Replit has reached a milestone in AI-driven software development with Agent 3. The new agent is 10x more autonomous than its predecessor and redefines what "Vibe Coding" means.
What is Replit Agent 3?
Agent 3 is Replit's most advanced AI development agent. It works like an experienced developer – independently, efficiently, and with the ability to review its own work.
Core Capabilities
- 200 minutes of autonomous work – In Max Autonomy Mode, Agent 3 works continuously for up to 200 minutes
- Self-Testing – Automatically tests apps in the browser, clicks buttons, fills out forms
- Agent Generation – Can create specialized agents for automation tasks
- 3x faster, 10x cheaper than computer-use models
Self-Testing: The Game Changer
The most revolutionary feature is automatic testing. Agent 3:
- 1Opens the app in a real browser
- 2Tests all functions by clicking and interacting
- 3Detects issues and "Potemkin interfaces" (nice UIs without functionality)
- 4Corrects errors in a continuous improvement loop
You can watch the agent work live and view test reports.
Agent-Building Agent
Agent 3 can create other agents – a paradigm shift:
- Slack bots for GitHub or Notion queries
- Telegram schedulers for automatic bookings
- Meeting assistants for automatic preparation and follow-up
- Task aggregators for Linear, Jira, or Asana
Simply describe in natural language what the agent should do.
Design Mode & Fast Build
New development modes accelerate work:
- Design Mode – Creates interactive designs in under 2 minutes
- Fast Build Mode – Produces high-fidelity apps almost as quickly
- Figma Import – Converts Figma designs directly into working code
Benefits for Swiss Companies
Faster Time-to-Market
- Prototypes in minutes instead of weeks
- Automated tests reduce QA effort
- Continuous improvement without manual intervention
Lower Barriers to Entry
- Non-technical employees can create production-ready apps
- Natural language descriptions instead of programming code
- Built-in best practices and security standards
Enterprise-Ready
- SSO and SCIM provisioning
- Security scans for vulnerabilities
- Available on Google Cloud Marketplace
Conclusion
Replit Agent 3 marks the beginning of a new era in software development. With autonomous operation, self-testing, and the ability to create its own agents, Vibe Coding becomes a practical reality for companies of all sizes.