Claude Fable 5.1 vs Claude Opus 5.5
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 Fable 5.1
Claude Opus 5.5
Intelligence
50
59.1
Engineering
57.2
65.3
Legal
53.7
58
Finance
53.5
59.4
Healthcare
50.5
57.9
Economics
56.3
60.3
Strategy & Ops
56.4
61.4
Context window
1,000,000
1,000,000
Output price
$50/1M
$20/1M
Input price
$10/1M
$4/1M
Speed (t/s)
60
95
Knowledge cutoff
2026-06
2026-06
Open weights
No
No
Compare more on the AI models hub.