Claude Opus 5.5 vs GPT-Realtime-2.1
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
GPT-Realtime-2.1
Intelligence
57.6
—
Coding
—
—
Math
—
—
Context window
1,000,000
128,000
Output price
$20/1M
$24/1M
Input price
$4/1M
$4/1M
Speed (t/s)
97
—
Knowledge cutoff
2026-06
2024-09-30
Open weights
No
No
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