Compare
Kiro Pro vs Antigravity (Google AI Pro): Which Agentic IDE Plan to Pay For
Kiro Pro vs Antigravity on Google AI Pro: monthly price, credits vs quotas, models, free tiers and student deals, and which runs out first for agent work.
7 min read
Kiro prices, credits and models checked Nov 1, 2026 on kiro.dev/pricing, with billing details from Kiro’s billing docs (Nov 2, 2026). Google AI Pro prices checked Nov 2, 2026 on gemini.google/subscriptions; Antigravity limits and models from Google’s plans doc and models doc (Nov 3, 2026). US prices, before tax. Every source is listed at the bottom. No affiliate links on this page (how we work).
The finding first: Kiro Pro is $20 a month. Antigravity’s paid route is Google AI Pro at $19.99 a month. So they’re a cent apart, not the same price. Google also sells AI Pro yearly at $199.99. Kiro says plainly that it has no annual option.
Under the price tag, they bill in completely different ways. Kiro gives you a pile of credits (1,000 a month on Pro) that every agent action draws from. Antigravity gives you a quota that Google says is “refreshed every five hours until the weekly limit is reached”, and Google never prints a number for it. One is a fuel gauge. The other is a bar tab where the bartender won’t tell you your limit.
Kiro Pro vs Antigravity: the short answer
- Price: $20 vs $19.99 a month. Not the same, but close enough that price shouldn’t decide this.
- You want a usage number you can plan around: Kiro Pro. 1,000 credits, a dashboard Kiro says is “updated at least every 5 minutes”, and add-on credits at $0.04 each.
- You want Gemini 4 Argon plus Claude Opus 5.5 in an agent IDE and a refill every five hours: Antigravity on Google AI Pro.
- You want more than the IDE (5 TB of storage and the rest of Google’s bundle): Google AI Pro. Kiro sells only Kiro.
- You’re new to Kiro: since Nov 1, 2026, your first Pro upgrade gets the rest of the month free plus 500 trial credits.
At a glance
| Item | Kiro Pro | AI Pro (Antigravity) |
|---|---|---|
| Monthly | $20 | $19.99 |
| Yearly | No annual option | $199.99 |
| Usage unit | 1,000 credits | Quota, no number |
| Reset | Monthly, no rollover | Every 5 hours + weekly |
| Overage | $0.04 per credit | AI credits, price not published |
| Top models | Claude Opus 5, GPT-5.6 Sol | Gemini 4 Argon, Claude Opus 5.5 |
| Free tier | 50 credits | Weekly quota |
| Students | 1,000 credits/mo, 1 year | 12-month AI Pro trial (US) |
| Intro offer | Rest of month + 500 credits | Not published |
Kiro: Pro “$20 per user/month”, 1,000 credits; Free 50 credits; add-on credits $0.04; subscriptions processed on the 1st of each calendar month; no annual option (kiro.dev/pricing, verified Nov 1, 2026). Google: AI Pro $19.99/mo or $199.99/yr, “Entry rate limits to agent model in Google Antigravity” (gemini.google/subscriptions, verified Nov 2, 2026). Antigravity Pro quota and Free quota wording from the plans doc (verified Nov 3, 2026). Students: kiro.dev/students (Nov 1, 2026) and gemini.google/students (Oct 29, 2026).
Gap, stated plainly: $0.01 a month (our arithmetic). Paying yearly, Google AI Pro works out to $199.99, against $240 for twelve months of Kiro Pro, a $40.01 difference (our arithmetic from the published prices).
Limits: Kiro credits vs Antigravity quotas
Credits and quotas don’t convert into each other. Kiro doesn’t say how many tokens a credit buys, and Google doesn’t publish any Antigravity quota number. Anyone showing you a neat exchange rate is running full Chicanery: it looks airtight until somebody checks the pocket for a battery.
Kiro Pro. Credits are spent by vibe mode, spec mode, spec refinement, task execution and agent hook execution, and they’re metered to 0.01. “Usage limits reset at the start of each billing month. Unused credits do not roll over.” You get a notification at 80% usage. Once plan credits are gone, add-on packs start at $5 for 125 credits, go up to $100, can be stacked up to 5 packs, expire after 12 months and do roll over. Run out of both and “Kiro pauses usage until you purchase more add-on credits or your plan resets.” Free accounts can’t buy add-ons (pricing and add-on credits doc, verified Nov 1, 2026).
Credits work in the Kiro IDE, CLI, Web, Crew, ACP-compatible IDEs and CI/CD. Third-party harnesses are “not permitted.” Models on the pricing page: GPT-5.6 (Sol, Terra, Luna), Claude Opus 5, Opus 4.8, Sonnet 5, Sonnet 4.6, Sonnet 4.5, Haiku 4.5, DeepSeek 3.2, MiniMax M2.5, GLM-5, Qwen3 Coder Next, with Auto as the default (verified Nov 1, 2026). How fast each model burns credits is covered in Kiro usage limits.
Antigravity on Google AI Pro. Google’s plans doc (verified Nov 3, 2026): “A high, generous quota, refreshed every five hours until the weekly limit is reached” and “A higher weekly rate limit.” Every plan, Free included, gets “Unlimited Tab completions”, scheduled tasks and the CLI. When the quota runs out, Pro and Ultra users can turn on AI credit overages (setting “Never” or “Always”). There’s no bring-your-own-key. Check what’s left with /usage (alias /quota) in the Antigravity CLI (CLI reference, verified Nov 2, 2026).
