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"time to GPT-2", down to 2.91 hours

twitter.com

February 4, 2026

2 min read

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47/100

Summary

Enabled fp8 training for GPT-2 resulted in a 4.3% reduction in training time, bringing it down to 2.91 hours. Using 8XH100 spot instance prices, the cost to reproduce GPT-2 is approximately $20.

Key Takeaways

fp8 training has improved the time to train GPT-2 by 4.3%, reducing it to 2.91 hours.
Using 8XH100 spot instance prices, the cost to reproduce GPT-2 is approximately $20.
The performance of fp8 training is not fully compute bound due to overhead from scale conversions, resulting in a speedup of about 7.3%.
Future improvements in fp8 training may be achieved by selectively applying it to specific layers and optimizing numerics across the network.

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Community Sentiment

Mixed

Positives

The rapid reduction in training time to 2.91 hours for GPT-2 highlights advancements in computational efficiency, making AI model training more accessible for developers.

Concerns

The initial decision to withhold GPT-2 due to safety concerns raises questions about transparency and motivations behind AI development, suggesting potential ulterior motives.