| Signal | Result | Reference |
|---|---|---|
| Tokenizer signature | Not measured | – |
| API surface | No other entry shares this exact contract | api_cabeca37 |
| Context and output | 128,000 context · 32,000 max output | declared |
| Reasoning contract | None declared | declared |
| Serving providers observed | None recorded yet | – |
GPT-5.2 Chat (AKA Instant) is the fast, lightweight member of the 5.2 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...
Supported parameters
max_completion_tokensresponse_formatseedstructured_outputstool_choicetools
defaults: {"temperature":null,"top_p":null,"frequency_penalty":null}
Cite this page as the evidence record for OpenAI: GPT-5.2 Chat: 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.
