Gemini 3.1 Pro vs GPT-5.6 Terra
Gemini 3.1 Pro and GPT-5.6 Terra are both current production-tier models. Gemini 3.1 Pro leads on long-context retrieval, vision.
Specs side by side
| Metric | Google Gemini 3.1 Pro | OpenAI GPT-5.6 Terra |
|---|---|---|
| Input price (per 1M) | $2 | $2.5 |
| Output price (per 1M) | $12 | $15 |
| Context window | 2M tokens | 1.1M tokens |
| Speed tier | balanced | balanced |
| Open weights | No | No |
| EU region | Yes | Yes |
| Free tier | No | No |
| Prompt caching | Yes | Yes |
| Vision input | Yes | Yes |
| Extended thinking | Yes | Yes |
When to choose each
Choose Gemini 3.1 Pro if…
- You need 2M context (2× more than GPT-5.6 Terra)
- Long-context retrieval is central to your workload
- Vision is central to your workload
Choose GPT-5.6 Terra if…
- GPT-5.6 Terra is in the same tier as Gemini 3.1 Pro — pick by provider preference or API ecosystem
Benchmark delta
Gemini 3.1 Pro leads on
- Long-context retrieval
- Vision
GPT-5.6 Terra leads on
GPT-5.6 Terra has no meaningful benchmark lead in this pair.
FAQ — Gemini 3.1 Pro vs GPT-5.6 Terra
Gemini 3.1 Pro vs GPT-5.6 Terra — which is better?
Gemini 3.1 Pro and GPT-5.6 Terra are both current production-tier models. Gemini 3.1 Pro leads on long-context retrieval, vision. The right pick depends on your use case — see "When to choose each" above for a data-driven decision.
How does Gemini 3.1 Pro pricing compare to GPT-5.6 Terra?
Gemini 3.1 Pro costs $2 / $12 per 1M vs GPT-5.6 Terra at $2.5 / $15 per 1M. Gemini 3.1 Pro is cheaper on output tokens by roughly 25%. Both support prompt caching, which reduces effective cost by 80-90% on repeat system prompts.
Does Gemini 3.1 Pro or GPT-5.6 Terra have the bigger context window?
Gemini 3.1 Pro has a 2M-token context window — 2× the 1.1M context of GPT-5.6 Terra. Enough for entire codebases, books, or multi-document RAG.
Is there a free tier for Gemini 3.1 Pro or GPT-5.6 Terra?
Gemini 3.1 Pro: no — Paid-only since 2026-04-01 (previously had free tier via AI Studio). GPT-5.6 Terra: no — Free $5 credit for new accounts; paid thereafter.
Which is better for coding — Gemini 3.1 Pro or GPT-5.6 Terra?
Gemini 3.1 Pro leads on coding benchmarks (Gemini 3.1 Pro: 94/100, GPT-5.6 Terra: 93/100). For production coding agents also weigh tool-use performance — Gemini 3.1 Pro scores 91, GPT-5.6 Terra scores 93.