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GPT-5.5 (xhigh)

OpenAI

Frontier ModelReasoningVision ModelProprietary

Analysis of OpenAI's GPT-5.5 (xhigh) and comparison to other AI models across key metrics including quality, price, performance (tokens per second & time to first token), context window & more.

Context

Release Date
Apr 23, 2026
Window
922k

PricingPer 1M tokens

Input
$5
Output
$30
Blended 3:1
$11.25

Capabilities

Speed
66 t/s
Input
Output
Reasoning tokens

Latency

TTFT
78.39 ms
500 token response
85.98 s

Benchmarks

Reasoning
●●●○○
Coding
●●●○○
GPQA
93.5%
HLE
44.3%
SciCode
56.1%

Analysis of OpenAI's GPT-5.5 (xhigh) and comparison to other AI models across key metrics including quality, price, performance (tokens per second & time to first token), context window & more.