# OpenAI GPT-5.6 Sol API

> GPT-5.6 Sol is the flagship tier of OpenAI's GPT-5.6 reasoning family, accepting text and image input; OpenAI says it roughly corresponds to the unsuffixed tier of earlier GPT-5 families, and the plain GPT-5.6 name routes to it. OpenAI positions it for complex professional work, including coding, knowledge work, cybersecurity and science. Pick it over GPT-5.6 Terra or Luna when tasks need the most capability in this family, or the Sol Pro variant for the hardest requests.

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

## Facts

- Provider: OpenAI
- Type: Language model
- Model ID: `openai/gpt-5.6-sol`
- Price: $3.60 per 1M input tokens, $18 per 1M output tokens (10% off list price)
- 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",
  "input": "Hello",
  "max_output_tokens": 2048
}'
```

## FAQ

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

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

$3.60 per 1M input tokens and $18 per 1M output tokens with the current 10% discount (list price $4 / $20), billed per request from your SandBase balance.

### What is the context window of OpenAI GPT-5.6 Sol?

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

### How does OpenAI GPT-5.6 Sol score on benchmarks?

OpenAI GPT-5.6 Sol scores 47.0 on the Artificial Analysis Intelligence Index (v4.3), ranking #9 of 83 models on SandBase; Coding Index 77.4, Agentic Index 50.2. Source: Artificial Analysis, measured as GPT-5.6 Sol (Max).

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

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