Anthropic's Opus 5.5 Challenges OpenAI's GPT-6 Astra with Speed and Cost Advantage
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Anthropic has released Claude Opus 5.5, a model that matches GPT-6 Astra's performance on many benchmarks while undercutting it on speed and price. The two frontier models—released within three weeks of each other in September 2026—now form the center of the AI market's latest competitive split, with each company optimizing for different strengths.
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