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December 23rd 2025 ☃️

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Live Previews (beta)

• Live preview available in beta to all users.
• Start new template project from cto.new.
• Add build and run commands to task runner.
• Setup agent attempts build and run commands.

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Smarter model selection

• Route tasks based on quality, speed, capacity, and cost.
• Expanded model support, including:
  • GPT-5.2
  • Sonnet 4.5 - GPT 5.2 alloy
  • Claude Opus 4.5
  • Gemini 3 Flash preview)
  • GLM-4.7
  • MiniMax M2.1
  • Devstral 2

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Engine-agent chat improvements

• Faster, more reliable task planning.
• Better visibility into tool usage during runs.
• Tasks started from chat are now properly scoped and isolated.
• Simplified planning and draft task UX.

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MCP overhaul

• Unified MCP system with clearer setup and fewer edge cases.
• Global MCPs can now be configured once and reused in agents and chats.
• Per-chat MCP selection for more control.
• Improved support for HTTP, SSE, and stdio MCPs.
• Better error handling and clearer tool naming.

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Reliability & performance

• Faster VM startup times.
• More robust VM lifecycle handling.
• Better handling of temporary provider outages.

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Benchmark

• Introduced cto bench, measuring real-world task success rates across models.
• Live chart and leaderboard updated every day.

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UI & UX polish

• Mobile improvements.
• Keyboard shortcut: ⌘ + Enter throughout the app.
• Create empty repo from cto.new.
• Clearer task and preview states.
• General responsiveness and stability improvements.

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November 26th 2025

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Product & UX

• Add “get code” buttons for easily copyable git checkout commands for a task.
• Add task preview in alpha.
• Clearer draft PR/MR status.
• Chats moved to their own page.
• Add privacy mode for zero data use.

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Models & Routing

• Added GPT-5.1 and GPT-5.1 Codex and removed GPT-5 and GPT-5 Codex.
• Added GPT-5.1 Codex Mini.
• Added Gemini 3 Pro Preview.
• Added Kimi K2 Thinking.
• Added MiniMax M2.
• Improved and updated auto model routing.

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Infra, Events & Git

• Harden events queueing and retries.
• Update GitHub webhooks and improve git reliability.
• Status page: status.cto.new.

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November 15th 2025

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Models

• Added auto-model selection.
• Haiku set as chat default for improved speed and tool calling.
• Tasks started from drafts use preferred model.

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Chat

• Optimistic send for chat messages.
• Cancel chat messages.
• 20k character message limit.

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UI/UX

• Git checkout command in task view.
• Fix chat text area resizing, mobile fixes, dark-mode tweaks.
• Surfaced secrets error messages.

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Auth and Invites

• Update invite eligibility to prevent abuse.
• Google sign-in restored.

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Reliability and Bugfixes

• Fix diff saving.
• Race fix on user/org creation.
• Validate env/secret format.
• Fix “ghost queued” tasks.

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October 31st 2025 🎃

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Chat & UX

• Fixed chat text area resize.
• Optimistic send - show user messages instantly.
• Chat summaries: agent can now reference last 10 chats.

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Models & Memory

• Added memory to chat agent.
• Improved chat label generation.
• Added Haiku, improved Anthropic prompt caching.

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October 29th 2025

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Tasks & Workflow

• Shorter draft titles.
• Chat agent now aware of tasks.

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Models & Execution

• Anthropic fully restored (incl. Alloy).
• Add GLM-4.6.
• Improve prompt caching.

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Abuse & Rate Limits

• 20k-char cap on first chat message.
• Domain blocks for obvious botting.
• Added CAPTCHA and bot blocks.

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Git & Repos

• Hardened git token fetching/retries.

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Reliability & Ops

• Removed legacy ticket plans/speculative mode; removed context7 MCP and Anthropic web_search tool.
• Start routing tasks to Northflank for scalability.

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UI

• Dark mode.
• Text area resize fixes.

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October 22nd 2025

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Access & onboarding

• Invite UX: add invite button; generate all available codes.
• Team invites: invited team members no longer need codes.
• Sign-up protections to block bots.

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Draft tasks & task UX

• Prevent multiple tasks per draft.
• Save draft edits on start; show actionable controls only when valid.

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Models & routing

• Add AWS Bedrock for Anthropic model failover.
• Better labels & long-chat handling; include model name in system prompt.

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GitHub & repos

• Fix Start GitHub issue from @cto tag.
• Branch selector no longer crashes if branch deleted.

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Reliability & safety

• Fewer flaky runs: increase events timeout; harden Git token fetching/retries; empty-repo/default-branch fixes.
• Auto-ban abusive agent chat calls (unknown adapter/invalid schema).