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Kiro Changelog · 2026-07-24

Models: Claude Opus 5 Now Available

Claude Opus 5 is now available in the Kiro IDE, CLI, and Web. It's a meaningful step up from Opus 4.8 on the hardest agentic coding tasks — setting new state-of-the-art results on leading coding benchmarks, more than doubling Opus 4.8's performance while approaching Fable 5 at half the cost. Excels at multi-file features, large refactors, and end-to-end feature work, completing full tasks rather than leaving stubs or placeholders. Opus 5 verifies its own work and iterates carefully until it succeeds. Multi-agent coordination sees meaningful gains with fewer conflicts between parallel agents. For code review, it finds a high rate of real bugs with low false positives and stays accurate at lower effort settings. Claude Opus 5 is rolling out gradually with experimental support to Kiro Pro, Pro+, Pro Max, and Power customers in us-east-1 and eu-central-1 with cross-region inference. 1M context window. 2.2x credit multiplier. Restart your IDE or CLI to access it from the model selector. Learn more ->

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Kiro Changelog · 2026-07-22

CLI: V2 to V3 Agent Migration

This release introduces /upgrade-agent to migrate V2 custom agent configurations to the universal format, automatic retries for interrupted model responses, and quality-of-life improvements across both modes.

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Kiro Changelog · 2026-07-17

CLI: Introspect Subagent and Global Hooks

This release brings two new capabilities to CLI 3.0 (early access) a built-in subagent for learning Kiro's features and global hooks that apply across all workspaces alongside error handling fixes for all users.

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Kiro Changelog · 2026-07-14

Models: OpenAI GPT-5.6 Sol, Terra, and Luna now available

OpenAI models are available in Kiro for the first time. GPT-5.6 Sol, Terra, and Luna bring three tiers of frontier intelligence to the IDE, CLI, and Web — each tuned for a different point on the performance-cost curve. Sol is the flagship, built for the hardest multi-step work: spec-driven implementation, long-horizon refactors, and complex terminal tasks. It scores 80 on the Coding Agent Index and 88.8% on Terminal-Bench 2.1. Terra is the balanced option for routine multi-step development at a fraction of flagship cost. Luna is the fastest, lowest-cost tier for high-frequency tasks where throughput matters most. All three run longer without supervision and can write lightweight programs that coordinate tools and process intermediate results, reducing round-trips and dead ends. Hidden chain-of-thought means you see final output only. 272K context window across all tiers. Kiro credit multipliers: Sol 2.4x, Terra 1.2x, Luna 0.6x. Experimental support is rolling out to Pro, Pro+, Pro Max, and Power customers in us-east-1 and eu-central-1 with cross-region inference. Learn more ->

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Kiro Changelog · 2026-07-09

CLI: Expanded MCP OAuth Support

MCP OAuth now supports servers with strict requirements, like Figma. Configure a client secret for servers that require one, point the redirect URI at a custom callback path, and skip Dynamic Client Registration when you bring your own client ID. This release also brings more accurate approval prompts for commands with combined flags, and full ASCII mode coverage for terminals without Unicode support.

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Kiro Changelog · 2026-07-09

CLI: Expanded MCP OAuth Support

MCP OAuth now supports servers with strict requirements, like Figma. Configure a client secret for servers that require one, point the redirect URI at a custom callback path, and skip Dynamic Client Registration when you bring your own client ID. This release also brings more accurate approval prompts for commands with combined flags, and full ASCII mode coverage for terminals without Unicode support. ...

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