# GPT-5.4 — API pricing & integration guide | Y-API

> GPT-5.4 is listed as the entry that merged OpenAI’s Codex and GPT lines, with a 1,050,000-token window and text, image and file input. The reference describes a 922K input / 128K output split inside that window.

This is the markdown representation of https://y-api.bestvirtualgoods.com/models/openai/gpt-5.4. Generated by `scripts/generate-seo-assets.mjs` from the same copy the page renders — do not edit by hand.

Model ID: `openai/gpt-5.4`

Sources reviewed: 2026-10-21. Y-API catalog snapshot: 2026-10-21.

## Choosing this model

Selection advice by Y-API. The checks below are suggested evaluations, not published test results.

### Where to start

Use it for repository-level work where the input is mostly code and the output is a patch plus an explanation: a migration, a dependency bump, a test that needs rewriting.

### What to watch for

The input/output split inside the advertised window is the model’s, and the gateway may enforce a different ceiling. Long-context pricing tiers also apply upstream; this page’s rates are the catalog’s, so check the price table rather than assuming one flat rate.

## Model specifications

These are OpenRouter model-level specifications, not a Y-API compatibility test. A particular route may accept fewer input formats, parameters or tokens. Verify the features you need with a small request; a successful text response does not validate vision or tool calling.

| Field | Value |
| --- | --- |
| Context window | 1,050,000 tokens |
| Input | Text, Image, File |
| Output | Text |
| Listed on OpenRouter | 2026-03-05 |
| Parameters listed by OpenRouter | `include_reasoning`, `max_completion_tokens`, `max_tokens`, `reasoning`, `reasoning_effort`, `response_format`, `seed`, `structured_outputs`, `tool_choice`, `tools`, `verbosity` |

## API pricing & cost estimate

| Price basis | Input / 1M tokens | Output / 1M tokens |
| --- | --- | --- |
| Account credit | $2.50 | $15.00 |
| Cash equivalent | $0.25 | $1.50 |

$1 paid adds $10 of credit. Cash equivalent = credit consumed ÷ 10; this is not the model publisher’s list price.

Input tokens / request: 1000. Output tokens / request: 500. Number of requests: 1000.

Estimated credit consumed: $10.00. Estimated cash equivalent: $1.00.

Illustrative token budget, not measured usage or a quote. Includes input and output; excludes separate media charges, cache discounts and retries. Include billed reasoning tokens in your output budget where applicable. Actual billing follows usage returned by the service.

### Same token budget, different models

| Model | Estimated credit consumed | Estimated cash equivalent |
| --- | --- | --- |
| [GPT-5.4](https://y-api.bestvirtualgoods.com/models/openai/gpt-5.4) | $10.00 | $1.00 |
| [GPT-5.5](https://y-api.bestvirtualgoods.com/models/openai/gpt-5.5) | $20.00 | $2.00 |
| [GPT-5.4 Mini](https://y-api.bestvirtualgoods.com/models/openai/gpt-5.4-mini) | $3.05 | $0.305 |

[View LLM API pricing & billing](https://y-api.bestvirtualgoods.com/pricing)

## API integration examples

These minimal, text-only requests use the exact Y-API model ID. They do not demonstrate image, audio, video, file or tool support. The output limit also needs room for reasoning; an empty answer with finish_reason=length can mean the budget was exhausted.

Set the TOKEN environment variable to a key from your console. Run this on your server or locally; never expose a key in browser code or a public repository.

### A task to try

Bump this package to its next major version. Show the breaking changes that affect this repository, the edits you would make, and the tests that should change with them.

```bash
curl --fail-with-body --silent --show-error --max-time 120 \
  'https://api.y-api.bestvirtualgoods.com/v1/chat/completions' \
  -H "Authorization: Bearer ${TOKEN:?Set TOKEN first}" \
  -H 'Content-Type: application/json' \
  --data-binary @- <<'JSON'
{
  "model": "openai/gpt-5.4",
  "messages": [
    {
      "role": "user",
      "content": "Bump this package to its next major version. Show the breaking changes that affect this repository, the edits you would make, and the tests that should change with them."
    }
  ],
  "max_tokens": 4096
}
JSON
```

```python
import json
import os
import sys
import urllib.error
import urllib.request

payload = {
  "model": "openai/gpt-5.4",
  "messages": [
    {
      "role": "user",
      "content": "Bump this package to its next major version. Show the breaking changes that affect this repository, the edits you would make, and the tests that should change with them."
    }
  ],
  "max_tokens": 4096
}

request = urllib.request.Request(
    "https://api.y-api.bestvirtualgoods.com/v1/chat/completions",
    data=json.dumps(payload).encode("utf-8"),
    headers={
        "Authorization": "Bearer " + os.environ["TOKEN"],
        "Content-Type": "application/json",
    },
    method="POST",
)
try:
    with urllib.request.urlopen(request, timeout=120) as response:
        result = json.load(response)
    print(json.dumps(result, ensure_ascii=False, indent=2))
except urllib.error.HTTPError as error:
    print(error.read().decode("utf-8"), file=sys.stderr)
    raise SystemExit(1)
```

### How to evaluate the result

The answer should cite specific call sites in the provided code. A generic changelog summary with no reference to this repository has not done the migration.

## Before you choose

### Is GPT-5.4 still current after GPT-6 shipped?

It remains a separate catalog entry with its own price. Newer generations do not automatically retire older ones, but they do change which one is worth paying for — compare on your own task set.

## Sources & scope

Technical facts come from the cited model page and, where available, its linked publisher card. A card describes that checkpoint; it is not proof of the weights a gateway serves. Prices come only from the Y-API catalog. We do not claim measured latency, uptime or benchmark scores for this endpoint.

- [OpenRouter model page & specifications](https://openrouter.ai/openai/gpt-5.4)
- [Y-API catalog & prices (JSON)](https://y-api.bestvirtualgoods.com/models.json)

## Models to compare

Compare these alternatives on the same inputs. Their descriptions explain different roles; a lower price does not establish equivalent quality.

### [GPT-5.5](https://y-api.bestvirtualgoods.com/models/openai/gpt-5.5)

GPT-5.5 is the successor to 5.4 in OpenAI’s frontier line, listed with a 1,050,000-token window and file, image and text input. The reference describes stronger reasoning and better token efficiency on hard tasks.

### [GPT-5.4 Mini](https://y-api.bestvirtualgoods.com/models/openai/gpt-5.4-mini)

GPT-5.4 Mini is the smaller, faster member of the 5.4 generation, listed with a 400,000-token window and file, image and text input. The reference targets high-throughput workloads that need the 5.4 behaviour at lower cost.

## Links

- HTML version of this page: https://y-api.bestvirtualgoods.com/models/openai/gpt-5.4
- Site index for agents: https://y-api.bestvirtualgoods.com/llms.txt
- Full reference (single file): https://y-api.bestvirtualgoods.com/llms-full.txt
- OpenAPI 3.1 spec: https://y-api.bestvirtualgoods.com/openapi.json
- Model catalog (JSON, no key needed): https://y-api.bestvirtualgoods.com/models.json
- API base URL: `https://api.y-api.bestvirtualgoods.com/v1`
- Contact: support@bestvirtualgoods.com
- Model catalog: https://y-api.bestvirtualgoods.com/models
- Integration guide: https://y-api.bestvirtualgoods.com/docs