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GPT-6 Astra Enters a Four-Way Comparison With Kimi K3, Claude Fable 5.1 and GPT-5.6 Sol

  • Foundation Models
  • AI Agents

OpenAI's GPT-6 Astra has entered a four-model frontier comparison with Anthropic's Claude Fable 5.1, Moonshot AI's Kimi K3 and OpenAI's GPT-5.6 Sol. The lineup exposes different trade-offs between autonomous computer use, long-horizon agents, open weights and operating cost.

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