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Claude Opus 5, GPT-5.6 Sol, and Kimi K3 Compared Across Key AI Benchmarks

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Three major AI labs released flagship models within 15 days of each other in July 2025: OpenAI's GPT-5.6 Sol on July 9, Moonshot's Kimi K3 on July 16, and Anthropic's Claude Opus 5 on July 24. Claude Opus 5 leads on coding and reasoning benchmarks, scoring 79.2 percent on SWE-bench Pro compared to GPT-5.6 Sol's 64.6 percent, and 30.2 versus 7.8 on ARC-AGI-3. GPT-5.6 Sol holds the top spot on Terminal-Bench 2.1 with 91.9 percent and also leads on DeepSWE 1.1 and HealthBench Professional. Kimi K3 is a mixture-of-experts open-weight model with 2.8 trillion total parameters, though only a fraction activate per token, enabling competitive pricing at roughly 40 percent below Opus 5 on input costs. Across all three models, context windows and output limits have largely converged, shifting competitive differentiation toward real-world performance under complex, multi-step workloads.

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Claude Opus 5, GPT-5.6 Sol, and Kimi K3 Compared Across Key AI Benchmarks · ShortSingh