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Claude Fable 5.1 vs Kimi K3

Claude Fable 5.1Anthropic
Kimi K3Moonshot AI
Our take

Claude Fable 5.1 wins 4 of 4 categories, but Kimi K3 is 3.3× cheaper for everyday text work. Pick Claude Fable 5.1 when quality matters most, Kimi K3 at volume.

Overall92Best65
Coding89Best74
Writing90Best69
Support83Best73
Value73Best52
Input / 1M$10.00$3.00Best
Output / 1M$50.00$15.00Best
Blended / 1M$20.00$6.00Best
Context window1M1MBest
Open weightsNoYes
Released1 Sept 202616 Jul 2026

Your monthly bill

50k
Claude Fable 5.1$4.0k
Kimi K3$1.2kCheapest
List prices, a quarter of the tokens as output. Scores are provisional, from Arena and Epoch AI.