Step 3.7 Flash vs Hy3 preview
Updated October 21, 2026. 8 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
Decision reading
Neither model has a coding score yet, so the two cannot be ranked on coding.
Step 3.7 Flash has the edge where what matters is AA Coding Index or AA Intelligence Index, where it leads.
- Shared results
- 8
- Step 3.7 Flash only
- 10
- Hy3 preview only
- 28
- Like-for-like categories
- 5 of 9
Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, six public coding benchmarks
No call
Neither has a coding score yet.
One side not measured
Intelligence
AA Intelligence Index
Hy3 preview
Hy3 preview leads, 25.3 against 19.5.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Hy3 preview has a AA Agentic Index result, 24.1.
Directional only
Web design
Design Arena: websites
No call
Only Step 3.7 Flash has a Design Arena: websites result, 1196.
Directional only
Long documents
Listed context window
No call
Both take 262K tokens.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Hy3 preview
Step 3.7 Flash $0.0008, Hy3 preview $0.0005 per turn.
List prices
At a glance
- Coding index
- Step 3.7 Flash not benchmarked, Hy3 preview not benchmarked.
- Widest category
- Coding, 10.4 points apart on average over 2 shared benchmarks.
- Widest single gap
- AA Coding Index: Step 3.7 Flash 39.6 against Hy3 preview 58.8, 19.2 points apart on a 0 to 100 scale.
- Output price
- Step 3.7 Flash $1.15 against Hy3 preview $0.60 per million output tokens, 1.9x apart.
- Context window
- Both take 262K tokens.
Benchmark by benchmark
First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.
| Category | Step 3.7 Flash | Bars | Hy3 preview | Ties |
|---|---|---|---|---|
| Coding | 1 | 1 | ||
| Intelligence | 0 | 1 | ||
| Agentic work | 1 | 0 | ||
| Reasoning | 0 | 2 | ||
| General | 2 | 0 | ||
| All shared boards | 4 | 4 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index11
| Benchmark | Step 3.7 Flash | Hy3 preview | Leader |
|---|---|---|---|
| LMArena WebDev | Not measured | 1357 | Only Hy3 preview measured |
| AA Coding Index | 39.6 | 58.8 | Hy3 preview |
| SciCode | 43.9% | Not measured | Only Step 3.7 Flash measured |
| Terminal-Bench Hard (Artificial Analysis run) | 35.6% | 34.1% | Step 3.7 Flash |
| ALE-Bench | 694.1 | Not measured | Only Step 3.7 Flash measured |
| LMArena Text: coding | Not measured | 1421 | Only Hy3 preview measured |
| LMArena Text: software and IT | Not measured | 1423 | Only Hy3 preview measured |
| LMArena WebDev: React | Not measured | 1349 | Only Hy3 preview measured |
| LMArena WebDev: HTML | Not measured | 1356 | Only Hy3 preview measured |
| Neither model has a result on the other 29 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Step 3.7 Flash | Hy3 preview | Leader |
|---|---|---|---|
| AA Intelligence Index | 19.5 | 25.3 | Hy3 preview |
| Neither model has a result on the other 1 board here | |||
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Step 3.7 Flash | Hy3 preview | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 24.1 | Only Hy3 preview measured |
| τ²-Bench Telecom | 98.5% | 92.7% | Step 3.7 Flash |
| Neither model has a result on the other 37 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | Step 3.7 Flash | Hy3 preview | Leader |
|---|---|---|---|
| GPQA Diamond (Artificial Analysis run) | 80.9% | 86.7% | Hy3 preview |
| Humanity's Last Exam (Artificial Analysis run) | 21.4% | 27.8% | Hy3 preview |
| LMArena Text: hard prompts | Not measured | 1413 | Only Hy3 preview measured |
| LMArena Text: expert | Not measured | 1422 | Only Hy3 preview measured |
| LMArena Text: hard prompts in English | Not measured | 1416 | Only Hy3 preview measured |
| Neither model has a result on the other 16 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
| Benchmark | Step 3.7 Flash | Hy3 preview | Leader |
|---|---|---|---|
| LMArena Text: math | Not measured | 1424 | Only Hy3 preview measured |
| LMArena Text: mathematical work | Not measured | 1442 | Only Hy3 preview measured |
| Neither model has a result on the other 11 boards here | |||
KnowledgeDirectional onlyPublic boards, shown as published, kept out of the index4 boards, none shared
| Benchmark | Step 3.7 Flash | Hy3 preview | Leader |
