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TEXTOpenAIMetered
GPT 5.4Medium model details and integration guide
GPT 5.4Medium is positioned for text workloads with metered pricing on HeyWaii.
Page last updated: April 26, 2026
Relay Access
Base URL: https://www.heywaii.com/v1
Model ID: gpt-5.4-medium
Overview
GPT 5.4Medium is part of the HeyWaii API Market catalog for text-heavy product workflows, assistants, and automation tasks.
This model is configured with metered billing, so cost tracks usage rather than a flat call count.
It is available in the catalog with model positioning and a public sale price from the current workbook.
Model explainer
GPT 5.4Medium is a text generation API model page built to explain capability fit, real workflow value, and integration friction.
GPT 5.4Medium is strongest around Token-based billing, Text generation, Production relay usage, which makes it a practical option for product-facing workflows.
If your workload is close to App copilots, Workflow automation, Developer-facing AI integrations, this page should be enough to start model selection and pre-rollout testing.
From a modality angle, GPT 5.4Medium fits Text generation, Token metered workflows and can be validated on one core use case before wider rollout.
Best for
Use case 01
App copilots
Use case 02
Workflow automation
Use case 03
Developer-facing AI integrations
Modalities
Public pricing and price advantage
Public sell-side pricing is $2.50/1M tokens, making it easier to test cost, stage rollouts, and estimate volume budgets.
HeyWaii public price
token
$2.50/1M tokens
Pricing readout
GPT 5.4Medium is publicly listed at $2.50/1M tokens, so you can estimate cost before rollout.
Metered billing is usually a better fit for longer conversations and sustained request volume.
OpenAI-compatible access reduces the cost of retooling SDKs and request formats.
Comparison cards only show public price baselines that can be verified for this page.
Model capability metrics
Category
text
Billing mode
Metered
Relay access
OpenAI-compatible
Public price
$2.50/1M tokens
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How to call
1. Create a HeyWaii API key first so GPT 5.4Medium can be tested from a real environment.
2. Point your base URL to the HeyWaii relay and keep your existing OpenAI-compatible request flow.
3. Set the model to gpt-5.4-medium, validate on low traffic first, then scale up.
Selection guidance
Low-friction API access for text generation workflows.
OpenAI-compatible integration helps reduce migration overhead.
Metered billing fits sustained or higher-volume usage.
Example request
POST https://www.heywaii.com/v1/chat/completions
{
"model": "gpt-5.4-medium",
"messages": [
{
"role": "user",
"content": "Say hello from HeyWaii relay."
}
]
}FAQ
What is GPT 5.4Medium actually good for?
GPT 5.4Medium is currently best suited for App copilots, Workflow automation, Developer-facing AI integrations. Before production rollout, validate it on your highest-value task first.
How much does GPT 5.4Medium cost on HeyWaii?
GPT 5.4Medium is listed here at $2.50/1M tokens, which makes cost modeling and staged rollout planning much easier before full deployment.
Can I use GPT 5.4Medium with an OpenAI-compatible stack?
If you already run an OpenAI-compatible stack, GPT 5.4Medium can usually be tested with the same request pattern after setting your API key, base URL, and model ID.