Short answer, then the detail.
For Tracking overseas reaction while it happens; English technical questions, Grok is the more direct fit. For Reading long reports and papers; Organizing Chinese source material, Kimi gets there with less fighting.
Both have free tiers, so cost only separates them once you hit the limits. Kimi takes more text in one go (1,048,576 tokens (K3 series); 262,144 tokens on the K2 series (checked 2026-10-29) vs 500K tokens (grok-4.7) (checked 2026-10-29)), which matters for whole books, long contracts and big codebases.
| Dimension | Grok | Kimi |
|---|---|---|
| Free tier | Yes | Yes |
| Pricing | X Subscription: Free $0; Plus $8/mo; Premium $30/mo; Super $100/mo; Ultra $200/mo (annual billing discounted) (checked 2026-10-29) | Membership annual plans work out to CNY 39 / 79 / 159 / 559 / 1,119 per month, alongside a free tier; API K3.1 Pro CNY 13 input and CNY 68 output per million tokens (CNY 1.3 on cache hits) (checked 2026-10-29) |
| Context window | 500K tokens (grok-4.7) (checked 2026-10-29) | 1,048,576 tokens (K3 series); 262,144 tokens on the K2 series (checked 2026-10-29) |
| Platforms | Web, iOS, Android | Web, iOS, Android |
| Best for | Tracking overseas reaction while it happens; English technical questions; X creators who post all day | Reading long reports and papers; Organizing Chinese source material; Light agent and research tasks |
| Availability | No mainland China edition; reaching it from there needs a proxy or VPN (checked 2026-10-29). | Directly reachable in mainland China with no proxy, and platform.kimi.com serves the China region (checked 2026-10-29). |
Tracking overseas reaction while it happens; English technical questions; X creators who post all day. Its strongest point: Reads live X posts and groups how a topic is argued. Watch out for: States guesses in the same tone as confirmed facts.
Reading long reports and papers; Organizing Chinese source material; Light agent and research tasks. Its strongest point: Swallows a whole book and answers against the full text. Watch out for: Concurrency limits bite at Chinese peak times.
Running both is not wasteful here: one earns its keep on retrieval and tool use, the other on long text you intend to keep.
Grok if you want Tracking overseas reaction while it happens. Kimi if Reading long reports and papers. Neither has a learning curve worth worrying about past the first day.
Yes — both have free tiers, and the pair covers more ground than either alone.
Kimi takes more text in one go (1,048,576 tokens (K3 series); 262,144 tokens on the K2 series (checked 2026-10-29) vs 500K tokens (grok-4.7) (checked 2026-10-29)), which matters for whole books, long contracts and big codebases.