Claude Fable 5.1 vs GPT-5.6 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 Fable 5.1
GPT-5.6 Luna
Intelligence
53.4
37.3
Coding
81.6
71.4
Math
—
—
Context window
1,000,000
1,050,000
Output price
$50/1M
$1.2/1M
Input price
$10/1M
$0.2/1M
Speed (t/s)
69
0
Knowledge cutoff
2026-06
2026-02-16
Open weights
No
No
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