# OpenAI GPT-6 Luna Pro API

> GPT-6 Luna Pro is the same GPT-6 Luna model, OpenAI's most efficient GPT-6 tier, served in OpenAI's pro reasoning mode instead of standard mode. Pro mode spends more model work per request and returns one final answer, which OpenAI says can improve reliability on difficult tasks while raising latency and token usage. It suits occasional hard requests in a Luna-based workload; for routine, latency-sensitive or high-volume traffic, OpenAI recommends standard mode.

Source: https://www.sandbase.ai/models/openai/gpt-6-luna-pro
API reference: https://www.sandbase.ai/models/openai/gpt-6-luna-pro/docs

## Facts

- Provider: OpenAI
- Type: Language model
- Model ID: `openai/gpt-6-luna-pro`
- Price: $0.10 per 1M input tokens, $0.50 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-6-luna-pro",
  "input": "Hello",
  "max_output_tokens": 2048
}'
```

## FAQ

### How do I call OpenAI GPT-6 Luna Pro through SandBase?

Create a SandBase API key, then send requests with the model ID "openai/gpt-6-luna-pro" 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-6 Luna Pro cost?

$0.10 per 1M input tokens and $0.50 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-6 Luna Pro?

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

### Which features does OpenAI GPT-6 Luna Pro support?

OpenAI GPT-6 Luna Pro 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-6 Luna Pro and the other models in the catalog; you do not need to sign up with OpenAI separately.