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NanoGPT

Step 3.5 Flash Thinking API

NanoGPT
About

Build advanced reasoning agents with Step 3.5 Flash Thinking, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.20/1M input and $0.50/1M output tokens. Access Step 3.5 Flash Thinking via the NanoGPT API with up to 256K output tokens.

Capabilities

Input Modalities

text

Output Modalities

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

Tokens

Input Limit
256K

Tokens

Max Output
256K

Tokens

Pricing

Standard (per 1M tokens)

Input
$0.20
Output
$0.50
Frequently Asked Questions

Step 3.5 Flash Thinking by NanoGPT costs $0.20 per 1M input tokens and $0.50 per 1M output tokens.

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