Step 3.7 Flash
stepfun/step-3.7-flash- StepFun
- Family · Step 3 Flash
- Released 29 May 2026
- Open weights
- Text · Image · Video → Text
- Reasoning · adjustable
- Tools · JSON · Vision
Not on OSMEXO yet
Spec & list price
Context256K
Max output225K
Input / 1M$0.20
Output / 1M$1.155.7× input
Scores · standing
Intelligence19.5#145/489
Coding39.6#90/196
Usage
Tokens / day79.6B▲ 234% 7d
Usage rank#38
Requests / day890.5K
Tool calls / req0.57
Per request · 30 days
Avg input58.0K3.9× median
Avg output1.5K2.1× median
Cache hit92%1.3× median
Tool-call failures2.4%1.2× median
Consumption
Peak 75.2B 28 OctLow 1.2B 11 OctRank today #38
Benchmarks
bar = share of the top score · Benchmark data: Artificial AnalysisSpeed · median across 2 providers, latest day
Output speed#277/33438 tok/s1.7× slower than median
First token#3154.81 s4.7× longer than median
#7 cheapest of 24 with a similar score
Value
Intelligence Index
Blended price per 1M tokens (log)
Family progress
Intelligence Index
- Family releases19.5
Technical details
- Reasoning
- on · medium
- Tokenizer
- Other
- License
- Apache 2.0
- Parameters
- 201B
- Moderation
- none
- Downloads · likes
- 12.0K · 462
Reasoning effort
- high
- medium · default
- low
Request parameters 18
- tools
- tool_choice
- response_format
- structured_outputs
- reasoning
- reasoning_effort
- include_reasoning
- temperature
- top_p
- top_k
+8 more
- max_tokens
- stop
- seed
- frequency_penalty
- logprobs
- presence_penalty
- repetition_penalty
- top_logprobs
Interesting facts
- 2.2× the output room of similar models (230.4K against a 106.5K median).
- Released 157 days ago, the newest of 2 Step 3 Flash models.
- Weekdays average 23.6B tokens a day against 25.1B on weekends.
When to use
Best for
- Tool-calling agents on a budget
- Image and video understanding
- Long-context question answering
- Reasoning with adjustable effort at lower cost
Think twice for
- Terminal-heavy coding agents
- Hardest coding benchmarks
- Image or audio generation
Same family
Step 3 Flash- S17.0
Alternatives
other vendors · similar capability- 21.8
- 18.2
- 21.5
- 22.2
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