Step 3.5 Flash (Deep Infra) API
About
Build advanced reasoning agents with Step 3.5 Flash (Deep Infra), a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.09/1M input and $0.30/1M output tokens, native tool calling support, open weights architecture. Access Step 3.5 Flash (Deep Infra) via the Eden AI API with up to 256K output tokens.
Capabilities
Input Modalities
text
Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsOpen
Limits
Context Window
262K
Tokens
Input Limit
262K
Tokens
Max Output
256K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.09
Output
$0.30
Caching (per 1M tokens)
Read
$0.02
Frequently Asked Questions
Step 3.5 Flash (Deep Infra) by Eden AI costs $0.09 per 1M input tokens and $0.30 per 1M output tokens. Cached reads cost $0.02 per 1M tokens.
Model Details
ID
deepinfra/stepfun-ai/Step-3.5-Flash
Provider
Eden AIFamily
Release Date
Jan 29, 2026
Knowledge Cutoff
Jan 1, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
EDENAI_API_KEY
API Base URL
https://api.edenai.run/v3