Google Antigravity vs Kiro (2026)

Google Antigravity

by Google

Kiro

by Amazon Web Services

Pros

• ✓Runs several agents in parallel and reports through Artifacts such as plans, walkthroughs, screenshots and browser recordings, which developers can comment on while the agent keeps working.
• ✓Works from a desktop agent manager, a standalone IDE, a CLI, a Python SDK, and extensions for Visual Studio Code, Visual Studio, JetBrains IDEs, Zed and Xcode, plus Eclipse in preview.
• ✓Google Antigravity's free individual tier includes Gemini 3.8 Flash, Claude Sonnet 4.6, Claude Opus 4.6 and GPT-OSS 120B, with unlimited Tab completions.
• ✓Connects to MCP servers through an MCP Store listing more than 70, and runs terminal commands in a sandbox under a configurable permission system.

Limitations

• –Paid tiers are Google AI subscriptions, Pro at $19.99 per month and Ultra from $99.99, with usage set by quota refreshes and weekly limits rather than a published request count.
• –Google Antigravity does not support bring-your-own API keys, Gemini 4 Argon is not on the free plan, and GPT-OSS 120B is not available on the Enterprise plan.
• –On individual plans Google may use interactions to improve its products and models, and human reviewers may see them, unless the user opts out in settings.
• –Available to personal Google accounts for people aged 18 or over in approved countries, and enterprise sign-in for JetBrains, Zed, Xcode and Eclipse is in preview.

Pros

• ✓Spec-driven development expands a prompt to requirements, a design and a task list before any code is written, and Workflows, steering, hooks and memory across sessions let teams shape how the agent plans and carries out work.
• ✓Wide model choice: Auto routes across frontier and specialized models, and users can pick Claude Opus 5.5, Sonnet 5.5 and Haiku 5.5, GPT-5.6 in three sizes, or open weight models such as Kimi K3, GLM-5 and Qwen3 Coder Next.
• ✓HIPAA eligibility, ISO/IEC 27001:2022 coverage and FedRAMP Class C and D scope through AWS, plus a perpetual free tier, a free year for eligible students and no AWS account needed to start.

Limitations

• –Credits make cost forecasting harder than flat per-seat pricing, since simple prompts use under 1 credit, complex spec tasks use more, models draw credits at different rates, and unused plan credits do not roll over.
• –Content from Free Tier users and individual subscribers who sign in with a social login or AWS Builder ID may be used for model training unless they opt out, while enterprise and IAM Identity Center users are excluded.
• –Kiro is not on AWS's SOC services-in-scope list, and AWS Artifact audit reports are unavailable to users who signed in with GitHub or Google rather than an AWS Builder ID or IAM Identity Center.