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OpenAI GPT-4.5 System Card

OpenAI Blog 27 February 2025, 12:00

OpenAI released a research preview of GPT-4.5, described as its largest and most knowledgeable model to date. The announcement included a system card detailing the model's capabilities and safety properties, though no specific performance benchmarks or pricing were disclosed. Researchers and developers can now access GPT-4.5 for testing and evaluation purposes.

Why it matters

We’re releasing a research preview of OpenAI GPT‑4.5, our largest and most knowledgeable model yet.

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TLDRocket 21 July 2026

The open-weight AI model market hit an inflection point today as Alibaba and Kimi released trillion-parameter competitors that challenge the closed-model orthodoxy—just as Washington moved to restrict them. Alibaba's Qwen 3.8 Max (2.4 trillion parameters) and Kimi K3 (2.8T) are going open-weight, with K3 ranking first on Frontend Web App Arena and fourth on agentic benchmarks, signaling that scale and transparency can coexist. The timing matters: while U.S. policymakers weigh layered restrictions on Chinese open models, technical experts are pushing back hard, arguing that closed gardens actually hurt security and competition more than they help. The real fragmentation risk isn't technical—it's regulatory.

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OpenAI GPT-4.5 System Card

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