# OpenAI GPT-5.4 API

> GPT-5.4 is OpenAI's flagship GPT-5.4 reasoning model for complex professional work, released in March 2026 with text and image input, text output and a context window of about 1.05M tokens. OpenAI positions it for coding, professional knowledge work and multi-step agent workflows, with configurable reasoning effort and broad tool support including web search, code interpreter, computer use and MCP. Choose it over GPT-5.4 mini or nano when task depth matters more than speed.

Source: https://www.sandbase.ai/models/openai/gpt-5.4
API reference: https://www.sandbase.ai/models/openai/gpt-5.4/docs

## Facts

- Provider: OpenAI
- Type: Language model
- Model ID: `openai/gpt-5.4`
- Price: $2.50 per 1M input tokens, $15 per 1M output tokens
- Context window: 1.1M tokens, up to 128K output tokens
- Capabilities: chat, vision, reasoning, structured output, function calling
- Billing: pay per use from one SandBase balance; no provider account or subscription needed

## Call it

- Responses API: `POST https://api.sandbase.ai/v1/responses`
- Chat Completions API: `POST https://api.sandbase.ai/v1/chat/completions`

```bash
curl -X POST https://api.sandbase.ai/v1/responses \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "openai/gpt-5.4",
  "input": "Hello",
  "max_output_tokens": 2048
}'
```

## FAQ

### How do I call OpenAI GPT-5.4 through SandBase?

Create a SandBase API key, then send requests with the model ID "openai/gpt-5.4" to Responses API (/v1/responses) or Chat Completions API (/v1/chat/completions) at https://api.sandbase.ai. The request examples on this page show the exact payload.

### How much does OpenAI GPT-5.4 cost?

$2.50 per 1M input tokens and $15 per 1M output tokens, billed per request from your SandBase balance. Discounts, when available, are shown in the pricing on this page.

### What is the context window of OpenAI GPT-5.4?

1.1M tokens of context, with up to 128K output tokens per response.

### How does OpenAI GPT-5.4 score on benchmarks?

OpenAI GPT-5.4 scores 39.0 on the Artificial Analysis Intelligence Index (v4.3), ranking #24 of 83 models on SandBase; Coding Index 71.1. Source: Artificial Analysis, measured as GPT-5.4 (Xhigh).

### Which features does OpenAI GPT-5.4 support?

OpenAI GPT-5.4 supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.

### Do I need a separate OpenAI account?

No. One SandBase API key and balance gives you access to OpenAI GPT-5.4 and the other models in the catalog; you do not need to sign up with OpenAI separately.