|---|---|---|---|
| LMArena Text: science | Not measured | 1416 | Only Hy3 preview measured |
| LMArena Text: medicine and healthcare | Not measured | 1405 | Only Hy3 preview measured |
| LMArena Text: legal and government | Not measured | 1430 | Only Hy3 preview measured |
| LMArena Text: business and finance | Not measured | 1397 | Only Hy3 preview measured |
| Neither model has a result on the other 13 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
| Benchmark | Step 3.7 Flash | Hy3 preview | Leader |
|---|---|---|---|
| Design Arena: websites | 1196 | Not measured | Only Step 3.7 Flash measured |
| Design Arena: UI components | 1179 | Not measured | Only Step 3.7 Flash measured |
| Design Arena: game dev | 1158 | Not measured | Only Step 3.7 Flash measured |
| Design Arena: data viz | 1172 | Not measured | Only Step 3.7 Flash measured |
| Design Arena: 3D | 1129 | Not measured | Only Step 3.7 Flash measured |
| Design Arena: all code categories | 1182 | Not measured | Only Step 3.7 Flash measured |
| Design Arena: SVG | 1085 | Not measured | Only Step 3.7 Flash measured |
| Design Arena: ASCII art | 1152 | Not measured | Only Step 3.7 Flash measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Step 3.7 Flash | Hy3 preview | Leader |
|---|---|---|---|
| IFBench | 67.3% | 63.1% | Step 3.7 Flash |
| Long context reasoning (AA-LCR) | 73.7% | 64.7% | Step 3.7 Flash |
| LMArena Text | Not measured | 1401 | Only Hy3 preview measured |
| LMArena Text: instruction following | Not measured | 1383 | Only Hy3 preview measured |
| LMArena Text: creative writing | Not measured | 1339 | Only Hy3 preview measured |
| LMArena Text: English | Not measured | 1409 | Only Hy3 preview measured |
| LMArena Text: non-English | Not measured | 1390 | Only Hy3 preview measured |
| LMArena Text: Chinese | Not measured | 1435 | Only Hy3 preview measured |
| LMArena Text: French | Not measured | 1425 | Only Hy3 preview measured |
| LMArena Text: Spanish | Not measured | 1399 | Only Hy3 preview measured |
| LMArena Text: Russian | Not measured | 1399 | Only Hy3 preview measured |
| LMArena Text: multi-turn | Not measured | 1411 | Only Hy3 preview measured |
| LMArena Text: longer queries | Not measured | 1402 | Only Hy3 preview measured |
| LMArena Text: writing and language | Not measured | 1370 | Only Hy3 preview measured |
| LMArena Text: entertainment and media | Not measured | 1352 | Only Hy3 preview measured |
| Neither model has a result on the other 31 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Step 3.7 Flash | Hy3 preview | Leader |
|---|---|---|---|
| Neither model has a result on 5 boards here | |||
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
Hy3 preview costs less
Repository review
50K input + 3K output tokens
Hy3 preview costs less
Agent loop
200K input + 10K output tokens
Hy3 preview costs less
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | StepFun Step 3.7 Flash | Tencent Hy3 preview |
|---|---|---|
| Maker | StepFun | Tencent |
| Weights | Open weights | Open weights |
| Released | May 28, 2026 | April 22, 2026 |
| Context window | 262K | 262K |
| Input $/Mtok | $0.20 | $0.18 |
| Output $/Mtok | $1.15 | $0.60 |
| Coding index | Not benchmarked | Not benchmarked |
| Independent measurements behind it | 0 | 1 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Step 3.7 Flash better than Hy3 preview for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. Step 3.7 Flash has the edge where what matters is AA Coding Index or AA Intelligence Index, where it leads.
Which is cheaper, Step 3.7 Flash or Hy3 preview?
Step 3.7 Flash costs $0.20 per million input tokens and $1.15 per million output tokens; Hy3 preview costs $0.18 and $0.60. Cost per solved task is known for neither of them.
Which has the bigger context window, Step 3.7 Flash or Hy3 preview?
Neither: both take 262K tokens.
How many benchmarks is the Step 3.7 Flash vs Hy3 preview comparison based on?
8 benchmarks have a result for both models as of October 21, 2026. Step 3.7 Flash's coding index rests on 0 independent benchmarks and Hy3 preview's on 1. Where only one model has a result, the page says so instead of naming a winner.