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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!"}
    ]
  }'