# GPT-5.6 Luna

> A cost-efficient GPT-5.6 model optimized for high-volume reasoning and tool-use workloads.

Agent resources: the index of everything machine-readable is https://www.ohmygpt.com/llms.txt; the integration skill (endpoints, auth, SDK and coding-tool setup) is https://www.ohmygpt.com/skill.md.

- Model ID: `openai/gpt-5.6-luna`
- Live status and providers as JSON, no key needed: https://api.ohmygpt.com/v1/models/openai/gpt-5.6-luna
- Released: 2026-07-09
- Context: 1.1M tokens
- Max output: 128K tokens
- Input: text, image; output: text
- Knowledge cutoff: 2026-02-16
- Capability score: 157 (as of 2026-11-10, see https://www.ohmygpt.com/rankings.md)
- Human preference rating (LMArena text): 1431

## Prices (USD)

| Item | Price | Unit |
| --- | --- | --- |
| Input | $0.18–$0.36 | per 1M tokens |
| Output | $1.08–$1.62 | per 1M tokens |
| Cache read | $0.018–$0.036 | per 1M tokens |
| Cache write (5 min) | $0.225–$0.45 | per 1M tokens |
| Cache write (1 hour) | $0.45–$0.90 | per 1M tokens |
| Web search | $0.009–$0.0126 | per request |

## Providers

This model chooses its provider itself; a provider prefix is not accepted.

| Provider | Pinned model ID | Location | Input | Output | Trains on your data |
| --- | --- | --- | --- | --- | --- |
| Azure AI Foundry | — | Global | $0.18–$0.36 | $1.08–$1.62 | no |
| OpenAI | — | United States | $0.18–$0.36 | $1.08–$1.62 | no |

## Endpoints

| API | Request | model |
| --- | --- | --- |
| OpenAI Chat | POST https://api.ohmygpt.com/v1/chat/completions | `openai/gpt-5.6-luna` |
| OpenAI Responses | POST https://api.ohmygpt.com/v1/responses | `openai/gpt-5.6-luna` |
| Anthropic Messages | POST https://api.ohmygpt.com/v1/messages | `openai/gpt-5.6-luna` |
| Google Gemini | POST https://api.ohmygpt.com/v1/models/openai/gpt-5.6-luna:generateContent | `openai/gpt-5.6-luna` |

## Example

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

Web page: https://www.ohmygpt.com/models/openai/gpt-5.6-luna