Updated: October 2026
The id8 Best LLM for Interview Prep guide ranks 164 models. Interview prep needs strong coding, technical reasoning, and conversational quality for mock interviews. Right now DeepSeek V4-Pro, Claude Opus 5 and Gemini 3.8 Flash lead (graded on LiveCodeBench, GPQA Diamond and Arena Elo (Text) plus an overall task grade). Best budget pick graded A or better: Qwen3.7 Flash ($0.03/$0.13 per 1M tokens). Prices and scores are re-checked daily.
Right now DeepSeek V4-Pro, Claude Opus 5 and Gemini 3.8 Flash lead (graded on LiveCodeBench, GPQA Diamond and Arena Elo (Text) plus an overall task grade). Best budget pick graded A or better: Qwen3.7 Flash ($0.03/$0.13 per 1M tokens).
Tell the model the role and level, then ask it to put one question at a time, wait for your answer, and give feedback before moving on. Without that instruction most models print a list of questions and answers.
The top open-weight models for interview prep right now are DeepSeek V4-Pro, Kimi K3 and GLM-5.1. They can run locally, so your practice code stays on your machine.
Read the company's policy. Many treat undeclared LLM use in an assessment as cheating. For practice, use it freely.
System design needs strong reasoning and clear explanation, so the top models for reasoning do well here too: DeepSeek V4-Pro, Claude Opus 5 and Gemini 3.8 Flash. Ask the model to challenge your trade-offs, not to produce a finished design.
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