GPT-5.4 Pro reasoning

openrouter
openai
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.

Capabilities

Context Window 1M tokens
Max Output 128k tokens
Inputs
Outputs

Pricing (per 1M tokens)

Input $30.00
Output $180.00
Cache Read -
Cache Write -

Supported Parameters

include_reasoningmax_tokensreasoningresponse_formatseedstructured_outputstool_choicetools

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