OpenAI: o4 Mini (batch)

openai/o4-mini:batch · OpenAIDeclared and measured agree

Tokenizer lineage (measured): GPT
Declared tokenizer tag: GPT
Entered catalogue: 16 April 2025
Measurement: Variant: inherits its base model’s measurement
Evidence confidence: Very high

Why very high: inherited from openai/o4-mini: a serving variant shares its base model's tokenizer.

Evidence

✓ inherited from openai/o4-mini: a serving variant shares its base model's tokenizer

Compare with OpenAI: o4 Mini

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This entry is a serving variant of OpenAI: o4 Mini. A variant shares its base model's tokenizer by construction, so the measurement lives on the base record and this page inherits it.

Identity statement

OpenAI: o4 Mini (batch) is OpenAI's model. Its measured tokenizer sits with the GPT group, which is evidence that it builds on the GPT tokenizer. Tokenizer reuse is normal engineering, open vocabularies travel between labs, and this says nothing against OpenAI's authorship of the model itself.

What we checked

Four different kinds of evidence, and what each one showed

We checked	What we found	Where it came from
How it counts tokens	Not measured yet	we measured it
How its API is set up	Set up identically to 3 other listings, field for field	api_a2a7f2ca
How much it can read and write	Reads up to 200,000 tokens at once, writes up to 100,000	its own listing
Whether it thinks before answering	Reasons when asked to	its own listing

Declared record

What the catalogue claims about this model

OpenAI o4-mini is a compact reasoning model in the o-series, optimized for fast, cost-efficient performance while retaining strong multimodal and agentic capabilities. It supports tool use and demonstrates competitive reasoning...

Modalities: text+image+file->text
Declared tokenizer: GPT
Prompt price: $0.55 / M tokens
Completion price: $2.20 / M tokens

Supported parameters

include_reasoningmax_tokensreasoningresponse_formatseedstructured_outputstool_choicetools

defaults: {}

Catalogue entry

History

Every observation, kept as taken

16 April 2025Enters the OpenRouter catalogue declared as GPT.