StepFun
Step 3.7 Flash
Step 3.7 Flash is a StepFun model with 256K context, $0.20 in / $1.15 out per million tokens, last verified September 2, 2026. Open weights: yes. Public-board scores are linked to the publisher; vendor-only figures stay in the watch-out, not on the board.
Step 3.7 Flash is StepFun's efficient closed-API model for high-volume multimodal work.
Catalog record checked September 2, 2026Individual provider fields may change
| Specification | Step 3.7 Flash |
|---|---|
| Provider | StepFun |
| Tier | Budget |
| Context window | 256K |
| Max output | Not verifiedUnverified |
| Input / 1M tokens | $0.20 |
| Output / 1M tokens | $1.15 |
| Weights | Open |
| Parameters | 198B total / 11B active (sparse MoE VLM) |
| Reasoning levels | low, medium, high |
| Modalities | text, image |
| License | Apache 2.0 |
| API model id | step-3.7-flash |
| Released | May 29, 2026 |
Pricing tiers: $0.20/$1.15 per MTok hosted; open weights (Apache 2.0) on Hugging Face.
Verified evidence
Published benchmark results
Each result keeps its source and measurement date visible. A missing benchmark is not treated as a zero.
| Benchmark | Score | Measured | Source |
|---|---|---|---|
| Artificial Analysis Intelligence Index | 42 | 2026-08-14 | Artificial Analysis · View source |
Best for
- High-volume multimodal
- Cost-sensitive API
- Chinese market
Watch out
Source receipts
Catalog figures for this model were checked against the following sources.
- StepFun — Step 3.7 (accessed 2026-08-29)
- BenchLM — StepFun (accessed 2026-08-29)
Common questions
Step 3.7 Flash
Answered from the verified figures on this page rather than general guidance.
How much does Step 3.7 Flash cost per million tokens?
Step 3.7 Flash is listed at $0.20 per million input tokens and $1.15 per million output tokens at standard rates. Output tokens usually dominate real bills, so weigh the output rate more heavily than the input rate. $0.20/$1.15 per MTok hosted; open weights (Apache 2.0) on Hugging Face.
What is Step 3.7 Flash's context window?
Step 3.7 Flash accepts about 256K tokens of context. That only matters if you routinely send very long documents, large codebases, or multi-turn histories that approach that limit.
What is Step 3.7 Flash best for?
Step 3.7 Flash is a budget tier from StepFun. It suits high-volume multimodal, cost-sensitive api, chinese market. Closed API; verify pricing/availability.
Can I self-host Step 3.7 Flash?
Step 3.7 Flash publishes open weights, but self-hosting depends on the licence, hardware footprint, quantisation quality, and serving stack. A hosted API is often cheaper until you have measured throughput and concurrency on your own hardware.