GPT-4.5

GPT-4.5

GPT-4.5 is a step forward in scaling up pre-training and post-training. With broader knowledge, improved intent understanding, and greater 'EQ', it excels at natural conversations, writing, programming, and practical problem solving with reduced hallucinations. GPT-4.5 achieved 62.5% accuracy on SimpleQA and a 37.1% hallucination rate, significantly outperforming GPT-4o and other models.

ConversationReasoningCode GenerationAnalysisSummarization
Provider
Openai
Release Date
2025-02-27
Size
XLARGE
Parameters
Not disclosed

Benchmark Performance

Performance metrics on industry standard AI benchmarks that measure capabilities across reasoning, knowledge, and specialized tasks.

MMLU

90.8%
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MATH

87.1%
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GPQA

69.5%
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SimpleQA

62.5%
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Model Insights

All Model Responses

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