Last updated 08-03-2026
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Sixth
Sixth is a developer-focused coding agent that plans, writes, and debugs software inside your editor and through chat. It ships as a web app and a Visual Studio Code extension, and it routes work across frontier models from Anthropic, Google, and OpenAI instead of locking you to one provider.
Where many assistants jump straight to autocomplete, Sixth emphasizes orchestration. Deep Planning Mode drafts a step-by-step strategy before code changes, sub-agents run research and validation in parallel, and Telegram remote control lets you approve tasks from a phone. Paid tiers add MCP server access, with Pro+ listing more than 1,000 integrations.
Individual developers can start on the free tier with monthly agent and completion limits. Pro, Pro+, Ultra, and Teams plans raise usage caps, model access, and support levels, while the Enterprise page adds SOC 2 Type II compliance, SSO, and optional private deployment for regulated teams.
Deep Planning Mode maps a step-by-step coding strategy before the agent edits files
Sub-agents run research, writing, and validation tasks in parallel during one session
Free tier includes 50 agent or chat requests and 2,000 completions per month
Pro+ unlocks 1,000+ MCP servers plus models such as GPT-5.6 sol and Gemini 3.6
Telegram remote control lets you monitor, approve, and steer agent work from a phone
Enterprise page lists SOC 2 Type II compliance, SSO, and a 99.99% uptime SLA
Free tier includes 50 agent requests and 2,000 completions per month without a credit card.
Deep Planning Mode and sub-agents focus on multi-step workflows instead of one-off completions.
Pro+ lists access to more than 1,000 MCP servers alongside multiple frontier models.
Telegram remote control supports monitoring and approving agent tasks away from the desk.
Enterprise page documents SOC 2 Type II compliance, SSO, and optional private deployment.
Free plan caps agent or chat requests at 50 per month.
Teams pricing supports only up to 4 members on the published plan card.
Ultra runs $160 per month before the 20% yearly discount.
The marketing site is a JavaScript app, so feature details load mainly in a browser.
Is Sixth free to use?
Yes. Sixth offers a free Individual plan with 50 agent or chat requests and 2,000 completions per month, access to Claude 4.5 and Gemini 3 pro, and community support. No credit card is required to get started on trysixth.com.
How much does Sixth Pro cost?
Sixth Pro is listed at $17 per month on the pricing page. It includes access to GPT-5.3 and Sonnet 4.6, a limited usage allocation, basic MCP server access, and priority email support. Yearly billing saves 20% compared with monthly checkout.
What AI models does Sixth support?
Sixth routes requests across multiple frontier models depending on plan. The free tier lists Claude 4.5 and Gemini 3 pro, Pro adds GPT-5.3 and Sonnet 4.6, and Pro+ expands access to GPT-5.6 sol, FABLE-5 mythos, and Gemini 3.6.
Does Sixth have a VS Code extension?
Yes. Sixth publishes a Visual Studio Code extension named Sixth.sixth-AI on the Visual Studio Marketplace. The extension connects the same agent workflows to your local editor alongside the trysixth.com web app.
What is Sixth Deep Planning Mode?
Sixth Deep Planning Mode builds a step-by-step strategy before the agent writes code. The homepage positions it as a way to reduce rushed edits by planning the full approach first, then executing against that plan inside Sixth.
Does Sixth support MCP servers?
Yes. Sixth Pro includes basic MCP server access, while Pro+ and Ultra list unlimited access to more than 1,000 MCP servers. Ultra also adds custom MCP server integrations for teams that need bespoke tool hooks.
Can I control Sixth agents from Telegram?
Yes. Sixth advertises Telegram remote control so you can start work on a PC and monitor, approve, or steer agent tasks from your phone. That flow is part of the agent orchestration features shown on the homepage.