Claude Sonnet 5.5 vs DeepSeek Reasoner
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 Reasoner
Intelligence
56
—
Coding
—
—
Math
—
—
Context window
1,000,000
1,000,000
Output price
$10/1M
$0.28/1M
Input price
$2/1M
$0.14/1M
Speed (t/s)
144
—
Knowledge cutoff
2026-06
2025-09
Open weights
No
Yes
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