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Notes on gotchas while migrating 35kb preprompts from Opus to self-hosted Ollama

The author shares practical lessons learned while migrating 35KB prompts from Anthropic's Opus model to a self-hosted Ollama instance. Key gotchas include differences in prompt formatting, context handling, and output consistency between proprietary and open-source models.

Background

As costs for API-based LLMs rise and privacy concerns grow, more developers are exploring self-hosted alternatives like Ollama. However, migrating complex prompt engineering between different model providers requires navigating subtle behavioral differences.

Source
Hacker News (RSS)
Published
Sep 14, 2026 at 09:59 PM
Score
5.0 / 10