Claude Opus 5 Nearly Matches Fable 5 at Half the Price, 50 Companies Defend Open Source AI
Today we're covering the biggest AI stories of July 27th, 2026. Anthropic released Claude Opus 5, calling it a thoughtful and proactive model that outperforms both Fable 5 and GPT-5.6 Sol on agentic coding, knowledge work, and computer use, hitting 30.2% on ARC-AGI-3, three times the next best model, and scoring 42 out of 42 on International Math Olympiad problems, all while pricing at half of Fable 5's rate. Nvidia, Microsoft, Meta, and 47 other companies signed an open letter urging Washington not to restrict open weight AI models, arguing they expand access, keep competition alive, and…
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