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Nvidia

Step 3.5 Flash API

Nvidia
About

Build advanced reasoning agents with Step 3.5 Flash, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers available completely free of charge, native tool calling support, open weights architecture. Access Step 3.5 Flash via the Nvidia API with up to 16K output tokens.

Capabilities

Input Modalities

text

Output Modalities

text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsOpen
Temperature
Adjustable
Attachment
Not Supported
Limits
Context Window
256K

Tokens

Input Limit
256K

Tokens

Max Output
16K

Tokens

Pricing

Standard (per 1M tokens)

Input
Free
Output
Free
Frequently Asked Questions

Step 3.5 Flash by Nvidia costs Free per 1M input tokens and Free per 1M output tokens.

Model Details
ID
stepfun-ai/step-3.5-flash
Provider
Nvidia
Family
Release Date
Feb 2, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
NVIDIA_API_KEY
API Base URL
https://integrate.api.nvidia.com/v1
Documentation