GPT-5.4 Pro

GPT-5.4 Pro is OpenAI's most advanced model, building on GPT-5.4's unified architecture with enhanced reasoning capabilities for complex, high-stakes tasks. It features a 1M+ token context window (922K input, 128K output) with support for text and image inputs. Optimized for step-by-step reasoning, instruction following, and accuracy, GPT-5.4 Pro excels at agentic coding, long-context workflows, and multi-step problem solving.

ChatOpenAI1M tokens$32.7018 / $196.2107 · 1M

openai/gpt-5.4-pro

Context
1M tokens
Completion cap
128,000
Tools
Yes
JSON
Yes
Released
2026-03-05

Call it from Geek Hub

Same OpenAI SDK. Change the base URL and the model id.

curl https://api.geekhub.mx/v1/chat/completions \
  -H "Authorization: Bearer $GEEKHUB_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.4-pro",
    "messages": [{"role": "user", "content": "Hola"}]
  }'
Get an API key

Frequently asked questions

What is GPT-5.4 Pro?
GPT-5.4 Pro is OpenAI's most advanced model, building on GPT-5.4's unified architecture with enhanced reasoning capabilities for complex, high-stakes tasks. It features a 1M+ token context window (922K input, 128K output) with support for text and image inputs. Optimized for step-by-step reasoning, instruction following, and accuracy, GPT-5.4 Pro excels at agentic coding, long-context workflows, and multi-step problem solving. GPT-5.4 Pro runs on the Geek Hub API (OpenAI-compatible). Model id: openai/gpt-5.4-pro.
Is GPT-5.4 Pro free?
No. Input is $32.7018 per 1M tokens and output is $196.2107 per 1M tokens on Geek Hub (markup included).
What is the context length of GPT-5.4 Pro?
GPT-5.4 Pro has a 1M tokens context window. It supports up to 128,000 completion tokens.
Does GPT-5.4 Pro support tool calling and structured outputs?
GPT-5.4 Pro accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.
When was GPT-5.4 Pro released?
GPT-5.4 Pro was released on 2026-03-05.

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