AI Recommendation
Should you use Step-3.5-Flash?
Step-3.5-Flash is listed for chat workloads and supports a 8K context window.
Use it when ModelScope's free tier is enough for evaluation, demos, or light production traffic.
Step-3.5-Flash Free API on ModelScope
Free API Verified Catalog profile Profile provider catalog metadata
StepFun Step 3.5 Flash is available free on NVIDIA NIM with up to 40 RPM and no daily token cap.
Free APIOpenAI compatible
API Details
Copy-ready connection details
Base URL
https://api-inference.modelscope.cn/v1 Model ID
stepfun-ai/Step-3.5-Flash API format OpenAI Chat Completions + OpenAI Responses
Technical Details
Step-3.5-Flash specifications
Context window 8K
Max output 4K
Status Online
Last updated Jul 7, 2026
Free listing since Jun 29, 2026
Input text
Output text
Best for
- Chat
Strengths & Weaknesses
Strengths
- Live API verification available
Watch outs
- Vision support is not listed
- Tool calling is not confirmed
Availability
Step-3.5-Flash availability by provider
We only found this Step-3.5-Flash listing on ModelScope in the current catalog. Use the related models section for nearby alternatives.
| Provider | Model listing | Access | Context | API | Limits |
|---|---|---|---|---|---|
| | stepfun-ai/Step-3.5-Flash | Free tier | 8K | Native | Varies |
Compare
Step-3.5-Flash alternatives to consider
| Model | Provider | Context | Access |
|---|---|---|---|
| Qwen/Qwen3.5-35B-A3B | ModelScope | 131K | Check provider |
| Qwen/Qwen3.5-27B | ModelScope | 131K | Check provider |
| MiniMax-M2.5-highspeed | ModelScope | 205K | Check provider |
| Kimi K2.5 | ModelScope | 262K | Check provider |
| Qwen/Qwen-Image | ModelScope | 131K | Check provider |
Typical Use Cases
Step-3.5-Flash use cases
Chat
Step-3.5-Flash is tagged for chat in this catalog and works with OpenAI-compatible client libraries.
FAQ
Step-3.5-Flash free API FAQ
Is Step-3.5-Flash free to use?
Step-3.5-Flash is listed with free API access on ModelScope, subject to the provider's quota and account policy.
What is the Step-3.5-Flash model ID?
The model ID shown in this catalog is stepfun-ai/Step-3.5-Flash.
What context window does Step-3.5-Flash support?
The listed context window is 8K tokens with up to 4K output tokens.
More about Step-3.5-Flash
StepFun Step 3.5 Flash is available free on NVIDIA NIM with up to 40 RPM and no daily token cap. StepFun's latest flash-optimized model prioritizes speed and efficiency for high-throughput tasks while retaining strong general performance. OpenAI-compatible API. Requires free NVIDIA Developer Program membership and phone verification.
For API keys, setup steps, and provider-level limits, see the ModelScope provider page.