# Claude Sonnet 5.5 vs Kimi K3 - AI Model Comparison

- Page: https://opencode.ai/data/compare/anthropic/claude-sonnet-5-5/moonshotai/kimi-k3
- Updated: 2026-10-22T23:24:50.000Z

|  | Claude Sonnet 5.5 | Kimi K3 |
| --- | --- | --- |
| Lab | Anthropic | Moonshot |
| Context window | 1M | 1M |
| Max output | 128K | 131K |
| Input modalities | text, image, pdf | text, image, video |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Open weights | No | Yes |
| Release date | 2026-09-28 | 2026-07-16 |
| Input price per 1M tokens | $2.00 | $3.45 |
| Output price per 1M tokens | $10.00 | $17.25 |
| Cached input price per 1M tokens | - | - |
| OpenCode tokens: past 2 months | - | 571B |
| Share of all tokens | - | 0.1% |
| Rank by tokens last week | - | #29 |
| Unique users | - | 254K |
| Weekly retention | - | 42.1% |

Model pages: [Claude Sonnet 5.5](https://opencode.ai/data/anthropic/claude-sonnet-5-5.md), [Kimi K3](https://opencode.ai/data/moonshotai/kimi-k3.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.