Best Open Source LLMs to Replace Opus 4.7 or GPT-5.5: Affordable AI Coding Alternatives 2026

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Discover the top 6 open source language models that can replace Claude Opus 4.7 or GPT-5.5 for coding tasks at a fraction of the cost: GLM-5.1, Kimi K2.6, Qwen 3.6 Plus, MiniMax M2.7, MiMo V2.5 Pro, and Mistral Medium 3.5.