OpenAI: GPT-5.4 (batch)

What the numbers mean

Context window1,050,000 tokens

How much the model can read in one request, counting your prompt, any files and the conversation so far. That is about 790,000 words, or 1,600 pages.

Max output128,000 tokens

The longest single reply it can write: about 96,000 words.

Input price$1.25 per million tokens

What you pay for everything the model reads. A 1,000-word prompt costs less than a cent.

Output price$7.5 per million tokens

What you pay for everything the model writes. Output usually costs more than input. A 500-word answer costs less than a cent.

Modalitiestext, image, file in, text out

The kinds of content it accepts and the kinds it produces. A model that takes images in can read a screenshot; one that only puts text out cannot draw.

Supported parameters

The settings you can pass with a request. A model that lists tools can call functions; one that lists structured_outputs can be held to a JSON schema.

• include_reasoning
• max_tokens
• reasoning
• reasoning_effort
• response_format
• seed
• structured_outputs
• tool_choice
• tools
• verbosity