december, a coding agent
for terminal and cloud.
Lives in your shell to write code, fix bugs, and execute commands with zero latency—with instant cloud sandboxes whenever you need them.
December is an coding agent that lives in your terminal. It understands your codebase and helps you build faster by writing code, fixing bugs, and running commands. Use it directly in your terminal or alongside your favorite IDE.
What we do
Writes code & runs commands:
Ask it to build features, fix bugs, or run tests. It does the work for you.
Cloud Handoff:
Use /handoff to continue your session on trydecember.com
Bring your own AI:
Use API keys for OpenAI, Anthropic, Gemini, and 20+ others, or log in via December to use December credits.
In Production
Our promise is the fastest execution for agents: the kind people feel, not just the kind that tops a benchmark.
Recall latency
PER QUERY, ON PRODUCTION TRAFFIC
Tokens processed
PER MONTH
Organizations
TENS OF MILLIONS OF END USERS
Independent benchmarks
SWE-CONTEXTBENCH, FEBRUARY 2026
“December performs best overall, achieving FAIL_TO_PASS test rate of 55.95% and highest resolution rate of 30.30%.”
Public benchmarks
STATE OF THE ART ON SWE-BENCH, HUMAN-EVAL AND TERMINAL-BENCH
Our benchmarks
“Reduced avg response time from 40s → 12s. Using about 40–50% fewer tokens.”
Deployment
december runs everywhere, even in air-gapped environments.
We build all the critical infrastructure ourselves. Which means we can deploy it wherever your data lives.
In your data center
001
In your VPC
002
On your laptop
003
The Architecture
Local filesystem speed when you write code. Cloud isolation when you need preview servers.
December bridges the gap between terminal-native execution and collaborative cloud infrastructure. It operates with zero latency inside your existing shell, inspecting git trees and running native test runners directly. When a task requires full-stack web previews or sharing with a team, typing /handoff seamlessly shifts execution to cloud micro-VMs.
Features
Engineered for Developer Velocity
Bring Your Own Key (BYOK)
Use Claude 3.7, GPT-4o, Gemini 2.5, DeepSeek, or private offline Ollama models. Free forever with 0% token markup.
Git Checkpoints & Diffs
Every file edit is versioned. Inspect line-by-line diffs before committing or rollback instantaneously to any prior point in time.
Parallel Subagents
Dispatch autonomous background agents to survey large repos, read API documentation, and execute parallel code tasks.
Custom Skills & AGENTS.md
Teach December your team's code conventions, architecture principles, and custom slash commands via repository rules.
Live Web Sandboxes
Spin up full-stack dev servers (Next.js, Vite, Node) with public preview URLs to share with colleagues without local tunnels.
Zero-Config Browser App
Prefer the browser? Launch app.trydecember.com for a complete cloud IDE with live previews and full shell access.
Installation
Install via Terminal
Pricing
Developer-Friendly & Transparent
Free forever with your own API keys. Or upgrade to December Cloud for zero-setup VMs.
Bring your own API keys. 0% token markup.
- ✓ Full CLI access in your local terminal
- ✓ Use Claude 3.7, GPT-4o, Gemini 2.5, DeepSeek
- ✓ Offline local Ollama models support
- ✓ Git checkpoints & diff rollback safety
- ✓ Unlimited local code generation runs
Everything in BYOK, plus managed cloud VMs and shared wallet.
- ✓ Everything in BYOK tier
- ✓ $22.00 monthly LLM wallet credits
- ✓ One-click /handoff to cloud workspace
- ✓ Hardware-isolated micro-VM sandboxes
- ✓ Live web previews with TLS tunnels