# OpenAI GPT-5.6 Sol Pro API

> GPT-5.6 Sol Pro is the same GPT-5.6 Sol model, the flagship of OpenAI's GPT-5.6 family, served in OpenAI's pro reasoning mode rather than as a separate model. Pro mode spends more model work on each request before returning one final answer, which OpenAI recommends for complex optimization, high-value coding or review, and deep analysis. It brings higher latency and token usage, so standard Sol remains the better choice for routine or latency-sensitive work.

Source: https://www.sandbase.ai/model/openai/gpt-5.6-sol-pro
API reference: https://www.sandbase.ai/model/openai/gpt-5.6-sol-pro/docs

## Facts

- Provider: OpenAI
- Type: Language model
- Model ID: `openai/gpt-5.6-sol-pro`
- Price: $4 per 1M input tokens, $20 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-5.6-sol-pro",
  "input": "Hello",
  "max_output_tokens": 2048
}'
```

## FAQ

### How do I call OpenAI GPT-5.6 Sol Pro through SandBase?

Create a SandBase API key, then send requests with the model ID "openai/gpt-5.6-sol-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-5.6 Sol Pro cost?

$4 per 1M input tokens and $20 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-5.6 Sol Pro?

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

### Which features does OpenAI GPT-5.6 Sol Pro support?

OpenAI GPT-5.6 Sol 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-5.6 Sol Pro and the other models in the catalog; you do not need to sign up with OpenAI separately.