GPT-5.4

openai/gpt-5.4

Most capable frontier model. Exceptional at complex professional work with configurable reasoning depth.

Specifications

Context Window 1.1M tokens

Max Output 128K tokens

Latency moderate

Knowledge Cutoff Aug 2025

Training Data Aug 2025

Pricing

Input $2.50 per 1M tokens

Output $15.00 per 1M tokens

Capabilities

text Text generation and understanding

vision Image and visual input processing

tool use Function calling and tool integration

reasoning Advanced multi-step reasoning with chain-of-thought

API Identifiers

Model ID openai/gpt-5.4

Provider API ID gpt-5.4

Usage via Multi-Router

curl https://api.multi-router.ai/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -H "x-mr-router-id: YOUR_ROUTER_ID" \
  -d '{
    "model": "openai/gpt-5.4",
    "messages": [
      {"role": "user", "content": "Hello!"}
    ]
  }'