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GPT-5.5 (Xhigh)
Benchmark scores, pricing, speed and 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.
No benchmark data available for this model.