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GPT-5.4 Mini

openaiopenai/gpt-5.4-mini

Strongest mini model for coding, computer use, and subagents. Fast and cost-efficient with reasoning token support, 400K context window and 128K max output.

Context Length
400K
Max Output
128K
Input Priceper 1M tokens
$1.80/ 1M tokens
Output Priceper 1M tokens
$5.40/ 1M tokens

Modalities

textimage→text

Pricing Breakdown

TypeRate
Input$1.80 / 1M tokens
Output$5.40 / 1M tokens

Supported Parameters

temperaturemax_tokenstop_ptoolstool_choiceresponse_formatreasoningstop

API Usage Examples

Use the global api.therouter.ai endpoint shown below for new integrations; the legacy China accelerated endpoint is retired.

cURL
curl https://api.therouter.ai/v1/chat/completions   -H "Content-Type: application/json"   -H "Authorization: Bearer $THE_ROUTER_API_KEY"   -d '{
    "model": "openai/gpt-5.4-mini",
    "messages": [
      {"role": "user", "content": "Summarize the key points from this input."}
    ]
  }'
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