OpenAI: GPT-5.4 Image 2

openai/gpt-5.4-image-2 · OpenAIUnmeasurable

Declared family: GPT
Evidence confidence: Unknown
Declared tokenizer tag: GPT
Entered catalogue: 21 April 2026
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	No other entry shares this exact contract	api_bcef578e
Context and output	272,000 context · 128,000 max output	declared
Reasoning contract	Optional · efforts xhigh, high, medium, low, none · default medium	declared
Serving providers observed	None recorded yet	–

Declared record

What the catalogue claims about this model

[GPT-5.4](https://openrouter.ai/openai/gpt-5.4) Image 2 combines OpenAI's GPT-5.4 model with state-of-the-art image generation capabilities from GPT Image 2. It enables rich multimodal workflows, allowing users to seamlessly move between reasoning, coding, and...

Modalities: text+image+file->text+image
Declared tokenizer: GPT
Prompt price: $8.00 / M tokens
Completion price: $15.0 / M tokens

Supported parameters

frequency_penaltyinclude_reasoninglogit_biaslogprobsmax_tokenspresence_penaltyreasoningreasoning_effortresponse_formatseedstopstructured_outputstop_logprobs

defaults: {"temperature":null,"top_p":null,"top_k":null,"frequency_penalty":null,"presence_penalty":null,"repetition_penalty":null}

Catalogue entry

History

Every observation, kept as taken

21 April 2026Enters the OpenRouter catalogue declared as GPT.

Cite this page as the evidence record for OpenAI: GPT-5.4 Image 2: the URL is stable, measurements are dated, and revisions append to the history above. Method: tokenizer fingerprinting, v1, 50 strings.