All tasks / Comparisons

Claude Fable 5.1 vs Kimi K3

Compared only on public benchmark results, across the 8 tasks where both are listed: Claude Fable 5.1 is a tier higher in 4 of 8 shared tasks, they share a tier in 3.

Claude Fable 5.1

Anthropic's highest-priced Claude tier, positioned for demanding reasoning and long-horizon agentic work.

Vendor: Anthropic
Weights: Closed: API and apps only
Released: 1 Sep 2026
API price: $10 in / $50 out per 1M tokens
License: proprietary
Last verified: 18 Oct 2026

Alternatives to Claude Fable 5.1

Kimi K3

Moonshot AI's open-weights Kimi MoE line; Kimi K3 has 2.8T total and 104B activated parameters and 1M context.

Vendor: Moonshot AI
Weights: Open: run it yourself
Released: Jul 2026
API price: $3 in / $15 out per 1M tokens
GPU memory to run locally: ~1600 GB
License: Kimi K3 License
Last verified: 18 Oct 2026

Alternatives to Kimi K3

Task by task

Task	Claude Fable 5.1	Kimi K3	Higher tier
Chat & assistants Models	S1,502 on LMArena Text Arena (overall, style control) · Cloud	S1,487 on LMArena Text Arena (overall, style control) · Local	Same tier
Writing Models	S1,485 on LMArena Text Arena: Creative Writing (style control) · Cloud	A1,461 on LMArena Text Arena: Creative Writing (style control) · Local	Claude Fable 5.1
Documents & OCR Models	–No public result yet · Cloud	–No public result yet · Local	—
Coding Models	A1,742 on LMArena WebDev / Code Arena (overall) · Cloud	B1,655 on LMArena WebDev / Code Arena (overall) · Local	Claude Fable 5.1
Image understanding Models	S1,286 on LMArena Vision Arena (overall, style control) · Cloud	A80.5% on Artificial Analysis MMMU-Pro (independent evaluation) · Local	Claude Fable 5.1
Vector graphics & logos Models	C1,300 on Design Arena SVG · Cloud	C1,300 on Design Arena SVG · Local	Same tier
Workflow automation Models	C59.4% on AutomationBench-AA (Artificial Analysis) · Cloud	C58.3% on AutomationBench-AA (Artificial Analysis) · Local	Same tier
Slides & presentations Models	S1,328 on Design Arena Python-PPTX Slides · Cloud	A1,273 on Design Arena Python-PPTX Slides · Local	Claude Fable 5.1

A tier spans a range of scores, and small gaps on a leaderboard are often within its margin of error, so only a different tier counts as ahead. How we rank.

Same benchmark, both results

Benchmark	Claude Fable 5.1	Kimi K3	Snapshot
Artificial Analysis Intelligence Index Composite index over Artificial Analysis' own evaluation suite, higher is better	53 Claude Fable 5.1 (Max, Default Fallback)	44 Kimi K3 (Max)	18 Oct 2026
AutomationBench-AA (Artificial Analysis) Score: average share of each task's objectives completed across 657 business-workflow tasks in 40 simulated SaaS apps via REST APIs; a task with any guardrail (business-rule) violation scores zero, higher is better	59.4% Claude Fable 5.1 (Max, Default Fallback)	58.3% Kimi K3 (Max)	19 Oct 2026
Design Arena Python-PPTX Slides Elo rating from crowdsourced blind pairwise votes on PowerPoint decks that models build with python-pptx in Design Arena's agent harness, higher is better	1,328 Claude Fable 5.1	1,273 Kimi K3	18 Oct 2026
Design Arena SVG Elo rating from crowdsourced blind pairwise votes on SVG markup that models generate from a prompt (icons, illustrations, diagrams, artistic compositions), higher is better	1,300 Claude Fable 5.1	1,300 Kimi K3	19 Oct 2026
EQ-Bench Creative Writing v3 Elo score from LLM-judged pairwise comparisons of creative-writing outputs (rubric score shown alongside), higher is better	2,162 claude-fable-5-1	2,082 kimi-k3	24 Sep 2026
LMArena Text Arena (overall, style control) Arena score (Bradley-Terry rating from pairwise human votes, style-controlled default view), higher is better	1,502 Claude Fable 5.1 (Max)	1,487 Kimi K3 (Max)	15 Oct 2026
LMArena Text Arena: Creative Writing (style control) Arena score (Bradley-Terry rating from pairwise human votes, creative-writing prompts only, style-controlled view), higher is better	1,485 Claude Fable 5.1 (Max)	1,461 Kimi K3 (Max)	15 Oct 2026
LMArena WebDev / Code Arena (overall) Arena score (Bradley-Terry rating from pairwise human votes on web-app generation), higher is better	1,742 Claude Fable 5.1 (Max)	1,655 Kimi K3 (Max)	18 Oct 2026
SWE-Bench Pro V2 (public set, full) Resolve rate on 642 validated long-horizon tasks from 11 copyleft repositories, re-graded on a pristine image under a locked offline protocol, higher is better	99.1% Fable 5.1 (Claude Code) high	97.7% Kimi-K3 (mini-swe-agent) max	19 Oct 2026