# GPT-5.6 Terra

> OpenAI's balanced GPT-5.6 tier, between the Sol flagship and the Luna cost tier. 1M context, accepts text, images and files.

Human version: https://kymaapi.com/models/gpt-5.6-terra
Live JSON: `GET https://kymaapi.com/v1/models` (no auth required)

## Facts

- **Model ID**: `gpt-5.6-terra` — pass this as `model` in the request body
- **Creator**: OpenAI
- **Released**: 2026-07-09
- **Context window**: 1M tokens
- **Max output**: 8K tokens per response — a hard ceiling, not a default
- **Price**: $1.443 in / $8.656 out per 1M, cached input 10%
- **Capabilities**: tools, vision, reasoning, caching

## Call it

```bash
curl https://kymaapi.com/v1/chat/completions \
  -H "Authorization: Bearer $KYMA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "gpt-5.6-terra", "messages": [{"role": "user", "content": "Hello"}]}'
```

## Positioning

GPT-5.6 Terra is OpenAI’s balanced tier, positioned between the high-capability Sol and the budget-focused Luna. It targets developers who need reliable reasoning, tool use, and vision support for everyday coding and agentic workflows without flagship pricing.

## About

This frontier-class model accepts text and image inputs and returns text. It supports tool calling, extended reasoning, structured outputs, and prompt caching. With a 1,050,000-token context window and an 8,192-token maximum output, it handles long documents and multi-step tasks.

On Kyma, the model runs through an OpenAI-compatible endpoint using a single API key. Requests benefit from automatic failover, and the response headers include the exact model that executed the prompt via X-Kyma-Model. Usage costs are returned in the usage.cost field, and repeated prompt prefixes are billed at 10% of the input rate when caching is active.

The model operates at a medium speed tier and a premium cost tier. It does not support audio or video inputs, and the maximum output length is capped at 8,192 tokens, which restricts very long-form generation tasks.

## Use cases

- **Everyday Code Generation** — Handles routine scripting, refactoring, and debugging tasks with reliable tool integration.
- **Multi-Step Agent Workflows** — Executes chained function calls and maintains state across complex operational loops.
- **Technical Document Analysis** — Processes long text and image inputs within a million-token context window.
- **Interactive Chat Applications** — Delivers consistent conversational responses with structured output formatting.

## Not ideal for

It is not suited for high-throughput batch processing or tasks requiring ultra-low latency, as it operates at a medium speed tier and premium cost tier.

## Pick something else when

- You need faster, lower-cost inference for simple prompts → `gemini-3.6-flash`
- You need deeper reasoning for complex research or math → `deepseek-r1`
- You need specialized code generation and repository-level tasks → `qwen-3-coder`

## See also

- All models: https://kymaapi.com/models.md
- Pricing: https://kymaapi.com/pricing.md
- Other models by OpenAI: https://kymaapi.com/models?q=OpenAI