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September 28–October 4, 2026
Sonnet 5.5 and Sol Land, Worlds Follow
Anthropic shipped Claude Sonnet 5.5, OpenAI followed with GPT-6.1 Sol, and Google DeepMind's Gemini 4 Argon arrived by week's end.
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Model drop
Claude Sonnet 5.5 is here
30%+ faster Sonnet for everyday coding and scoped agent tasks at the same $2/$10 rate
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Also this period
GPT-6.1 SolNear-Astra agentic coding and computer-use performance at roughly one-fifth the price of Astra with 95% cache discountGemini 4 Argon1M-token output runs for unbroken long-horizon coding, knowledge work and cyber defense agentsEleven v4 Turbo~100-150ms latency expressive TTS variant built for real-time agents and conversational voice
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