# Beam 1.0 501B A23B vs Step 5 Preview - AI Model Comparison

- Page: https://opencode.ai/data/compare/reflection/beam-1-0-501b-a23b/stepfun/step-5-preview
- Updated: 2026-10-23T19:54:54.000Z

|  | Beam 1.0 501B A23B | Step 5 Preview |
| --- | --- | --- |
| Lab | Reflection | StepFun |
| Context window | 1M | 1M |
| Max output | 131K | 1M |
| Input modalities | text | text, image, video |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Open weights | Yes | Yes |
| Release date | 2026-10-05 | 2026-09-16 |
| Input price per 1M tokens | $0.30 | $1.00 |
| Output price per 1M tokens | $1.00 | $2.70 |
| Cached input price per 1M tokens | $0.04 | $0.05 |
| OpenCode tokens: past 2 months | 6.6T | 7.2T |
| Share of all tokens | 0.6% | 0.6% |
| Rank by tokens last week | #6 | #26 |
| Unique users | 127K | 114K |
| Weekly retention | - | 77.1% |

Model pages: [Beam 1.0 501B A23B](https://opencode.ai/data/reflection/beam-1-0-501b-a23b.md), [Step 5 Preview](https://opencode.ai/data/stepfun/step-5-preview.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.