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ZenMux

Step 3.5 Flash API

ZenMux
About

Process massive datasets with Step 3.5 Flash, featuring an expansive 256K context window for long-document analysis. This model delivers cost-effective pricing at $0.10/1M input and $0.30/1M output tokens, native tool calling support. Access Step 3.5 Flash via the ZenMux API with up to 64K output tokens.

Capabilities

Input Modalities

text

Output Modalities

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

Tokens

Input Limit
256K

Tokens

Max Output
64K

Tokens

Pricing

Standard (per 1M tokens)

Input
$0.10
Output
$0.30
Frequently Asked Questions

Step 3.5 Flash by ZenMux costs $0.10 per 1M input tokens and $0.30 per 1M output tokens.

Model Details
ID
stepfun/step-3.5-flash
Provider
ZenMux
Family
Release Date
Feb 2, 2026
Knowledge Cutoff
Jan 1, 2025
API Integration
NPM Package
@ai-sdk/anthropic
Environment Variables
ZENMUX_API_KEY
API Base URL
https://zenmux.ai/api/anthropic/v1
Documentation