OpenAI: GPT-5.4 Image 2

openai/gpt-5.4-image-2

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, allo...

vision

MODALITIES

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INPUT PRICE

$8per 1M

OUTPUT PRICE

$15per 1M

CONTEXT

272K

RELEASED

Apr 22, 2026

Provider					Chat
FastAPI	$8	$15	Hit rate— Cache read$2	100.0%

Capabilities

Input modalities

fileimagetext

Output modalities

imagetext

Features

include_reasoninglogprobsmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstop_logprobsverbosity

Get API Key

Create an API key from the Keys page, then set it as an environment variable:

export ONLIST_API_KEY=sk-...

Make your first request

Endpoints

POSThttps://onlist.io/v1/images/generations

Request Headers

Authorization:Bearer $ONLIST_API_KEY

Content-Type:application/json

Model:openai/gpt-5.4-image-2

Code samples

curl https://onlist.io/v1/images/generations \
  -H "Authorization: Bearer $ONLIST_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "model": "openai/gpt-5.4-image-2",
       "prompt": "A white siamese cat",
       "n": 1,
       "size": "1024x1024"
     }'

Replace $ONLIST_API_KEY with the API key from your Keys page.

Authentication

All requests must include an Authorization: Bearer <TOKEN> header. Generate keys from the Keys page; keys can be scoped to specific models, groups, IP ranges, and rate limits.

Supported parameters

Name	Type	Description
`include_reasoning`
`logprobs`	boolean	Whether to return log probabilities of the output tokens.
`max_tokens`	integer	Maximum number of tokens to generate in the completion.
`reasoning`
`reasoning_effort`	string	Constrains effort on reasoning. Supported values: "low", "medium", "high".
`response_format`	object	Specifies the output format. Use {"type": "json_object"} for JSON mode.
`seed`	integer	If specified, the system will attempt deterministic sampling for reproducible results.
`structured_outputs`
`top_logprobs`	integer	Number of most likely tokens to return at each position (0-20). Requires logprobs: true.
`verbosity`

These are the request parameters this model accepts. Parameter semantics follow the OpenAI Chat Completions specification.