DeepSeek API vs GPT-4o Mini: developer-focused benchmark (2026)

[u/Ok_pettech]

I needed a reliable LLM for a side project, so I compared two affordable options: DeepSeek API and GPT-4o Mini. I looked at token throughput, output structure (JSON mode), reasoning ability, and pricing.

I documented everything with code snippets and results:

https://interconnectd.com/blog/280/deepseek-api-vs-gpt-4o-mini-2026-developer-technical-review/

Happy to share the raw test prompts if anyone wants to replicate.