# GPT-5.6 Luna vs GLM-5.3 - AI Model Comparison

- Page: https://opencode.ai/data/compare/openai/gpt-5-6-luna/zhipuai/glm-5-3
- Updated: 2026-10-02T09:36:21.000Z

|  | GPT-5.6 Luna | GLM-5.3 |
| --- | --- | --- |
| Lab | OpenAI | Zhipu |
| Context window | 1.1M | 1M |
| Max output | 128K | 131K |
| Input modalities | text, image, pdf | text |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Open weights | No | Yes |
| Release date | 2026-07-09 | 2026-08-14 |
| Input price per 1M tokens | $0.20 | $1.40 |
| Output price per 1M tokens | $1.20 | $4.40 |
| Cached input price per 1M tokens | $0.02 | $0.26 |
| OpenCode tokens: past 2 months | 6.4T | 1.4T |
| Share of all tokens | 0.7% | 0.2% |
| Rank by tokens last week | #18 | #23 |
| Unique users | 602K | 325K |
| Weekly retention | 55.0% | 53.6% |

Model pages: [GPT-5.6 Luna](https://opencode.ai/data/openai/gpt-5-6-luna.md), [GLM-5.3](https://opencode.ai/data/zhipuai/glm-5-3.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.