional endpoints add 10% uplift. Background mode avoids timeouts on long tasks.

Ready to create?

Start generating with OpenAI: GPT-5.4 Pro on ModelsLab.

Try OpenAI: GPT-5.4 ProAPI Documentation