OpenAI: o3 Pro

openai/o3-pro · OpenAIUnmeasurable

Declared family: GPT
Evidence confidence: Unknown
Declared tokenizer tag: GPT
Entered catalogue: 10 June 2025
Last tested: Not yet measured
Measurement: Deferred: measurement cost above the per-model cap

Evidence stack

Signals of different kinds, weighed together

Signal	Result	Reference
Tokenizer signature	Not measured	–
API surface	Identical contract to 1 other entry	api_4347be44
Context and output	200,000 context · 100,000 max output	declared
Reasoning contract	Optional	declared
Serving providers observed	None recorded yet	–

Declared record

What the catalogue claims about this model

The o-series of models are trained with reinforcement learning to think before they answer and perform complex reasoning. The o3-pro model uses more compute to think harder and provide consistently...

Modalities: text+image+file->text
Declared tokenizer: GPT
Prompt price: $20.0 / M tokens
Completion price: $80.0 / M tokens

Supported parameters

include_reasoningmax_tokensreasoningresponse_formatseedstructured_outputstool_choicetools

defaults: {"temperature":null,"top_p":null,"frequency_penalty":null}

Catalogue entry

History

Every observation, kept as taken

10 June 2025Enters the OpenRouter catalogue declared as GPT.

Cite this page as the evidence record for OpenAI: o3 Pro: the URL is stable, measurements are dated, and revisions append to the history above. Method: tokenizer fingerprinting, v1, 50 strings.