DeepSeek‑V4 vs GPT‑5.5: First Real‑World Tests Reveal Surprising Results
On the day GPT‑5.5 launched, DeepSeek‑V4 followed, and a series of head‑to‑head tests—including a logic puzzle, an IMO math problem, HTML generation, game‑engine coding, token‑efficiency measurement, and a network‑security challenge—showed GPT‑5.5 generally leading while DeepSeek demonstrated notable strengths and cost advantages.
