# OpenAI GPT-5.4 Mini API

> GPT-5.4 mini is the smaller, faster tier of OpenAI's GPT-5.4 family, released in March 2026 with text and image input and text output. OpenAI describes it as its strongest mini model at release for coding, computer use and subagents, bringing much of GPT-5.4's capability to high-volume workloads at more than twice the speed of GPT-5 mini. Pick it over full GPT-5.4 for responsive coding assistants and agent fleets, and over nano when tasks need computer use.

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

## Facts

- Provider: OpenAI
- Type: Language model
- Model ID: `openai/gpt-5.4-mini`
- Price: $0.75 per 1M input tokens, $4.50 per 1M output tokens
- Context window: 400K 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-mini",
  "input": "Hello",
  "max_output_tokens": 2048
}'
```

## FAQ

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

Create a SandBase API key, then send requests with the model ID "openai/gpt-5.4-mini" 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 Mini cost?

$0.75 per 1M input tokens and $4.50 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 Mini?

400K tokens of context, with up to 128K output tokens per response.

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

OpenAI GPT-5.4 Mini scores 24.1 on the Artificial Analysis Intelligence Index (v4.3), ranking #52 of 83 models on SandBase; Coding Index 56.1, Agentic Index 17.9. Source: Artificial Analysis, measured as GPT-5.4 mini (Xhigh).

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

OpenAI GPT-5.4 Mini 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 Mini and the other models in the catalog; you do not need to sign up with OpenAI separately.