Observed Signal · Feb 27, 2025 · Product Launch · Source: Trending Topics · Impact: 4/5 · Sentiment: Positive
OpenAI Launches GPT-4.5 Preview, Says It Won't Beat Benchmarks
OpenAI unveiled GPT-4.5, the successor to GPT-4o, initially as a research preview. The company calls it its largest and most knowledgeable large language model, with more than a tenfold improvement in compute efficiency over GPT-4. However, OpenAI explicitly warns that GPT-4.5 is not a frontier model and will not beat benchmarks; on most readiness evaluations it trails o1, o3-mini, and Deep Research. CEO Sam Altman noted the model is huge and expensive, and rollout is limited by GPU shortages. The model shows gains in conversational naturalness, world knowledge, and reduced hallucination (19% versus 52% for GPT-4o), but lacks new multimodal capabilities. Access begins with ChatGPT Pro subscribers, followed by Plus/Team and Enterprise/Edu users; the API is available on all paid tiers. Pricing is higher due to compute intensity.
OpenAI's largest LLM release has broad implications for AI-driven marketing, content, and advertising tools, although the company explicitly positions it as a non-frontier model with incremental improvements.
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Key Takeaways & Evidence Grounding
- OpenAI released GPT-4.5 as a research preview, succeeding GPT-4o.
- GPT-4.5 is OpenAI's largest LLM, delivering more than a 10x compute efficiency improvement over GPT-4.
- OpenAI says GPT-4.5 introduces no new frontier capabilities and trails o1, o3-mini, and Deep Research on most readiness evaluations.
- GPT-4.5 reduced hallucinations to 19% compared to GPT-4o's 52% (PersonQA accuracy 78% vs 28%).
- Access rolls out first to ChatGPT Pro ($200/month), followed by Plus/Team and Enterprise/Edu users; API available on paid tiers.
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