WhichAI / Compare / Kimi K3 vs Claude Opus 4.8

Kimi K3vsClaude Opus 4.8

Kimi K3 scores higher on the July 16 index. Full context below: price, context window, strengths and honest limits. Verified July 26, 2026.

Kimi K3

Claude Opus 4.8

Provider

AA index

57.1

55.7

Released

2026-07-16

n/a

Context

Price $/1M

$3 / $15

$5 / $25

Access

API $3/$15 per 1M tokens ($0.30 cached) · kimi.com chat · open weights announced for 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 16 flagship: 2.8T-parameter MoE with 1M context and native vision. #3 on the AA index (57.1), best published BrowseComp (91.2%) and #1 Frontend Code Arena at launch - the strongest agentic challenger to the US frontier.

Claude Opus 4.8: #2 on the public AA snapshot and the leader in real-repo coding (SWE-bench Pro 69.2%). For serious software work, still the default answer.

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