AI Model Guide: Choosing Between Open Source and Closed Models

This guide, the final part of a four-part series, offers a decision tree for selecting the best AI model based on specific use cases in June 2026. It highlights DeepSeek V4 Pro and V4 Flash as the leading open-source options with full weights and MIT licenses, contrasting them with closed models like GPT-5.5, Claude Opus 4.8, and Gemini 3.5 Flash, which are API-only. The guide details model performance across various tasks, including coding, agentic automation, multimodal analysis, design, long document processing, and cost-efficiency, emphasizing that no single model is superior for all applications. AI

IMPACT Provides a framework for selecting AI models based on specific use cases, highlighting trade-offs between open-source and closed systems.

RANK_REASON This is a comparative guide and analysis of existing models, not a release of new models or research.

Read on dev.to — LLM tag →

• Claude Opus 4.7
• Claude Opus 4.8
• DeepSeek V4 Flash
• DeepSeek V4 Pro
• Gemini 3.5 Flash
• GPT-5.5
• MiniMax M3
• MIT License

• model release
• product

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