Is GPT-5.4 Image 2 available on FastMetal?

Not at the moment. GPT-5.6 Sol, from the same lab, is available on the FastMetal API today.

What is the context window of GPT-5.4 Image 2?

272,000 tokens, shared between the prompt and the response.

openai/gpt-5-4-image-2

Not Available

GPT-5.4 Image 2

[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...

4/21/2026

272,000 tokens

Specifications

Modalities

Input

image

text

file

Output

image

text

Supported Parameters

frequency_penalty

include_reasoning

logit_bias

logprobs

max_tokens

presence_penalty

reasoning

reasoning_effort

response_format

seed

stop

structured_outputs

top_logprobs

Max Output Tokens

128,000

Reasoning Configuration

Default: Thinking off
Selectable effort levels: xhigh
high
medium
low
none
Turning thinking off: Possible (reasoning.enabled: false)

How to control thinking, and what it costs

Frequently asked questions

Is GPT-5.4 Image 2 available on FastMetal?: Not at the moment. GPT-5.6 Sol, from the same lab, is available on the FastMetal API today.
What is the context window of GPT-5.4 Image 2?: 272,000 tokens, shared between the prompt and the response.

Models you can use on FastMetal