Kiro changelog

Models: Kimi K3 now available in Kiro

Kimi K3 is now available with experimental support across the Kiro IDE, CLI, Crew, and Web for Pro, Pro+, Pro Max, and Power customers using Kiro's US geography. Moonshot AI's open-weight model accepts text and images and has a 1M-token context window, making…

IDE: Markdown Review, What's New Announcements, and Workflow Step Notifications

This release brings Markdown Review to every Kiro IDE user, so you can comment on Markdown files in your workspace and send the comments to Kiro in one batch. It also adds a What's new announcement browser, makes workflow step notifications easier to scan, can…

Models: Claude Sonnet 4 reaches end of life

Claude Sonnet 4 has reached end of life in Kiro as of October 14, 2026. If your work depends on it, choose another available model before continuing. Claude Sonnet 5.5 is the latest Sonnet model. See Model lifecycle for lifecycle stages and end-of-life dates.

CLI: Mermaid Diagram in Chat

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CLI: Local Command Sandbox and Local Autonomous Mode: Use the local command sandbox and autonomous mode in V3, load MCP tools on demand, and keep V3 configuration under KIRO_HOME.

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IDE: Local Command Sandbox, Start Saved Workflows from Chat, and Live Tab Status: Limit what agent-run shell commands can reach, start saved Workflows from chat, and see live session status on editor tabs.

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Web: Model Fallback, Workflow Step Models, and Session Reopen Previews

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CLI: Switch to V3 at Chat Start and Model Fallback Notices

This release shows a startup prompt inviting you to switch to V3 as part of a gradual rollout. It also adds V3 model fallback notices, keeps more of your V2 agent access when you upgrade agents to V3, and fixes screen reader, tmux, and knowledge search issues.

General: Kiro is now in scope for FedRAMP Class C

Kiro is now in scope for FedRAMP Class C in the US East (N. Virginia) Region. US government agencies, contractors, and other organizations whose workloads are subject to FedRAMP Class C requirements can now use Kiro for AI-assisted software development.

Models: Claude Opus 5.5 now available in AWS GovCloud (US): Claude Opus 5.5 is available in the Kiro IDE and CLI across both AWS GovCloud (US) Regions.

Models: Claude Sonnet 5.5 now available in AWS GovCloud (US): Claude Sonnet 5.5 is available in the Kiro IDE and CLI across both AWS GovCloud (US) Regions.

CLI: Memory Across Chat Sessions: In local V3 sessions, Kiro can learn useful context from your work and recall it in later chat sessions, with controls for memory access and automatic updates.

Kiro CLI 2.29.0 introduces Memory for local V3 sessions, so Kiro can carry useful context from your work, such as a repository's commands and conventions, into later chat sessions instead of asking you to restate it.

IDE: Workflow Feedback, Power Search, and Flexible Hook Matching

This release adds a feedback link for Workflows, fixes several chat, terminal, and source control issues, and improves workflow reliability, spec-only commands, and Hook matching.

IDE 1.2.56: Workflows, Safer Untrusted Workspaces, and Enterprise Sign-In Controls

Workflow Feedback, Power Search, and Flexible Hook Matching. Learn more ->

CLI: Switch to 3.0 from Classic, Category-Based Hook Matching, and Steadier V3 Sessions: Switch an interactive Classic session to 3.0, match V3 Hooks by tool category, and improve reliability in long V3 sessions.

Kiro CLI 2.28.0 offers Classic users a path to switch to 3.0 without leaving their terminal, lets V3 Hooks match tool categories, and makes long V3 chats more reliable.

IDE 1.2.37: Workflows, Safer Untrusted Workspaces, and Enterprise Sign-In Controls

IDE 1.2.37 tightens local-state access on macOS and Linux, preserves completed work during interruptions, and combines model search with effort controls.

Models: Claude Sonnet 5.5 Now Available

Claude Sonnet 5.5 is now available with experimental support across the Kiro IDE, CLI, Crew, and Web for Pro, Pro+, Pro Max, and Power customers in us-east-1 (IAD) and eu-central-1 (FRA). It's Anthropic's fastest Sonnet model to date and a clear upgrade over…

CLI: Workflow Delegation, Live Steering Context, and Saved Prompt Commands: Choose how V3 delegates with Workflows, include live file and folder context in Steering, and invoke saved prompts as slash commands.

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Web: Introducing Workflows in Kiro Web: Run reusable, multi-step agent plans in Kiro Web cloud sessions, inspect and guide every step, and keep working in the parent conversation.

Workflows are now available as an opt-in feature in Kiro Web cloud sessions. They run reusable, multi-step agent plans in the background while you continue working in the parent conversation.

CLI: Workflows, Classic Migration Guidance, and V3 Approval Safeguards: Run reusable, multi-step Workflows in V3, get clear guidance when Classic sessions start, and use stricter approval checks for files, tools, and shells.

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IDE: Workflows, Safer Untrusted Workspaces, and Enterprise Sign-In Controls: Run reusable multi-agent Workflows in the background, apply stronger safeguards to Kiro configuration, and manage enterprise sign-in options.

IDE 1.2 introduces Workflows, strengthens safeguards for untrusted workspaces, and adds enterprise controls for sign-in methods. This release also reworks session details, keeps enterprise traffic in your profile's Region, and fixes authentication, debugging,…

Models: Claude Opus 5.5 Now Available: Claude Opus 5.5 brings stronger agentic coding and clearer communication than Opus 5 at a 2.0x credit multiplier, down from Opus 5's 2.2x.

Claude Opus 5.5 is now available with experimental support across the Kiro IDE, CLI, Crew, and Web for Pro, Pro+, Pro Max, and Power customers in us-east-1 (IAD) and eu-central-1 (FRA). Anthropic reports stronger performance on long, complex coding tasks and…

CLI: Power Management, V3 Output Styles, and Fullscreen Scroll Speed: Install and uninstall Powers from chat or the command line, choose V3 output styles, tune fullscreen scrolling, and automate session teardown with a new Hook.

This release lets you manage Powers from a local V3 session or without starting chat, customize how V3 responds, and tune fullscreen scrolling. V3 also adds a SessionEnd Hook, while model notices, session loading, terminal rendering, authentication, and…

Crew: Crewmate Teams, Agent Templates, and Quieter Watches

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IDE: Configurable Terminal Timeouts, Clickable File Links, and Agent Focus Session Restore

IDE 1.1.70 lets you set a default timeout for local agent commands, opens Markdown links to workspace files in the editor, and keeps Agent Focus file and folder context aligned with the active project. Restored Agent Focus sessions now reconnect without…