---
id: "42"
slug: "gpt-5-4-models"
date: "2026-03-06"
title: "GPT-5.4 and GPT-5.4 Pro Now Available"
summary: "Access OpenAI's most capable models — GPT-5.4 for complex professional work and GPT-5.4 Pro for smarter, more precise responses — with 1.05M context windows and reasoning support."
image:
  src: "/changelog/gpt-5-models.png"
  alt: "GPT-5.4 and GPT-5.4 Pro models now available on LLM Gateway"
  width: 1768
  height: 677
---

OpenAI's **GPT-5.4** and **GPT-5.4 Pro** are now available on LLM Gateway. Both models feature a massive 1,050,000-token context window, 128K max output tokens, and reasoning support.

## New Models

### **GPT-5.4** — Frontier Model for Professional Work

```bash
openai/gpt-5.4
```

- **Context Window**: 1,050,000 tokens
- **Max Output**: 128,000 tokens
- **Pricing**: $2.50 per 1M input tokens / $15.00 per 1M output tokens
- **Cached Input**: $0.25 per 1M tokens
- **Knowledge Cutoff**: August 31, 2025
- Reasoning support with effort levels: none (default), low, medium, high, xhigh
- Vision, tool calling, web search, and JSON output support

### **GPT-5.4 Pro** — Smarter and More Precise

```bash
openai/gpt-5.4-pro
```

- **Context Window**: 1,050,000 tokens
- **Max Output**: 128,000 tokens
- **Pricing**: $30.00 per 1M input tokens / $180.00 per 1M output tokens
- **Knowledge Cutoff**: August 31, 2025
- Uses more compute for consistently better answers on tough problems
- Reasoning support with effort levels: medium, high, xhigh
- Available via Responses API only

## Getting Started

Both models are available immediately through the unified API:

```bash
curl -X POST https://api.llmgateway.io/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.4",
    "messages": [{"role": "user", "content": "Hello GPT-5.4!"}]
  }'
```

```javascript
import { llmgateway } from "@llmgateway/ai-sdk-provider";
import { generateText } from "ai";

const { text } = await generateText({
  model: llmgateway("openai/gpt-5.4"),
  prompt: "Analyze this complex document...",
});
```
