# GPT-5.6 Luna vs Inkling 2 Small - AI Model Comparison

- Page: https://opencode.ai/data/compare/openai/gpt-5-6-luna/thinkingmachines/inkling-2-small
- Updated: 2026-11-07T08:11:26.000Z

|  | GPT-5.6 Luna | Inkling 2 Small |
| --- | --- | --- |
| Lab | OpenAI | Thinking Machines |
| Context window | 1.1M | 1M |
| Max output | 128K | 131K |
| Input modalities | text, image, pdf | text, image |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Open weights | No | No |
| Release date | 2026-07-09 | 2026-11-05 |
| Input price per 1M tokens | $0.20 | - |
| Output price per 1M tokens | $1.20 | - |
| Cached input price per 1M tokens | $0.02 | - |
| OpenCode tokens: past 2 months | 1.9T | 57B |
| Share of all tokens | 0.1% | 0% |
| Rank by tokens last week | #27 | #30 |
| Unique users | 266K | 397 |
| Weekly retention | 52.5% | - |

Model pages: [GPT-5.6 Luna](https://opencode.ai/data/openai/gpt-5-6-luna.md), [Inkling 2 Small](https://opencode.ai/data/thinkingmachines/inkling-2-small.md)

## Methodology

- Updates: Aggregated every hour. Days and weeks use UTC.
- Tokens: Input, output, reasoning, and cached tokens for each request.
- Users and sessions: Approximate counts of distinct users and OpenCode sessions.
- Cost: Session cost is the average cost per OpenCode session. Token prices are list prices from the OpenCode model catalog.
- Retention: The share of a model's users in one week who use it again the next week.
- Citation: Cite OpenCode Data (opencode.ai/data) with the update time shown at the top of the page.