1. Cost advantage
DeepSeek’s API is repeatedly highlighted as far cheaper than competing frontier models, especially when cache‑read discounts are considered.
"The typical split is 750 in, 290 out, 82k cached. Cost per request for V4 Pro: $0.000875 per request. Equivalent Opus cost (without cache‑write costs): $0.052 per request." — xynelius
2. Performance & benchmark perception
Many users note that the Flash variant trades a small benchmark dip for speed and practical coding competence.
"Flash makes a lot more initial mistakes, and then has to re‑check stuff, producing much more output... eventually gets to the right answer." — pixelesque
"Around 5 percentage points better. (e.g., 87 % instead of 82 %)." — k__
3. Privacy & political risk
Concerns about data handling and geopolitical exposure are a recurring theme, with several users emphasizing the danger of sending prompts to a Chinese‑based service.
"Their privacy policy is unusually bad – they can train off your prompts and completions." — eli
4. Harness & workflow dependence
The consensus is that how a model is wrapped in a tool‑calling harness often matters more than raw model scores.
"The harness has almost equal, if not more weight than the model itself." — KronisLV