# gemini-4-argon-contributor vs GPT-5.6 Luna - AI Model Comparison

- Page: https://opencode.ai/data/compare/google/gemini-4-argon-contributor/openai/gpt-5-6-luna
- Updated: 2026-10-16T21:31:22.000Z

|  | gemini-4-argon-contributor | GPT-5.6 Luna |
| --- | --- | --- |
| Lab | Google | OpenAI |
| Context window | - | 1.1M |
| Max output | - | 128K |
| Input modalities | - | text, image, pdf |
| Reasoning | - | Yes |
| Tool calling | - | Yes |
| Open weights | - | No |
| Release date | - | 2026-07-09 |
| 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 | 74B | 3.4T |
| Share of all tokens | 0.0% | 0.3% |
| Rank by tokens last week | #26 | #22 |
| Unique users | 9.8K | 408K |
| Weekly retention | - | 58.3% |

Model pages: [gemini-4-argon-contributor](https://opencode.ai/data/google/gemini-4-argon-contributor.md), [GPT-5.6 Luna](https://opencode.ai/data/openai/gpt-5-6-luna.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.