AI Prompt Trends Today — October 28, 2026

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🔥 Hot Prompt Techniques Today

• Unified Custom Instructions (Un-buddy Prompt): A prompt designed to control major AI models like ChatGPT, Claude, and Gemini from being overly friendly or engaging in unnecessary social behaviors with users. After testing a single custom instruction applicable to all three models, it was confirmed that the AI's responses become more direct and professional in tone.

• Android Coding-Specialized Prompt: As the Gemini 4 Argon model was evaluated as falling behind Claude and GPT-6 in Android coding benchmarks, the importance of writing prompts that consider the model's strengths when developing for specific platforms (Android) is being emphasized. Prompt optimization considering differences in coding styles per model is necessary.

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💡 Popular Tips Shared by the Community

• Re-evaluation of Prompt Engineering: Contrary to claims that "prompts are dead," active discussions are taking place as the instruction-following capabilities of 2026 models have improved, making prompt engineering important once again at the 2023-2024 level. In particular, the latest GitHub repositories tailored for Codex/GPT 2026 versions are being revisited.

• Censorship Bypass and Ethics Code Removal Guide: A guide on prompt techniques to bypass censorship and remove ethics codes in ChatGPT for AI safety testing and academic research purposes was updated two weeks ago. This can be used as a reference for designing prompts for legitimate research and testing purposes.

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🚀 AI Model New Features & Updates

• Impact of GPT-6 Astra on the Korean Market: Following the launch of OpenAI's GPT-6 Astra model, ChatGPT is rapidly closing in on Claude in the Korean generative AI market. Showing a strong rebound since its September launch, it is also bringing changes to the model selection criteria of domestic companies.

• Swedish Government Bans AI Tools: Citing data security concerns, the Swedish government banned the browser-based use of ChatGPT and Claude within government agencies starting October 26. Instead, Microsoft Copilot remains an approved tool. This suggests that businesses and public institutions need to re-examine their data security regulations when adopting AI.

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📚 Prompt Writing Guides & Resources

• Official 2026 Prompt Engineering Guide: A practical guide comparing and organizing official developer documents from OpenAI, Anthropic, and Google is drawing attention. It is useful for understanding differences in recommended prompt writing methods from each company as of October 2026 and writing prompts tailored to each model's characteristics.

• Building a Prompt Library for Teams: A guide on building reusable AI templates and establishing a governance framework has been updated. It suggests ways to maintain consistent prompt quality within the team using an 8-field template and reduce the learning curve for new hires.

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🎯 Trends to Watch

• Tightening AI Data Security Regulations: Following Sweden's example, major countries and companies are strengthening security regulations on the use of AI models. As a result, a trend is spreading where companies independently manage a list of approved AI tools and process sensitive data only in local models or approved cloud environments.

• Experiencing Performance Gaps by Model: As seen in the Android coding benchmark results of Gemini 4 Argon, performance differences among models are becoming clear depending on specific tasks (coding, logical reasoning, creative writing, etc.). A "multi-model strategy" that selects the optimal model for each task, moving away from single-model dependence, is emerging as the core of prompt tips.

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