# Step 5 Preview vs omen-alpha - AI Model Comparison

- Page: https://opencode.ai/data/compare/stepfun/step-5-preview/unknown/omen-alpha
- Updated: 2026-10-27T12:48:56.000Z

|  | Step 5 Preview | omen-alpha |
| --- | --- | --- |
| Lab | StepFun | Unknown |
| Context window | 1M | - |
| Max output | 1M | - |
| Input modalities | text, image, video | - |
| Reasoning | Yes | - |
| Tool calling | Yes | - |
| Open weights | Yes | - |
| Release date | 2026-09-16 | - |
| Input price per 1M tokens | $1.00 | - |
| Output price per 1M tokens | $2.70 | - |
| Cached input price per 1M tokens | $0.05 | - |
| OpenCode tokens: past 2 months | 7.2T | 2.3T |
| Share of all tokens | 0.6% | 0.2% |
| Rank by tokens last week | #34 | #36 |
| Unique users | 117K | 90K |
| Weekly retention | 58.8% | 63.4% |

Model pages: [Step 5 Preview](https://opencode.ai/data/stepfun/step-5-preview.md), [omen-alpha](https://opencode.ai/data/unknown/omen-alpha.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.