Step 3.7 Flash
Step 3.7 Flash is a language model from StepFun. It is currently free at 1 provider with up to 262K tokens of context. The model supports step-by-step reasoning. Its weights are open, so it can also run locally.
- Developer
- StepFun
- Context
- 262K tokens
- Type
- Text
- License
- Open weights
Where to use Step 3.7 Flash for free
Each row is a separate free endpoint with its own limits.
| Provider | Context | Limit | Card | |
|---|---|---|---|---|
Nous Portal stepfun/step-3.7-flash:free |
262K | The $0 Portal plan includes free models with standard rate limits. Model availability can change. | No | Open |
Quick start
curl https://inference-api.nousresearch.com/v1/chat/completions \
-H "Authorization: Bearer $NOUS_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "stepfun/step-3.7-flash:free",
"messages": [{"role": "user", "content": "Hello!"}]
}'from openai import OpenAI
client = OpenAI(
base_url="https://inference-api.nousresearch.com/v1",
api_key="YOUR_NOUS_API_KEY",
)
reply = client.chat.completions.create(
model="stepfun/step-3.7-flash:free",
messages=[{"role": "user", "content": "Hello!"}],
)
print(reply.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://inference-api.nousresearch.com/v1",
apiKey: process.env.NOUS_API_KEY,
});
const reply = await client.chat.completions.create({
model: "stepfun/step-3.7-flash:free",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(reply.choices[0].message.content);Example for Nous Portal. Any OpenAI-compatible client works: Cursor, Cline, OpenCode, Open WebUI.
Benchmarks
Source: Artificial Analysis · Step 3.7 Flash
Similar free models
FAQ
Is Step 3.7 Flash free?
Yes. As of September 26, 2026, Step 3.7 Flash is free at Nous Portal. Each provider has its own limits — see the table above.
What is the context window of Step 3.7 Flash?
The largest context among free routes is 262,144 tokens. Some providers cap it lower.
How do I call Step 3.7 Flash via API?
Use any OpenAI-compatible client with base URL https://inference-api.nousresearch.com/v1, model ID stepfun/step-3.7-flash:free, and a Nous Portal key.
How good is Step 3.7 Flash?
Artificial Analysis Intelligence Index: 19.5, GPQA Diamond: 81%. For comparison, the strongest free model in the catalog right now is GLM 5.3.
Is Step 3.7 Flash open-weight?
Yes, the weights are published — you can download and run it locally, for example with Ollama or LM Studio.