Kimi K3 Credit Limits on kimi.com: Why Your "Free" Access Runs Out
Moonshot's Kimi K3 — a 2.8-trillion-parameter, open-weight model with native vision and a 1M-token context window — is easy to try on kimi.com. It's also easy to run out of trial faster than you'd expect, because K3 is metered by credits while Kimi's older model isn't.
If you just want a K3 chat window open right now, use Kimi K3 on aiwith.chat — a free K3 chat with no credit meter and no Chinese phone number. This page is about the other question: how Moonshot's own credit system works, and when it starts costing you.
K2.6 is uncapped, K3 is metered
Create an account at kimi.com (or the mobile app) and the chat opens on K2.6 by default — that model doesn't consume any credits in chat, so there's no meter running. Switch the model dropdown to K3 (or K3 Swarm) and the picture changes: both are billed by credits. New accounts get a starting credit allowance, but once it's used, K3 access stops until you top up or the allowance refreshes.
That's the distinction most write-ups blur. K2.6 is a free tier. K3 is a capped trial — you can try it without a card, but it isn't something to rely on for daily work.
Rate limits stack on top of credits
Even inside your credit balance, tasks hit concurrency caps on 5-hour and 7-day windows. A long-running task already in flight will finish, but new ones queue until the window resets. So there are two separate ceilings — how many credits you have left, and how many tasks you're allowed to have running — and hitting either one stops you.
Sign-up is region-gated
kimi.com only accepts phone numbers and emails from supported regions, and rejects VoIP numbers and landlines, so verification can fail outright depending on where you are. Google login works as a fallback. If SMS is flaky, the reliable path is verifying in the mobile app first, then scanning the QR code to log in on desktop.
When topping up stops making sense
If K2.6 covers what you need, kimi.com's free chat is the simplest option — there's no reason to pay for that.
The calculation changes if you specifically want K3's longer context or vision on an ongoing basis. Credit-metered access means checking a balance mid-task, and topping up only buys more of the same model. A flat-rate plan is worth comparing at that point: aiwith.chat bundles Kimi K3 into $9.9/month alongside GPT-6, Claude Fable 5.1, Gemini 3.1 Pro and DeepSeek V4.1 Flash — one price, no per-model credit tracking, and you can switch models on the same thread to compare K3 against GPT-6 or Gemini on the same prompt.