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OpenAI: GPT-5.1Reason Smarter, Respond Faster

Try OpenAI: GPT-5.1API Documentation

Unlock GPT-5.1 Power

Dual Modes

Instant and Thinking

Routes queries to GPT-5.1 Instant for speed or Thinking for complex reasoning automatically.

Adaptive Reasoning

Dynamic Think Time

Adjusts computation depth per prompt, speeding simple tasks and deepening analysis for hard ones.

Context Retention

400K Token Window

Holds context across long conversations, enabling precise multi-turn interactions.

Examples

See what OpenAI: GPT-5.1 can create

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

Code Review

“Review this Python function for efficiency and bugs: def fibonacci(n): if n <= 1: return n else: return fibonacci(n-1) + fibonacci(n-2). Suggest optimizations and rewrite with memoization.”

Data Analysis

“Analyze this sales dataset: Q1: 1200 units, Q2: 1500, Q3: 1100, Q4: 1800. Identify trends, forecast Q5, and recommend strategies using adaptive reasoning.”

Tech Summary

“Summarize quantum computing advances in 2025, explain key concepts simply, and predict enterprise impacts in a structured report.”

Workflow Automation

“Design a customer support script for handling refunds: include escalation logic, tone control for empathy, and integration steps for CRM systems.”

For Developers

A few lines of code.
GPT-5.1. One API 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-5.1

Read the docs

OpenAI: GPT-5.1 API provides access to Instant and Thinking models via LLM endpoints. It supports adaptive routing for optimal performance. Use it for automation and complex reasoning tasks.

GPT-5.1 adds automatic model routing and adaptive reasoning. It splits into Instant for speed and Thinking for depth. Context window expands to 400K tokens.

ModelsLab hosts OpenAI: GPT-5.1 model as a direct API alternative. Access full features without OpenAI subscriptions. Integrates seamlessly into workflows.

Instant mode prioritizes low latency for quick responses. Thinking mode allocates more reasoning for multi-step problems. Auto-routing selects based on query complexity.

Yes, with 400K token window for extended conversations. Maintains accuracy in multi-turn interactions. Ideal for document analysis and support bots.

Reduces token costs and latency via optimizations. Handles diverse tasks from transactional to analytical. Improves throughput in enterprise systems.

Ready to create?

Start generating with OpenAI: GPT-5.1 on ModelsLab.

Try OpenAI: GPT-5.1API Documentation