StepFun: Step 3.5 Flash
Released Jan 29, 2026text→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
#136
▼ 2 vs 7d ago
Total arena votes
360,145
Across 29 (subset, category) entries
Providers on OR
1
SiliconFlow
First seen
2026-05-08
72 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 | 100.00% | - | fp8 | - |
Per-category ranks
Text
| Rank | Category | Variant | Trend | Elo | Votes |
|---|---|---|---|---|---|
| #96 | Spanish | - | 1408 | 1,717 | |
| #101 | Japanese | - | 1347 | 581 | |
| #103 | Industry Mathematical | - | 1420 | 2,717 | |
| #107 | Expert | - | 1432 | 4,444 | |
| #114 | Math | - | 1407 | 3,074 | |
| #119 | German | - | 1381 | 966 | |
| #120 | Chinese | - | 1436 | 2,559 | |
| #120 | Coding | - | 1450 | 13,482 | |
| #121 | French | - | 1414 | 1,770 | |
| #121 | Korean | - | 1338 | 957 | |
| #123 | Industry Software And It Services | - | 1437 | 20,285 | |
| #123 | Non English | - | 1386 | 30,114 | |
| #129 | Longer Query | - | 1407 | 19,496 | |
| #130 | Hard Prompts English | - | 1426 | 15,253 | |
| #131 | Instruction Following | - | 1388 | 16,842 | |
| #131 | Multi Turn | - | 1397 | 9,321 | |
| #133 | English | - | 1410 | 23,834 | |
| #135 | Exclude Ties | - | 1374 | 39,266 | |
| #136 | Overall | - | 1395 | 53,963 | |
| #139 | Hard Prompts | - | 1414 | 33,047 | |
| #140 | Industry Business And Management And Financial Operations | - | 1389 | 10,492 | |
| #140 | Polish | - | 1363 | 1,238 | |
| #141 | Russian | - | 1376 | 6,152 | |
| #142 | Industry Life And Physical And Social Science | - | 1406 | 8,634 | |
| #144 | Industry Writing And Literature And Language | - | 1366 | 12,996 | |
| #147 | Industry Entertainment And Sports And Media | - | 1349 | 10,557 | |
| #148 | Creative Writing | - | 1347 | 8,569 | |
| #149 | Industry Legal And Government | - | 1394 | 4,100 | |
| #150 | Industry Medicine And Healthcare | - | 1399 | 3,719 |