GPT-5.1

Overview

OpenAI's flagship, a frontier reasoning model with excellent coding, math and tool use and a large context window. Configurable reasoning effort lets you trade latency for depth on hard problems. First-party hosted with high uptime, priced at the top of the market. The model to reach for on genuinely difficult work.

Benchmarks

Standardized scores (0–100), normalized across the catalog.

Providers

LLMRouteHub routes to the cheapest healthy provider by default.

Use this model

curl https://llmroutehub.com/api/v1/chat/completions \
  -H "Authorization: Bearer $LLMROUTEHUB_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.1",
    "messages": [{ "role": "user", "content": "Hello" }]
  }'