Claude Opus 5.5 vs DeepSeek V4 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 Opus 5.5
DeepSeek V4 Flash
Intelligence
57.6
24.8
Coding
—
52
Math
—
—
Context window
1,000,000
1,000,000
Output price
$20/1M
$0.6/1M
Input price
$4/1M
$0.15/1M
Speed (t/s)
97
0
Knowledge cutoff
2026-06
2025-05
Open weights
No
Yes
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