Claude Opus 5.5 vs GPT-6 Luna
Which is the better AI model in 2026? Here's how they compare.
Domain intelligence profile
Artificial Analysis Intelligence Index by domain (0–100). Missing dimensions show as 0.
Head to head
Claude Opus 5.5
GPT-6 Luna
Intelligence
59.1
27.9
Engineering
65.3
33.3
Legal
58
32.2
Finance
59.4
33.9
Healthcare
57.9
34.8
Economics
60.3
34.5
Strategy & Ops
61.4
43.2
Context window
1,000,000
1,050,000
Output price
$20/1M
$0.5/1M
Input price
$4/1M
$0.1/1M
Speed (t/s)
95
114
Knowledge cutoff
2026-06
2026-05-18
Open weights
No
No
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