AI Benchmark Model
GPT-5.5 (xhigh)
Benchmark scores, pricing, speed, and model comparisons for GPT-5.5 (xhigh).
Key scores
GPT-5.5 (xhigh) is an artificial intelligence model developed by OpenAI and released on April 23, 2026. The model achieves an intelligence index of 60.2 and a coding index of 59.1, while its math index remains unknown. Performance metrics indicate an output speed of 68.227 tokens per second and a time to first token of 47.763 seconds. Pricing for the model is set at $5.00 per million input tokens and $30.00 per million output tokens, resulting in a blended rate of $11.25 per million tokens. Benchmark results include a GPQA score of 0.935, HLE of 0.443, SciCode of 0.561, IFBench of 0.759, LCR of 0.743, TerminalBench Hard of 0.606, and TAU2 of 0.939.
Benchmark results
7 tracked benchmark rows for GPT-5.5 (xhigh).
TAU2 Other
93.9% GPQA Reasoning
93.5% IFBench Other
75.9% LCR Other
74.3% TerminalBench Hard Other
60.6% SciCode Other
56.1% HLE Other
44.3%
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