Models on AI Pro (models doc, Nov 3, 2026): Gemini 4 Argon, Gemini 3.8 Flash, and Claude Sonnet 5.5 and Opus 5.5, which are “Available on Google AI Pro for non-trial subscriptions only.” That caveat matters if you’re on the student trial.
So which runs out first for agent work? Not answerable from published data. What you can say: Kiro runs out once a month and tells you how close you are. Antigravity can run dry inside a five-hour window and come back, until the weekly limit says no.
Free options
Kiro Free gives you 50 credits a month, and you can’t top it up with add-ons. Fine for kicking the tyres on spec mode; not enough for real agent work. More in Is Kiro free?.
Antigravity Free is “$0/month” with “Basic weekly rate limits”, “Unlimited Tab completions” and “Unlimited Command requests” (Antigravity pricing, verified Oct 28, 2026). The plans doc calls it “A meaningful quota, refreshed weekly”, with Gemini 3.8 Flash available on all plans. It’s Saul hiding out as Gene at the Cinnabon: same skills, much smaller stage. Google AI Plus sits between Free and Pro, with “Limited” agent requests against Pro’s “Expanded” (Google One plans, verified Oct 29, 2026). The full breakdown is in Antigravity Plus vs Pro and Is Antigravity free?.
Students. Kiro: “Eligible university students get 1,000 credits per month free for one year.” That’s the Pro credit allowance at no cost. Google: US college students 18+ get a “12-month trial” of Google AI Pro, redeemable until Dec 31, 2026, then $19.99 a month (Google One help, verified Oct 29, 2026). The Claude models in Antigravity aren’t included on trial subscriptions.
The Kiro first-upgrade offer. Kiro’s pricing page (Nov 1, 2026): “when you first upgrade to Pro, you’ll get the rest of the month free, plus 500 trial credits to use within 12 months.” It’s prorated to the second, trial credits are used after your plan credits, a card is required, and it only applies to your first upgrade. Kiro’s billing docs show a day-15 upgrade getting 533 prorated Pro credits plus the 500 trial credits for $0 that month, and note “Trial credits don’t reset at the end of the month” (verified Nov 2, 2026). Kim Wexler finger guns are appropriate.
Here’s what I’d do
- Spec-driven work where you want to see the meter: Kiro Pro. Take the first-upgrade offer, watch the 80% notification, and only buy add-on packs once you’ve seen a full month of usage.
- Long agent sessions, Gemini-first, and a five-hour refill suits your day: Google AI Pro for Antigravity. Leave overages on “Never” until you know your pattern, because Google doesn’t publish the AI credit price.
- You’ll stay a year: Google AI Pro yearly at $199.99 beats twelve months of Kiro Pro at $240 on price alone. Kiro doesn’t offer annual billing.
- Student: Kiro’s 1,000 credits a month is the cleaner deal for agent work. Google’s trial is broader, but it doesn’t include the Claude models in Antigravity.
- Comparing against Cursor too: see Kiro vs Cursor and Antigravity vs Cursor. Need more Kiro? Kiro Pro vs Pro+. Everything else: AI coding tools compared.
FAQ
Kiro Pro vs Antigravity: do they cost the same? No, Kiro Pro is $20 a month and Google AI Pro, which unlocks Antigravity’s paid quota, is $19.99 a month.
Is Kiro Pro better than Antigravity? Kiro Pro is better if you want 1,000 metered credits and add-ons at $0.04; Antigravity is better if you want Gemini 4 Argon and Claude Opus 5.5 on a quota that refreshes every five hours.
Is Antigravity included in Google AI Pro? Yes, Google AI Pro includes Antigravity with a quota refreshed every five hours until a weekly limit, plus Claude Sonnet 5.5 and Opus 5.5 on non-trial subscriptions.
Which is cheaper, Kiro or Antigravity? Monthly they’re a cent apart, and over a year Google AI Pro at $199.99 is cheaper than twelve months of Kiro Pro at $240, since Kiro has no annual option.
Sources
- Kiro, Pricing (plans, credits, add-on price, first-upgrade offer, models, surfaces): https://kiro.dev/pricing/ (verified 2026-11-01)
- Kiro docs, Billing (proration example, trial credits): https://kiro.dev/docs/billing/ (verified 2026-11-02)
- Kiro docs, Add-on credits (pack sizes, expiry, pause rule): https://kiro.dev/docs/billing/add-on-credits/ (verified 2026-11-01)
- Kiro, Students (1,000 credits a month for one year): https://kiro.dev/students/ (verified 2026-11-01)
- Google, Gemini subscriptions (AI Pro price, Antigravity wording): https://gemini.google/subscriptions/ (verified 2026-11-02)
- Google One, Google AI plans (agent requests by tier, storage): https://one.google.com/about/google-ai-plans/ (verified 2026-10-29)
- Google Antigravity docs, Plans (quotas, weekly limits, overages, no BYOK): https://antigravity.google/docs/plans (verified 2026-11-03)
- Google Antigravity docs, Models (models on AI Pro, trial caveat): https://antigravity.google/docs/models (verified 2026-11-03)
- Google Antigravity, Pricing (Free plan cards): https://antigravity.google/pricing (verified 2026-10-28)
- Google Antigravity docs, CLI reference (/usage and /quota): https://antigravity.google/docs/cli/reference (verified 2026-11-02)
- Google, Gemini for students and Google One help (US student trial terms): https://gemini.google/students/ and https://support.google.com/googleone/answer/17422238 (verified 2026-10-29)