Step 3.7 Flash vs HY3
Step 3.7 Flash is from StepFun, released May 29, 2026. HY3 is from Tencent.
- Input per 1M$0.20 vs $0.13. HY3 costs 35% less per million input tokens.
- Output per 1M$1.15 vs $0.53. HY3 costs 54% less per million output tokens.
- Context window256k vs 262k. HY3 takes 2.4% more context in one request.
Prices are the vendors’ published API rates; Elo is LMArena’s text board. Each figure is dated on its model page.
Interactive Comparison
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$0.20 / $1.15 per million tokens | $0.13 / $0.53 per million tokens | |
|---|---|---|
| Identity | ||
| Developer | StepFun | Tencent |
| Released | May 2026 | — |
| Licence | Apache 2.0 (open weights) | Apache 2.0 |
| Self-hostable | Yes — stepfun-ai/Step-3.7-Flash on Hugging Face | Yes |
| Cost | ||
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $0.438 / 1M tokens | $0.230 / 1M tokens |
| Input price | $0.200 / 1M tokens | $0.130 / 1M tokens |
| Output price | $1.150 / 1M tokens | $0.530 / 1M tokens |
| Cached input | $0.04 / 1M tokens | — |
| Capacity | ||
| Context window | 256K tokens | 262.1K tokens |
| Capability | ||
| Vision in | Yes — images and video | — |
| Function calling | Yes | — |
| Extended reasoning | Yes — three reasoning-effort levels | — |
| Access | ||
| API | Yes — StepFun Open Platform (step-3.7-flash) | — |
| Measured quality | ||
| LMArena Elo | — | 1454 (checked Oct 2026) |
| LMArena rank | — | Rank 74 |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | — | 6322 |
