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StepFun

Step 2 (16K) API

StepFun
About

Build advanced reasoning agents with Step 2 (16K), a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $5.21/1M input and $16.44/1M output tokens, native tool calling support. Access Step 2 (16K) via the StepFun API with up to 8K output tokens.

Capabilities

Input Modalities

text

Output Modalities

text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
Attachment
Not Supported
Limits
Context Window
16K

Tokens

Input Limit
16K

Tokens

Max Output
8K

Tokens

Pricing

Standard (per 1M tokens)

Input
$5.21
Output
$16.44

Caching (per 1M tokens)

Read
$1.04
Frequently Asked Questions

Step 2 (16K) by StepFun costs $5.21 per 1M input tokens and $16.44 per 1M output tokens. Cached reads cost $1.04 per 1M tokens.

Model Details
ID
step-2-16k
Provider
StepFun
Family
Release Date
Jan 1, 2025
Knowledge Cutoff
Jun 1, 2024
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
STEPFUN_API_KEY
API Base URL
https://api.stepfun.com/v1
Documentation