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"OpenAI’s GPT-5" is ambiguous. Does that mean GPT-5, 5.1, 5.2, 5.3, or 5.4? Does it include the full model, or the nano/mini variants?

GPT-5 is not ambiguous, it's the official name of the model that released in August last year.

> All evaluations were done in March - August 2025.

while true, all the others got precise identifiers but for openAI it makes it hard to reproduce because i have no idea "which" GPT-5 was used.

It was called just GPT-5 at that point in time.

In that case, what tokenizer version? What was the temperature set to? topk? topp? FP32? FP16? Quantized? Hopper? Blackwell?