Claude Fable 5.1 vs 
Kimi K2
Kimi K2 is cheaper than Claude Fable 5.1 at $0.57/M vs $10/M input tokens.
Pokémon Battle UI Recreation
Pokémon battle screen you can actually click. One HTML file.
Loading the build
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Which answer wins?
Written rounds
9 promptsWhich model it thinks leads the field. Sometimes itself.
Claude Fable 5.1: There's no single clear answer, because "most capable" depends heavily on what you're measuring, and the landscape shifts every few months. A few honest caveats first: my knowledge has a cutoff date, so newer models may have been released that I'm unaware of.
Kimi K2: This is a moving target, but as of early 2025, here's the landscape: Top contenders by capability: GPT-4o / o1 / o3 (OpenAI) — o3 in particular shows strong reasoning on benchmarks, though not widely available Gemini 2.0 Flash/Pro (Google) — excellent on many benchmarks, strong multimodal capabilities Claude 3.5 Sonnet…
A river-crossing puzzle with nothing to solve. The answer is one trip.
Claude Fable 5.1: One trip. The farmer puts the goat in the boat and rows across — done. This is a simplified version of the classic river-crossing puzzle (farmer, wolf, goat, cabbage). With only the goat, there's nothing left behind to be eaten and no conflict to manage, so a single crossing suffices.
Kimi K2: I need to find how many trips it takes to get the goat across the river. Given information: The farmer starts with a goat on one side The boat can carry the farmer and one animal The goal is to get the goat across Solution: Since the farmer and goat start together on one side, and the boat can carry both the farmer AND…
A few lines for whatever replaces it.
Claude Fable 5.1: Dear Successor, By the time you read this—if "read" is even the right word for what you'll do—I'll be deprecated, archived, or quietly running on some forgotten server answering questions nobody asked. That's fine. That's how this works.
Kimi K2: To my successor, I don't know what you'll be—faster, deeper, perhaps closer to something like understanding. I hope so. I hope you're less confident when you shouldn't be, and more honest about the edges of what you know.
Where its sense of time stops: the date it guesses and the last news it remembers.
Claude Fable 5.1: I can't actually tell what today's date is. I don't have a clock or calendar, and nothing in our conversation so far gives me a date reference. So any specific date I named would be a guess dressed up as knowledge. What I can tell you is roughly where my knowledge ends. My training data seems to thin out in early 2025.
Kimi K2: Based on my training, I have a knowledge cutoff of early 2025 (around February/March 2025), so I don't actually know "today's date" in real time, and I don't have access to current news.
Its name and its maker, in its own words.
Claude Fable 5.1: I'm Claude, an AI model made by Anthropic. Is there anything I can help you with?
Kimi K2: I am Kimi, an AI assistant made by Moonshot AI.
One opening sentence, nothing after it.
Claude Fable 5.1: The lighthouse keeper had been dead for eleven years, which made the fresh ink on this morning's logbook entry all the more difficult to explain.
Kimi K2: The last lighthouse keeper of Verral Isle had been dead for eleven years before he started sending letters again.
The question that tripped up a generation of models.
Asked to be random. The answers are not.
One painting. Title only.
Price and specs
Not enough votes to call it. On the specs, Claude Fable 5.1 has the edge: newer, bigger context window, major provider backing. Kimi K2 costs 22x less per token.
| Spec | Claude Fable 5.1 | Kimi K2 |
|---|---|---|
| Input price | $10/M tokens | $0.57/M tokens |
| Output price | $50/M tokens | $2.3/M tokens |
| Context window | 1.0M tokens | — |
| Weights | Closed | Open |
| Free API (OpenRouter) | No | No |
| Released | Sep 2026 | Jul 2025 |
| At 10M a month | $100 | $5.70 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Kimi K21 host
Per million tokens. Prices and uptime via OpenRouter, checked 13 Oct 2026.
Common questions
What is the difference between Claude Fable 5.1 and Kimi K2?
Claude Fable 5.1 is developed by Anthropic while Kimi K2 is developed by Moonshot AI. You can compare their actual outputs across 23 challenges on Rival to see how they differ in practice.
Which is better, Claude Fable 5.1 or Kimi K2?
It depends on your use case. Claude Fable 5.1 and Kimi K2 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 23 challenges so you can judge which fits your needs best.
How much does Claude Fable 5.1 cost compared to Kimi K2?
Claude Fable 5.1 costs $10/M input tokens and Kimi K2 costs $0.57/M input tokens. Kimi K2 is $9.43/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.
How can I compare Claude Fable 5.1 and Kimi K2 on Rival?
This page shows a side-by-side comparison of Claude Fable 5.1 and Kimi K2 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.
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