DeepSeek V4 Pro vs GPT-5.5

Price & specs

Per 1M tokens, base rates from your credit balance — no usage markup. Prices load live from our catalogue.

When to pick each

DeepSeek V4 Pro

Best for the hardest reasoning, agentic and coding tasks. Context up to 1M tokens. DeepSeek V4 Pro details →

GPT-5.5

Best for the hardest reasoning, agentic and coding tasks. Context up to 1M tokens. GPT-5.5 details →

Test both with one change

Because Zylo is OpenAI-compatible, comparing them is a one-string change.

for model in ["deepseek-v4-pro", "gpt-5.5"]:
    r = client.chat.completions.create(
        model=model,
        messages=[{"role": "user", "content": "Summarize this in one line."}],
    )
    print(model, "->", r.choices[0].message.content)

Frequently asked questions