AI Recommendation
Should you use Step 3.5 Flash 2603?
Step 3.5 Flash 2603 is listed for chat workloads and supports a 256K context window.
Use it when OpenRouter's free tier is enough for evaluation, demos, or light production traffic.
Step 3.5 Flash 2603 Free API on OpenRouter
Free API Verified Catalog metadata matched Reasoning models.dev metadata
StepFun flash lane for quick multimodal reasoning and coding assistance
Free APIOpenRouter nativeReasoningTool callingReasoning
Context window 256K
Max output 256K
API format OpenRouter native
Status Online
Best for
- Chat
Strengths & Weaknesses
Strengths
- Long context window
- Reasoning mode listed
- Tool calling support
- Open weights available
Watch outs
- Free-tier rate limits apply
- Vision support is not listed
Pricing
Step 3.5 Flash 2603 pricing per 1M tokens
Input $0.1 per 1M tokens
Output $0.3 per 1M tokens
Free access Available OpenRouter
Rate limit 200 req/day (free tier) provider policy
Availability
Step 3.5 Flash 2603 availability by provider
We only found this Step 3.5 Flash 2603 listing on OpenRouter in the current catalog. Use the related models section for nearby alternatives.
| Provider | Model listing | Access | Context | API | Limits |
|---|---|---|---|---|---|
| | Step 3.5 Flash 2603 | Free tier | 256K | Native | 200 req/day (free tier) |
Compare
Step 3.5 Flash 2603 alternatives to consider
| Model | Provider | Context | Access |
|---|---|---|---|
| Poolside: Laguna XS 2.1 (free) | OpenRouter | 262K | Free tier |
| Cohere: North Mini Code (free) | OpenRouter | 256K | Free tier |
| NVIDIA: Nemotron 3.5 Content Safety (free) | OpenRouter | 128K | Free tier |
| NVIDIA: Nemotron 3 Ultra (free) | OpenRouter | 1.0M | Free tier |
| NVIDIA: Nemotron 3 Nano Omni (free) | OpenRouter | 256K | Free tier |
Typical Use Cases
Step 3.5 Flash 2603 use cases
Chat
Step 3.5 Flash 2603 is tagged for chat in this catalog.
FAQ
Step 3.5 Flash 2603 free API FAQ
Is Step 3.5 Flash 2603 free to use?
Step 3.5 Flash 2603 is listed with free API access on OpenRouter, subject to the provider's quota and account policy.
What is the Step 3.5 Flash 2603 model ID?
The model ID shown in this catalog is stepfun/step-3.5-flash.
What are the Step 3.5 Flash 2603 free tier rate limits on OpenRouter?
The listed free tier limit is 200 req/day (free tier). Limits can change per account tier, so confirm against the provider dashboard.
What context window does Step 3.5 Flash 2603 support?
The listed context window is 256K tokens with up to 256K output tokens.
More about Step 3.5 Flash 2603
Free Step 3.5 Flash 2603 API.
For API keys, setup steps, and provider-level limits, see the OpenRouter provider page.