# GPT-5.6 Terra

> OpenAI's balanced model for work that needs real reasoning at a moderate price, with a 1.05M-token window.

## Key facts

- Model author: OpenAI
- Input: $1.8422 per 1M tokens (starting tier)
- Output: $11.0533 per 1M tokens (starting tier)
- Cached input: $0.1842 per 1M tokens
- Context window: 1,050,000 tokens
- Maximum output: 128,000 tokens
- Input modalities: image, text
- Output modalities: text
- Capabilities: apply_patch, code_interpreter, computer_use, file_search, hosted_shell, image_generation, reasoning, structured_output, tools, vision, web_search
- Released: 2026-07-09
- Knowledge cutoff: Feb 16, 2026
- Model IDs: `jd/gpt-5.6-terra`, `openai/gpt-5.6-terra`
- Model page: https://www.realrelay.ai/model/openai/gpt-5.6-terra

## Overview

GPT-5.6 Terra is a model from OpenAI designed to balance intelligence and price. It accepts text and image input, returns text, and supports reasoning, tool calling, structured output, web search and computer use, with a 1.05M-token context window, making it a practical choice for everyday production workloads that need reasoning.

It has a 1.05M-token context window and can generate up to 128,000 output tokens. It accepts text and image input and returns text. Its knowledge cutoff is February 16, 2026, and it was released on July 9, 2026.

## Capabilities

GPT-5.6 Terra supports reasoning, tool calling, structured output and image input, and returns text output. Its listed tools also include web search, file search, a code interpreter, computer use, image generation, patch-based code editing and a hosted shell.

OpenAI documents GPT-5.6 Terra as a model that balances intelligence and price.

## Pricing

GPT-5.6 Terra costs from $1.84 per 1M input tokens and from $11.05 per 1M output tokens. Cached input reads cost from $0.184 per 1M tokens. Pricing is tiered, and the prices shown are the starting tier. GPT-5.6 Terra is available through RealRelay's OpenAI-compatible API.

## Use cases

Use GPT-5.6 Terra for everyday coding and agent workloads that need real reasoning at a balanced price, such as code review assistants and tool-calling support agents.

With image input and structured output it can read screenshots or documents and return fields that downstream systems parse, across the 1.05M-token window. Web search and computer use extend it to tasks that need information or actions outside the prompt.

## Call it

OpenAI-compatible chat completions:

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

## FAQ

### What is GPT-5.6 Terra?

GPT-5.6 Terra is a model from OpenAI designed to balance intelligence and price.

### How much does GPT-5.6 Terra cost?

GPT-5.6 Terra costs from $1.84 per 1M input tokens and from $11.05 per 1M output tokens. Cached input reads cost from $0.184 per 1M tokens. Pricing is tiered, and the prices shown are the starting tier.

### What is the context window of GPT-5.6 Terra?

GPT-5.6 Terra has a 1.05M-token context window and can generate up to 128,000 output tokens.

### What inputs and outputs does GPT-5.6 Terra support?

GPT-5.6 Terra accepts text and image input and returns text.

### Does GPT-5.6 Terra support tool calling?

Yes. GPT-5.6 Terra supports tool calling, along with reasoning, structured output and image input.

### When was GPT-5.6 Terra released?

GPT-5.6 Terra was released on July 9, 2026. Its knowledge cutoff is February 16, 2026.

### How do I call GPT-5.6 Terra via the API?

Call GPT-5.6 Terra through RealRelay's OpenAI-compatible API by setting the model name to openai/gpt-5.6-terra.