# GPT-5.6 Terra

> OpenAI's GPT-5.6 Terra, a reasoning-focused model in the GPT-5.6 family that balances intelligence and cost, with a 1M+ token context window and tool-use support via the Responses API.

**ID**: `openai/gpt-5.6-terra`  
**Creator**: OpenAI  
**Category**: text  
**Context**: 1.1M tokens  
**Pricing**: $2.00 / $12.00 per 1M · billed by your provider (BYOK)  
**Released**: 2026-07-01  
**Web page**: https://anyrouter.dev/model/openai/gpt-5.6-terra

**Input modalities**: text  
**Output modalities**: text  

**Capabilities**: chat, reasoning, streaming, function-calling

## Usage

**Endpoint**: `POST https://anyrouter.dev/api/v1/chat/completions`

```bash
curl https://anyrouter.dev/api/v1/chat/completions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "openai/gpt-5.6-terra",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'
```

## Providers

| Provider | Input | Output |
| --- | --- | --- |
| openai-byok | $2.00/M (list) | $12.00/M (list) |
| opencode-zen-byok | $2.00/M (list) | $12.00/M (list) |
| openrouter-byok | $2.00/M (list) | $12.00/M (list) |
| router-byok | $2.00/M (list) | $12.00/M (list) |
| vercel-byok | $2.00/M (list) | $12.00/M (list) |

BYOK routes are billed by your own provider key — AnyRouter charges $0. Rates marked (list) are the provider's published list price.

## Benchmarks

- **GPQA Diamond**: 0.9
- **HLE**: 0.4
- **τ²-Bench Telecom**: 0.8
- **SciCode**: 0.5
- **OTIS Mock AIME**: 1.0
- **SimpleQA (verified)**: 0.4

Benchmark data from [Epoch AI](https://epoch.ai/benchmarks) (CC-BY 4.0).

## Source

- Upstream docs: https://developers.cloudflare.com/ai/models/openai/gpt-5.6-terra/