Software development
Work in a real repository to understand the codebase, plan and implement changes, debug, test, and review them, and carry the work through to a deliverable result.
BitFun
An open, capable agent system built for real work.BitFun combines a high-performance agent runtime written in Rust with a polished desktop application. It pairs the depth of a Code Agent with open, general-purpose capabilities for work beyond software development.
Product overview
A cross-platform agent workspace with an expanding range of device experiences.
- DesktopAvailable
- WebRemote access
- PhoneBeta
- WatchIn development
- GlassesIn development
- MoreExploring
What can BitFun do?
Give BitFun a real codebase, source materials, or a clear objective. It carries the task from understanding and execution through verification to delivery.
Research & office work
Research source materials, synthesize findings, and produce presentations, documents, spreadsheets, PDFs, meeting notes, and reports.
Specialized workflows
Extend BitFun around your domain knowledge, data, and processes to support additional professional use cases.
What makes BitFun different?
BitFun is being developed around continuous execution, cross-device collaboration, open customization, efficiency, and interaction quality.
Lights-Out Factory
Continuous execution
Plan work during the day, let tasks run on a server overnight, and review the results in the morning.
Infinite Radius
Cross-device collaboration
Extend work from desktop and browser to mobile, wearables, and other devices so tasks remain accessible and continuous across devices.
App Evolution
Open customization
Extend BitFun with custom Agents, MCP integrations, Skills, Mini Apps, or source-level changes to create workflows for your own needs. Community contributors have already built versions for short-form drama, media production, and other specialized uses.
Core product experience
Better, Faster, Cheaper
Efficiency, quality & cost
Optimize for task efficiency, result quality, and cost together.
Interaction Aesthetics
Visually polished and easy to use
BitFun continually refines visual hierarchy, motion feedback, and interaction flows so its desktop GUI remains clear, responsive, and easy to use.
Build specialized agents with BitFun
BitFun provides a runtime, context management, tools, permissions, execution environments, product interfaces, and cross-platform infrastructure. Builders can add domain data, specialized tools, and workflows to create agent products for specific use cases.
Infrastructure
Rust runtime · Cross-platform support · Local and remote environments
General capabilities
Context · Tools · Permissions · Execution · Sessions
Capability assembly
Agents · MCP · Skills · Hooks · Mini Apps
Domain-specific product
Data · Decision logic · Workflows · Product experience
Community-built editions
Community contributors have built specialized versions of BitFun
UI design edition
Interfaces, interaction, and product experience
AI comic-drama edition
Generative content production
Video production edition
Audiovisual production workflows
More community versions
Additional versions continue to emerge
BitFun · Agent Runtime
A composable agent runtime for multiple product surfaces, with local execution, relay-mediated peer sessions, and SSH-based remote workspaces.
Product Entry Points
Desktop
Windows · macOS · Linux
Web
Browser-based remote access
Command line
CLI / TUI
Mobile
Mobile Web · Messaging
Wearables
Watch · Glasses · In development
Unified Capability Interface
A shared access layer that connects product surfaces to runtime capabilities.
Agent Harness
Code Agent
Turn requirements into reliable software
Design · build · debug · verify
Co-work
Create office deliverables from source material
Slides · documents · spreadsheets · PDFs
Deep Research Agent
Investigate complex questions
Search · verify · analyze · synthesize
Goal Mode
Continue toward a defined objective
Plan · execute · verify · adapt
More modes
Support additional specialized tasks
In development
Agent Runtime Kernel
Context Engine
- Session management
- Workspace state
- Memory management
- Persistent storage
Maintains the context needed to understand and continue work across sessions
Runtime Governance Engine
- Task orchestration
- Intelligent routing
- Concurrent scheduling
- Resource coordination
Coordinates task orchestration, scheduling, and resources during execution
Execution Engine
- Tool calls
- Permission checks
- Sandboxed execution
- Result reporting
Executes plans through governed tools and returns structured results
Tools & Execution
File systemTerminalBrowserComputer UseMCPMore
Runtime Infrastructure
Runtime core
High performance · Memory safety
Rust kernel
Model request engine
Model access · Protocol compatibility
Request orchestration · Multi-model support
Runtime services
Files · Events · Gateways
Shared capability services
Security & observability
Isolation · Permission controls
Logs · Metrics · Audit trailsBitFun performance measurements
Measured across capability, context reuse, and search speed—each result reflects a specific test, not a universal ranking.
Completion benchmarks, KV cache reuse, and large-codebase search measurements provide separate views of task results, token economy, and retrieval speed.
Software-engineering task completion
Higher is betterSWE-Bench-Pro
BitFun52%
OpenCode51%
Claude Code50%
SWE-Bench-Verified
BitFun74%
OpenCode72%
Claude Code69%
Token economy
Average KV cache hit rate98.67%
Measured in the same SWE-Bench-Pro round; a higher hit rate indicates greater context reuse but does not by itself quantify end-to-end cost.
Large-codebase retrieval
Maximum search-time reduction~94.6%
Measured with flashgrep on repositories at Chromium scale; the same evaluation reported an average speedup of about 36.1×.
The completion scores are initial, single-run results using DeepSeek-V4-Pro and may vary with task sampling, model versions, runtime environments, and single-run variance. They are an early capability signal, not a fixed ranking. The cache and search figures reflect the specific evaluations described above; fuller cost and latency reporting is still planned.
Learn more about BitFun
Explore the source, product website, and community discussions to follow progress or share feedback.