WhichAI / Compare / Kimi K3 vs Claude Opus 4.8

Kimi K3vsClaude Opus 4.8

Kimi K3 scores higher on the September 8, 2026 index. Full context below: price, context window, strengths and honest limits. Verified September 8, 2026.

Kimi K3

Claude Opus 4.8

Provider

AA index

59.7

57.3

Released

2026-07-16

n/a

Context

Price $/1M

$3 / $15

$5 / $25

Access

API $3/$15 per 1M tokens ($0.30 cached) · free kimi.com chat · open weights on Hugging Face (July 27, Modified MIT)

Claude Pro $20/mo · API

n/a = not published or not yet verified. Scores marked ~ are WhichAI estimates and should not be compared 1:1 with measured scores.

In one line each

Kimi K3: Moonshot's July flagship: 2.8T-parameter MoE, 1M context, native vision, and the best published BrowseComp score (91.2%). The strongest agentic challenger to the US frontier, and the largest model whose weights you can actually download.

Claude Opus 4.8: The leader on real-repo coding when it shipped (SWE-bench Pro 69.2%) and still a serious software workhorse, now at a price its successors undercut. Worth choosing deliberately rather than by default.

Compare them live in the app Which one is right for you? 30-second finder