GPT-5.5 vs Gemini 3.1 Pro (Preview)

Price & specs

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

When to pick each

GPT-5.5

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

Gemini 3.1 Pro (Preview)

Best for fast, low-cost inference at scale. Context up to 1M tokens. Gemini 3.1 Pro (Preview) details →

Test both with one change

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

for model in ["gpt-5.5", "gemini-3.1-pro-preview"]:
    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