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
#121
▼ 2 vs 7d ago
Total arena votes
204,646
Across 27 (subset, category) entries
Providers on OR
2
DeepInfra + others
First seen
2026-05-08
26 days tracked
Trend
Pricing
Per token
- Input (per 1M)
- $0.090
- Output (per 1M)
- $0.300
- Cache Read (per 1M)
- $0.020
Capabilities
Modality
text->textContext
262K tokens
Tokenizer
Other
Max output
16K tokens
Moderation
Unmoderated
Hugging Face
Supported parameters
frequency_penalty
include_reasoning
logit_bias
max_tokens
min_p
presence_penalty
reasoning
repetition_penalty
response_format
seed
stop
temperature
tool_choice
tools
top_k
top_p
Providers
| Provider | Region / Tag | Context | Input/M | Output/M | Uptime 1d | Latency | Quant | Cache |
|---|---|---|---|---|---|---|---|---|
| DeepInfra | deepinfra/fp8 | 262K | $0.090 | $0.300 | 99.45% | - | fp8 | - |
| SiliconFlow | siliconflow/fp8 | 262K | $0.100 | $0.300 | 98.14% | - | fp8 | - |
Per-category ranks
Text
| Rank | Category | Variant | Trend | Elo | Votes |
|---|---|---|---|---|---|
| #89 | Industry Mathematical | - | 1421 | 1,747 | |
| #90 | Spanish | - | 1404 | 1,095 | |
| #96 | Japanese | - | 1338 | 291 | |
| #97 | Expert | - | 1429 | 2,704 | |
| #101 | Math | - | 1406 | 2,146 | |
| #102 | French | - | 1421 | 948 | |
| #107 | Coding | - | 1447 | 8,364 | |
| #108 | Industry Software And It Services | - | 1436 | 12,786 | |
| #109 | German | - | 1381 | 607 | |
| #112 | Chinese | - | 1430 | 1,592 | |
| #112 | Korean | - | 1333 | 580 | |
| #113 | Longer Query | - | 1407 | 11,283 | |
| #114 | Instruction Following | - | 1387 | 10,231 | |
| #115 | Hard Prompts English | - | 1425 | 9,351 | |
| #116 | Multi Turn | - | 1398 | 6,092 | |
| #117 | English | - | 1410 | 15,162 | |
| #121 | Overall | - | 1394 | 34,466 | |
| #122 | Exclude Ties | - | 1371 | 24,391 | |
| #124 | Industry Business And Management And Financial Operations | - | 1389 | 6,535 | |
| #126 | Hard Prompts | - | 1412 | 20,403 | |
| #127 | Industry Life And Physical And Social Science | - | 1405 | 5,514 | |
| #128 | Russian | - | 1375 | 4,040 | |
| #131 | Industry Writing And Literature And Language | - | 1364 | 7,950 | |
| #132 | Industry Legal And Government | - | 1393 | 2,492 | |
| #133 | Industry Entertainment And Sports And Media | - | 1347 | 6,285 | |
| #134 | Creative Writing | - | 1346 | 5,211 | |
| #138 | Industry Medicine And Healthcare | - | 1396 | 2,380 |