GPT-5.4

What is GPT-5.4?

GPT-5.4 is OpenAI’s latest frontier model, unifying the Codex and GPT lines into a single system. It features a 1M+ token context window (922K input, 128K output) with support for...

Specifications

• Developer: OpenAI
• Context window: 1.1M tokens
• Max output: 128K tokens
• Input modalities: text, image, file
• Output modalities: text
• Input price: $2.50 per 1M tokens
• Output price: $15.00 per 1M tokens
• Knowledge cutoff: —
• Supported parameters: include_reasoning, max_completion_tokens, max_tokens, reasoning, response_format, seed, structured_outputs, tool_choice, tools

Use GPT-5.4 with PromptLayer

PromptLayer lets teams manage, evaluate, and observe prompts that run on GPT-5.4 alongside every other model in their stack. Version prompts, run evals across models, and ship safe rollouts from the same dashboard.

Ready to try it yourself? Sign up for PromptLayer and start managing your prompts in minutes.