Multi-File Architectural Reasoning
Step-5 Preview plans and executes changes spanning multiple files and modules with zero hallucination. It understands your project structure, import chains, and type systems.
psychology
Frontier AI Coding Model · 100% Free
Step-5 Preview Completely Free
StepFun's next-generation frontier reasoning model is now live on Brevy Copilot at zero cost. Experience 256K long-context repository intelligence, superior algorithmic problem solving, and NVIDIA-accelerated real-time token streaming. No credit card. No trial. Just pure developer superpower.
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100% Free Forever
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256K Token Context Window
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NVIDIA NIM High-Throughput Inference
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Native Realtime VS Code Streaming
What is Step-5 Preview?
Step-5 Preview is the breakthrough frontier model created by StepFun AI, engineered from the ground up for high-complexity software engineering, multi-turn algorithmic deduction, and full-repository context tracking. With its expansive 256,000 token context window, Step-5 Preview can digest entire codebases, trace dependencies across dozens of files, and synthesize robust architecture proposals in a single prompt.
Through Brevy Copilot, developers gain direct, native access to Step-5 Preview directly inside VS Code. Every query is routed through dedicated NVIDIA high-performance infrastructure with built-in pacing queues and automated fallback resilience, giving you uninterrupted, enterprise-grade AI power without paying a cent.
Capabilities
Why Step-5 Preview Leads the Frontier
A powerhouse reasoning engine tailored for modern software developers.
256K Token Massive Context
Feed full documentation pages, large schemas, database migrations, and complex codebases at once. Step-5 maintains pin-point needle-in-a-haystack recall across the entire context.
Root-Cause Bug Diagnosis
Paste subtle race conditions, memory leaks, or cryptic compiler traces. Step-5 applies rigorous step-by-step verification to diagnose the exact issue and provide surgical patches.
NVIDIA NIM Accelerated Inference
Backed by NVIDIA's premier AI computing fabric with Brevy's real-time word-by-word streaming. Watch complex algorithms generate smoothly in VS Code with sub-second initial token arrival.
Clean Code Refactoring & Tests
Modernize legacy implementations into elegant, type-safe, idiomatic code while generating complete unit and integration test suites with edge case coverage.
Zero Cost · No Credit Card
No trials that secretly renew, no credit card forms, and no hidden surprises. Sign up in seconds with your email and code with Step-5 Preview immediately.
Polyglot
Deep Mastery Across Every Language & Framework
Step-5 Preview is benchmark-tested on 40+ programming languages.
Python
TypeScript
JavaScript
Rust
Go
C++
C# / .NET
Java
Kotlin
Swift
SQL / PostgreSQL
PHP
Ruby
Dart / Flutter
React / Next.js
Vue / Svelte
Docker / K8s
Bash / Shell
Solidity
GraphQL
Head to Head
Step-5 Preview vs Other Coding Assistants
How Step-5 Preview on Brevy Copilot outclasses commercial alternatives.
Feature
Step-5 Preview (Brevy)
GitHub Copilot
Cursor (Paid)
Free Forever Tier
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cancel $10–$19/mo
cancel $20/mo
Context Window
256K Tokens
8K–32K
64K–128K
Inference Acceleration
NVIDIA NIM Direct
Shared Cloud
Standard API
Multi-File Reasoning
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Limited
Standard
Credit Card Required
None Needed
Required
Required
Realtime Token Streaming
check_circle Native Low Latency
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Quick Start
Start Coding with Step-5 Preview in 3 Minutes
1
Install Brevy Copilot in VS Code
Open VS Code, press Ctrl+P (or Cmd+P), and type ext install Brevios.brevy-copilot. It installs instantly with zero dependencies.
2
Sign Up for Free
Click Sign In from the extension sidebar or web portal. You will be assigned a permanent Free Plan with zero billing required.
3
Select Step-5 Preview & Code
Pick Step-5 Preview from the model picker in your Brevy Copilot chat or command palette, and enjoy instantaneous, frontier-grade coding intelligence.
FAQ
Frequently Asked Questions
Is Step-5 Preview really free forever?
Yes. Brevy Copilot includes Step-5 Preview as one of our 10 permanently free models. There are no surprise trial conversions and no credit card required.
How does Step-5 Preview differ from DeepSeek V4.1 Flash?
DeepSeek V4.1 Flash is engineered for extreme throughput and quick turnaround code generation, while Step-5 Preview specializes in deep multi-step algorithmic reasoning, complex bug hunting, and huge 256K token context architectures. You can switch between both models freely inside Brevy Copilot.
Can I use Step-5 Preview for commercial projects?
Yes! Code generated by Step-5 Preview belongs entirely to you. You are free to use it in personal open-source projects, startups, or enterprise applications.
Does Brevy Copilot train on my code?
No. Your code is processed strictly for inference in memory and is never used to train foundational AI models. We respect your code privacy and intellectual property.
How do rate limits work on the Free Plan?
Free plan accounts receive a generous rolling quota that refreshes automatically throughout the day. NVIDIA pacing queues ensure fair allocation with minimal wait times even during peak hours.
Ready to Experience Step-5 Preview for Free?
Supercharge your VS Code workflow today with StepFun's flagship frontier model. Zero friction, zero credit card, 100% free.
Try Step-5 Preview Free
Instant setup · 100% Free · No credit card required