June 2026 Becomes the Biggest AI Model Launch Month Ever — Four Frontier Releases in 30 Days

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Four frontier launches in 30 days (Gemini 3.5 Pro, Grok 5, Anthropic's Fable 5/Mythos 5, plus open-weight GLM-5.2 and Kimi K2.7) compressed the model-layer competitive moat to weeks rather than quarters. The builder takeaway: switching costs between top models have effectively collapsed to near zero, raising the strategic risk of building deep coupling to any single model provider.