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Claude Opus 5 vs Kimi K3

Claude Opus 5Anthropic
Kimi K3Moonshot AI
Our take

Claude Opus 5 wins 4 of 4 categories, but Kimi K3 is 1.7× cheaper for everyday text work. Pick Claude Opus 5 when quality matters most, Kimi K3 at volume.

Overall86Best65
Coding84Best74
Writing86Best69
Support84Best73
Value71Best52
Input / 1M$5.00$3.00Best
Output / 1M$25.00$15.00Best
Blended / 1M$10.00$6.00Best
Context window1M1MBest
Open weightsNoYes
Released24 Jul 202616 Jul 2026

Your monthly bill

50k
Claude Opus 5$2.0k
Kimi K3$1.2kCheapest
List prices, a quarter of the tokens as output. Scores are provisional, from Arena and Epoch AI.