StepFun · Released May 29, 2026Step 3.7 Flash
Newer StepFun flash model for faster agents, coding, and multimodal prompts.
- Capability
- —No ECI score yet
- Input
- $0.185per 1M tokens
- Output
- $1.11per 1M tokens
- Context
- 256K256K max output
What it costs
- Input
- $0.185per million tokens
- Output
- $1.11per million tokens
- Cached input
- $0.037per million tokens
- Blended (3:1)
- $0.416cheaper than 65% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $0.925 |
| Team assistant25M input + 5M output tokens | $10.18 |
| Production app250M input + 50M output tokens | $101.75 |
Official StepFun (Global) API price, as listed on models.dev.
Independent benchmarks
Epoch AI has not published a Capabilities Index score for Step 3.7 Flash yet.
The details
- Lab
- StepFun
- Released
- May 29, 2026
- Knowledge cutoff
- Mar 1, 2026
- Context window
- 256,000 tokens
- Max output
- 256,000 tokens
- Inputs
- Text, Images, Video
- Output
- Text
- Reasoning
- Adjustable effort low · medium · high
- Tool calling
- Yes
- Structured output
- No
- Weights
- Open weights
- API model ID
step-3.7-flashon StepFun (Global)- Availability
- 18 API providerslisted on models.dev
What StepFun claims
Published by the lab at launch. Settings vary, so compare these only with care.
| Benchmark | Score | Setting | Source |
|---|---|---|---|
| SWE-Bench Pro | 56.3 resolve rate | — | Source |
| SWE-Bench Verified | 76.5 resolved | — | Source |
| Terminal-Bench v2.1 | 59.6 success rate | — | Source |
| Humanity's Last Exam | 47.2 | with tools | Source |
| BrowseComp | 75.8 | — | Source |
| Toolathlon | 49.5 success rate | — | Source |
| GDPval | 45.8 wins or ties | — | Source |
| ClawEval v1.1 | 67.1 | — | Source |
| Artificial Analysis Coding Index | 37.1 index | — | Source |
| SciCode | 40 percent correct | — | Source |
| Terminal-Bench Hard | 35.6 success rate | — | Source |
More from StepFun
About Step 3.7 Flash
How much does Step 3.7 Flash cost?
Step 3.7 Flash costs $0.185 input / $1.11 output per million tokens (official StepFun (Global) API price). Cached input is $0.037 per million tokens. At a 3:1 input-to-output mix that is $0.416 per million tokens, cheaper than 65% of the 360 priced models we track.
What is the context window of Step 3.7 Flash?
Step 3.7 Flash accepts up to 256,000 tokens per request and can write up to 256,000 tokens in one response.
How good is Step 3.7 Flash?
Epoch AI has not published a Capabilities Index score for Step 3.7 Flash yet.
Is Step 3.7 Flash open source?
Yes. StepFun publishes the weights, so it can be downloaded and self-hosted.
What inputs does Step 3.7 Flash support?
Step 3.7 Flash accepts text, images and video and replies in text. It is a reasoning model with low, medium and high effort settings, supports tool calling.
When was Step 3.7 Flash released?
StepFun released Step 3.7 Flash on May 29, 2026. Its training data runs to Mar 1, 2026.
What are the best alternatives to Step 3.7 Flash?
The closest current models from other labs on capability, price and release date are Nemotron 3 Nano Omni 30B A3B Reasoning (NVIDIA, $0.25 / $0.85), Trinity Large Thinking (Arcee AI, $0.25 / $0.80), Toast 1 (Mixedbread, $0.30 / $0.72) and Mercury Edit 2 (Inception, $0.25 / $0.75).