OpenAI: GPT-5.5 Pro (batch)
- by openai
- openai/gpt-5.5-pro:batch
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...
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$15 per million tokens
- What you pay for everything the model reads. A 1,000-word prompt costs about $0.02.
- Output price$90 per million tokens
- What you pay for everything the model writes. Output usually costs more than input. A 500-word answer costs about $0.06.
- Modalitiesfile, image, text 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.
- Knowledge cutoff2025-12-01
- The last date its training data covers. It does not know about anything after that unless you put it in the prompt.
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_reasoningmax_tokensreasoningreasoning_effort