Claude Sonnet 5.5 vs DeepSeek V4.1 Flash
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 Sonnet 5.5
DeepSeek V4.1 Flash
Intelligence
56
39.5
Coding
—
—
Math
—
—
Context window
1,000,000
1,000,000
Output price
$10/1M
$0.6/1M
Input price
$2/1M
$0.15/1M
Speed (t/s)
144
186
Knowledge cutoff
2026-06
2025-05
Open weights
No
Yes
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