OpenAI: GPT-5.2 Pro
openai/gpt-5.2-pro · OpenAINot yet established- Declared family
- GPT
- Evidence confidence
- Unknown
- Declared tokenizer tag
- GPT
- Entered catalogue
- 10 December 2025
- Last tested
- Not yet measured
- Measurement
- Awaiting measurement
Evidence stack
Signals of different kinds, weighed together| Signal | Result | Reference |
|---|---|---|
| Tokenizer signature | Not measured | – |
| API surface | Identical contract to 1 other entry | api_499bcfa6 |
| Context and output | 400,000 context · 128,000 max output | declared |
| Reasoning contract | Mandatory · efforts xhigh, high, medium · default medium | declared |
| Serving providers observed | None recorded yet | – |
Declared record
What the catalogue claims about this modelGPT-5.2 Pro is OpenAI’s most advanced model, offering major improvements in agentic coding and long context performance over GPT-5 Pro. It is optimized for complex tasks that require step-by-step reasoning,...
- Modalities
- text+image+file->text
- Declared tokenizer
- GPT
- Prompt price
- $21.0 / M tokens
- Completion price
- $168 / M tokens
Supported parameters
include_reasoningmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetools
defaults: {"temperature":null,"top_p":null,"frequency_penalty":null}
History
Every observation, kept as taken- 10 December 2025Enters the OpenRouter catalogue declared as GPT.
Cite this page as the evidence record for OpenAI: GPT-5.2 Pro: the URL is stable, measurements are dated, and revisions append to the history above. Method: tokenizer fingerprinting, v1, 50 strings. The raw data behind every figure is on the data page.
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