StepFun: Step 3.5 Flash
Released Jan 29, 2026Ranked in:Text
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Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....
Best overall rank
#129
▼ 1 vs 7d ago
Total arena votes
348,677
Across 29 (subset, category) entries
Providers on OR
1
SiliconFlow
First seen
2026-05-08
61 days tracked
Trend
Pricing
Per token
- Input (per 1M)
- $0.100
- Output (per 1M)
- $0.300
Capabilities
Modality
text->textContext
262K tokens
Tokenizer
Other
Max output
66K tokens
Moderation
Unmoderated
Hugging Face
Supported parameters
frequency_penalty
include_reasoning
max_tokens
reasoning
temperature
tool_choice
tools
top_k
top_p
Providers
| Provider | Region / Tag | Context | Input/M | Output/M | Uptime 1d | Latency | Quant | Cache |
|---|---|---|---|---|---|---|---|---|
| SiliconFlow | siliconflow/fp8 | 262K | $0.100 | $0.300 | - | - | fp8 | - |
Per-category ranks
Text
| Rank | Category | Variant | Trend | Elo | Votes |
|---|---|---|---|---|---|
| #94 | Spanish | - | 1406 | 1,672 | |
| #97 | Industry Mathematical | - | 1422 | 2,657 | |
| #100 | Expert | - | 1434 | 4,271 | |
| #102 | Japanese | - | 1344 | 554 | |
| #109 | Math | - | 1408 | 3,006 | |
| #113 | Chinese | - | 1437 | 2,492 | |
| #114 | Coding | - | 1450 | 13,017 | |
| #114 | French | - | 1415 | 1,684 | |
| #114 | Korean | - | 1338 | 897 | |
| #116 | German | - | 1380 | 936 | |
| #117 | Industry Software And It Services | - | 1437 | 19,620 | |
| #122 | Longer Query | - | 1407 | 18,853 | |
| #123 | Hard Prompts English | - | 1425 | 14,793 | |
| #123 | Instruction Following | - | 1387 | 16,260 | |
| #125 | Multi Turn | - | 1396 | 9,100 | |
| #126 | English | - | 1411 | 23,142 | |
| #129 | Exclude Ties | - | 1373 | 38,015 | |
| #129 | Overall | - | 1395 | 52,274 | |
| #132 | Non English | - | 1375 | 29,129 | |
| #133 | Hard Prompts | - | 1413 | 32,007 | |
| #133 | Industry Business And Management And Financial Operations | - | 1389 | 10,182 | |
| #135 | Industry Life And Physical And Social Science | - | 1406 | 8,342 | |
| #136 | Russian | - | 1376 | 5,970 | |
| #137 | Industry Writing And Literature And Language | - | 1366 | 12,551 | |
| #138 | Industry Entertainment And Sports And Media | - | 1350 | 10,165 | |
| #139 | Polish | - | 1362 | 1,199 | |
| #141 | Creative Writing | - | 1348 | 8,286 | |
| #143 | Industry Legal And Government | - | 1393 | 3,977 | |
| #145 | Industry Medicine And Healthcare | - | 1399 | 3,626 |