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
#127
▼ 5 vs 7d ago
Total arena votes
271,349
Across 27 (subset, category) entries
Providers on OR
2
DeepInfra + others
First seen
2026-05-08
45 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 | 99.65% | - | fp8 | - |
| SiliconFlow | siliconflow/fp8 | 262K | $0.100 | $0.300 | 95.32% | - | fp8 | - |
Per-category ranks
Text
| Rank | Category | Variant | Trend | Elo | Votes |
|---|---|---|---|---|---|
| #94 | Spanish | - | 1405 | 1,409 | |
| #99 | Industry Mathematical | - | 1418 | 2,279 | |
| #101 | Expert | - | 1431 | 3,604 | |
| #105 | Math | - | 1408 | 2,641 | |
| #106 | Japanese | - | 1331 | 423 | |
| #112 | Chinese | - | 1434 | 2,104 | |
| #112 | Coding | - | 1449 | 11,088 | |
| #113 | French | - | 1416 | 1,359 | |
| #115 | Industry Software And It Services | - | 1437 | 16,795 | |
| #117 | Korean | - | 1335 | 769 | |
| #118 | Longer Query | - | 1409 | 15,752 | |
| #120 | German | - | 1378 | 786 | |
| #120 | Hard Prompts English | - | 1427 | 12,619 | |
| #121 | Instruction Following | - | 1388 | 13,840 | |
| #122 | English | - | 1412 | 19,890 | |
| #123 | Multi Turn | - | 1397 | 7,791 | |
| #127 | Exclude Ties | - | 1374 | 32,517 | |
| #127 | Overall | - | 1395 | 44,826 | |
| #128 | Industry Business And Management And Financial Operations | - | 1391 | 8,629 | |
| #129 | Hard Prompts | - | 1414 | 27,224 | |
| #130 | Industry Life And Physical And Social Science | - | 1407 | 7,190 | |
| #133 | Russian | - | 1377 | 5,169 | |
| #135 | Industry Entertainment And Sports And Media | - | 1350 | 8,574 | |
| #135 | Industry Writing And Literature And Language | - | 1366 | 10,637 | |
| #137 | Creative Writing | - | 1349 | 6,985 | |
| #139 | Industry Legal And Government | - | 1394 | 3,337 | |
| #139 | Industry Medicine And Healthcare | - | 1402 | 3,112 |