# OpenAI GPT-5.2 API

> GPT-5.2 is OpenAI's GPT-5 series flagship released in December 2025, positioned by OpenAI for complex professional work and long-running agents, with text and image input and text output. It offers configurable reasoning effort from none up to an extra-high setting, and OpenAI highlights its performance on well-specified knowledge work across dozens of occupations alongside coding and tool use. OpenAI now calls it a previous flagship, with GPT-5.4 following it.

Source: https://www.sandbase.ai/models/openai/gpt-5.2
API reference: https://www.sandbase.ai/models/openai/gpt-5.2/docs

## Facts

- Provider: OpenAI
- Type: Language model
- Model ID: `openai/gpt-5.2`
- Price: $1.75 per 1M input tokens, $14 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-5.2",
  "input": "Hello",
  "max_output_tokens": 2048
}'
```

## FAQ

### How do I call OpenAI GPT-5.2 through SandBase?

Create a SandBase API key, then send requests with the model ID "openai/gpt-5.2" 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-5.2 cost?

$1.75 per 1M input tokens and $14 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-5.2?

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

### How does OpenAI GPT-5.2 score on benchmarks?

OpenAI GPT-5.2 scores 30.4 on the Artificial Analysis Intelligence Index (v4.3), ranking #40 of 83 models on SandBase. Source: Artificial Analysis, measured as GPT-5.2 (Xhigh).

### Which features does OpenAI GPT-5.2 support?

OpenAI GPT-5.2 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-5.2 and the other models in the catalog; you do not need to sign up with OpenAI separately.