Claude 1vsKimi K2.6
Claude 1 | Kimi K2.6 | |
|---|---|---|
| Specifications | ||
Parameters | — | 1T |
Context window | 9k | 256k |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | — | 65% |
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | — | 80.2% |
Agentic coding CursorBench v3.1Cursor's own test of harder, real-world coding tasks inside a code editor. Higher is better. | — | 47.6% |
Next.js coding Next.js EvalsVercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | — | 67% |
Competitive coding LiveCodeBenchCoding problems published so recently the AI can't have seen them in training — a contamination-free test of raw programming skill. Higher is better. | — | 89.6% |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 90.5% |
Community preference Arena Elo (Text)Real people chat with two anonymous AIs side by side and vote for the answer they prefer. Votes become a chess-style Elo rating on arena.ai — it measures which AI people actually like, not test scores. Higher is better. | — | 1461 |
Community preference (code) Arena Elo (Code)Like the text arena, but people vote on which AI writes better code. The votes become a chess-style Elo rating on arena.ai. Higher is better. | — | 1513 |
| Overview | ||
| Company | Anthropic | Moonshot AI |
| Release date | Mar 14 2023 | Apr 21 2026 |
| Access | Proprietary | Open Weight |
Which is better: Claude 1 or Kimi K2.6?
Claude 1 and Kimi K2.6 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 1 shipped 1134 days before Kimi K2.6, so benchmark comparisons should account for the intervening progress.
Context windows are 9k (Claude 1) vs 256k (Kimi K2.6). Claude 1 is proprietary, while Kimi K2.6 is open weight.
Direct benchmark comparisons are unavailable — Claude 1 and Kimi K2.6 don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude 1 was released by Anthropic on Mar 14 2023.
Kimi K2.6 was released by Moonshot AI on Apr 21 2026.
Claude 1 has a 9k context window; Kimi K2.6 has 256k.
Claude 1 is a proprietary model released by Anthropic. Kimi K2.6 is an open weight model released by Moonshot AI.
Other comparisons
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