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Your Agent Didn't Fail at the Tool Call. It Failed at the Plan.
Sun et al. (2026) introduce Agent Planning Benchmark: 4,209 multimodal cases across 12 models. GPT-5 holistic plan correctness is 74.5% vs GPT-4o's 19.5%. Extra tools drop GPT-5 to 67.0% and spike tool-use errors from 2.3% to 15.8%. Constraint violation remains 16%+ even at the frontier.
Known but Not Cited: Why AI Share of Voice Is the Wrong GEO Metric
Similarweb's June 2026 analysis of ~600,000 US citation events separates AI share of voice (recognition) from AI citation share (trust). ChatGPT cites Wikipedia and Reddit; Google AI Mode leads with Fandom, then Wikipedia, then YouTube. Sephora's ~16% citation share landed only on purchase-intent prompts.
Context Rot: Why Longer Context Windows Don't Mean Better Agents
Chroma showed that even simple tasks degrade as input length grows. Xia et al. (2026) then showed the operational failure in long-horizon search agents: premature termination — models give up or emit uncertain incorrect answers long before they exhaust the context window.
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Michael Horn
Michael Horn is the Global Head of AI at Omnicom Advertising, driving responsible AI transformation and inclusive brand experiences for Fortune 100 clients worldwide.
Daniel Hulme
Dr. Daniel Hulme is the Global Chief AI Officer at WPP, CEO of Satalia and Conscium, and a world-renowned AI expert, investor, and keynote speaker.
Garrett Sussman
Garrett Sussman is Director of Marketing at iPullRank and a leading voice in SEO, AI Search, and content marketing with over 15 years of industry experience.