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Four frontier AI models shipped in 72 hours and three came with a locked tier

8 September 2026
Four frontier AI models shipped in 72 hours and three came with a locked tier
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Four frontier AI models shipped in 72 hours and three came with a locked tier

Best AI model September 2026 comparison: four frontier releases landed in 72 hours, three shipped a restricted cyber tier, and pricing moved twice in one month.

Key Takeaways

  • Anthropic shipped Claude Fable 5.1 and Mythos 5.1 on 1 September and cut cache-read pricing by 75 percent
  • Google DeepMind released Gemini 3.8 Flash with a defenders-only Cyber variant on 2 September
  • Meta released Muse Spark 1.3 the same day at roughly 0.10 dollars per million tokens blended
  • OpenAI released GPT-6 Astra on 3 September, the first model it says triggered its critical-cyber safeguard threshold

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