Claude Opus 5.5 vs GPT-6 Luna
Which is the better AI model in 2026? Here's how they compare.
Capability profile
Artificial Analysis indices (0–100). Missing dimensions show as 0.
Head to head
Claude Opus 5.5
GPT-6 Luna
Intelligence
57.6
38.1
Coding
—
—
Math
—
—
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)
98
132
Knowledge cutoff
2026-06
2026-05-18
Open weights
No
No
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