Claude Fable 5 vs Kimi K2.6
Anthropic Claude Fable 5 | Moonshot AI Kimi K2.6 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Moonshot AI |
| Release date | Jun 9 2026 | Apr 21 2026 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 1T |
Context window | 1M | 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. | 56% | 65%Best |
Agentic coding SWE-Bench ProCan the AI fix real bugs in real software? It's handed actual problems from open-source projects and has to write code that genuinely solves them. Higher is better. | 80.3% | — |
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. | 95.5%Best | 80.2% |
Agentic coding CursorBench v3.1Cursor's own test of harder, real-world coding tasks inside a code editor. Higher is better. | 72.9%Best | 47.6% |
Agentic coding DeepSWE 1.0Artificial Analysis' independent test of deep, agentic software-engineering work — the AI has to plan and carry out substantial coding tasks end to end. Higher is better. | 66.1% | — |
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. | 92%Best | 67% |
Agentic terminal coding Terminal-Bench 2.1Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Higher is better. | 88% | — |
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% |
Agentic computer use OSWorld-VerifiedCan the AI actually operate a computer — clicking, typing, and using real apps — to finish tasks on its own? Higher is better. | 85% | — |
Agentic legal work Harvey's Legal Agent BenchmarkHarvey's test of whether an AI agent can complete real legal work — drafting and reviewing documents, working with spreadsheets and presentations, and navigating files the way a lawyer's assistant would. Higher is better. | 11.25% | — |
Tax questions TaxEval v2A set of real tax questions created by Vals AI — can the AI give accurate answers about tax rules and filings? Higher is better. | 76.94% | — |
Medical admin work MedScribeCan the AI support doctors with their administrative work, like notes and paperwork? Created by Vals AI. Higher is better. | 88.52% | — |
Knowledge work GDPval-AAMeasures how well the AI does economically valuable knowledge work, judged against human experts. Shown as a rating (like a chess Elo) — higher is better. | 1932 | — |
| Timeline | ||
| Release gap | Kimi K2.6 shipped 49 days before Claude Fable 5 | |
Which is better: Claude Fable 5 or Kimi K2.6?
Claude Fable 5 leads Kimi K2.6 on 3 of the 4 benchmarks they both report (BullshitBench v2, SWE-Bench Verified, CursorBench v3.1, Next.js Evals). Kimi K2.6 shipped 49 days before Claude Fable 5, so benchmark comparisons should account for the intervening progress.
Context windows are 1M (Claude Fable 5) vs 256k (Kimi K2.6). Claude Fable 5 is proprietary, while Kimi K2.6 is open weight.
On BullshitBench v2, Kimi K2.6 leads at 65% vs Claude Fable 5 at 56%. On SWE-Bench Verified, Claude Fable 5 leads at 95.5% vs Kimi K2.6 at 80.2%. On CursorBench v3.1, Claude Fable 5 leads at 72.9% vs Kimi K2.6 at 47.6%. On Next.js Evals, Claude Fable 5 leads at 92% vs Kimi K2.6 at 67%.
Frequently asked questions
Claude Fable 5 was released by Anthropic on Jun 9 2026.
Kimi K2.6 was released by Moonshot AI on Apr 21 2026.
Claude Fable 5 leads on SWE-Bench Verified — Claude Fable 5 95.5% vs Kimi K2.6 80.2%.
Claude Fable 5 has a 1M context window; Kimi K2.6 has 256k.
Claude Fable 5 is a proprietary model released by Anthropic. Kimi K2.6 is an open weight model released by Moonshot AI.