Step 3.7 Flash is a fast, low-cost model optimized for high-throughput chat and bulk processing. Reach for it when you need to handle text, image, or video inputs at scale with tool calling and reasoning enabled.
Modalities
Text+Image → Text
Input
$0.27 /1M
Output
$1.553 /1M
Cached input
$0.027 /1M90% off
Context
256K
Speed
fast
Performance
Live production data from real requests on Kyma — not synthetic benchmarks.
Rank
#52
of 87 active models
Tokens served
20.3K
all-time
Success rate
100%
last 7 days
Pricing
Pay per token. Cached input is billed at 10% of the input rate.
+ Estimate your workload− Estimate your workload
Estimated monthly cost
$35.12
$1.17 / day on Step 3.7 Flash
Same workload on:
Estimates use list pricing with cached input billed at the 90%-discount rate. Actual bills depend on real token counts — every response includes its exact cost.
When to use Step 3.7 Flash
Where this model earns its cost — and where it doesn't.
Created by stepfun, it supports a 256,000-token context window and accepts text, image, and video inputs while returning text. It includes native support for tool calling, reasoning, and structured outputs.
On Kyma, requests are routed through an OpenAI-compatible endpoint with automatic failover if a serving path degrades. Prompt prefixes are cached at 10% of the standard input rate.
The model caps output at 8,192 tokens, making it suitable for conversational and extraction workflows rather than long-form generation.
Bulk Chat Processing
Route high-volume conversational workloads with low latency and minimal overhead.
Multimodal Input Analysis
Extract information from text, images, and video streams in a single request.
Tool-Driven Workflows
Execute function calls and structured data extraction for automated pipelines.
Long-Context Summarization
Process documents up to 256K tokens while maintaining fast response times.
Not ideal for: It is not suited for tasks requiring outputs longer than 8,192 tokens or heavy creative writing where maximum reasoning depth is prioritized over speed and cost.
How it compares
Against the peers people actually weigh it against.
| Spec | Step 3.7 Flash | Llama 4 Maverick | Grok 4.20 Multi-Agent |
|---|---|---|---|
| Input /1M | $0.27 | $0.27 | $1.688 |
| Output /1M | $1.553 | $1.08 | $3.375 |
| Context | 256K | 1M | 2M |
| Tools | Yes | Yes | No |
| Reasoning | Yes | No | Yes |
| Speed | fast | fast | slow |
Quick start
Up and running in under two minutes.
- 1
Create an API key
Sign up and grab a key from the dashboard — $0.50 free credit, no card required.
Get API key → - 2
Make your first request
Drop in your key and send a chat completion — fully OpenAI-compatible.
curl https://kymaapi.com/v1/chat/completions \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "step-3.7-flash", "messages": [ {"role": "user", "content": "Explain prompt caching in one paragraph."} ] }' - 3
Stream responses
Add
"stream": trueto receive tokens as they arrive.curl https://kymaapi.com/v1/chat/completions \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "step-3.7-flash", "stream": true, "messages": [{"role": "user", "content": "Hello!"}] }'
FAQ
Common questions about this model.