Gemini 3.1 Pro vs GPT Realtime 2
Gemini 3.1 Pro and GPT Realtime 2 are both current production-tier models. Gemini 3.1 Pro is meaningfully cheaper at $2 / $12 per 1M. Gemini 3.1 Pro has a 2M context window — about 16× the 128k of GPT Realtime 2. Gemini 3.1 Pro leads on coding, reasoning, general knowledge.
Specs side by side
| Metric | Google Gemini 3.1 Pro | OpenAI GPT Realtime 2 |
|---|---|---|
| Input price (per 1M) | $2 | $4 |
| Output price (per 1M) | $12 | $24 |
| Context window | 2M tokens | 128k tokens |
| Speed tier | balanced | ultra |
| Open weights | No | No |
| EU region | Yes | Yes |
| Free tier | No | No |
| Prompt caching | Yes | No |
| Vision input | Yes | No |
| Extended thinking | Yes | No |
When to choose each
Choose Gemini 3.1 Pro if…
- Cost is a priority ($2 / $12 per 1M vs $4 / $24 per 1M)
- You need 2M context (16× more than GPT Realtime 2)
- HIPAA eligibility is required
- You need image input / vision
- Coding is central to your workload
- Reasoning is central to your workload
Choose GPT Realtime 2 if…
- Low latency matters (ultra vs balanced)
- You need realtime speech-to-speech
Benchmark delta
Gemini 3.1 Pro leads on
- Coding
- Reasoning
- General knowledge
- Long-context retrieval
- Instruction following
- Multilingual
- Tool use
GPT Realtime 2 leads on
GPT Realtime 2 has no meaningful benchmark lead in this pair.
FAQ — Gemini 3.1 Pro vs GPT Realtime 2
Gemini 3.1 Pro vs GPT Realtime 2 — which is better?
Gemini 3.1 Pro and GPT Realtime 2 are both current production-tier models. Gemini 3.1 Pro is meaningfully cheaper at $2 / $12 per 1M. Gemini 3.1 Pro has a 2M context window — about 16× the 128k of GPT Realtime 2. Gemini 3.1 Pro leads on coding, reasoning, general knowledge. 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 Realtime 2?
Gemini 3.1 Pro costs $2 / $12 per 1M vs GPT Realtime 2 at $4 / $24 per 1M. Gemini 3.1 Pro is cheaper on output tokens by roughly 100%. Both support prompt caching, which reduces effective cost by 80-90% on repeat system prompts.
Does Gemini 3.1 Pro or GPT Realtime 2 have the bigger context window?
Gemini 3.1 Pro has a 2M-token context window — 16× the 128k context of GPT Realtime 2. Enough for entire codebases, books, or multi-document RAG.
Is there a free tier for Gemini 3.1 Pro or GPT Realtime 2?
Gemini 3.1 Pro: no — Paid-only since 2026-04-01 (previously had free tier via AI Studio). GPT Realtime 2: no — Paid-only.
Which is better for coding — Gemini 3.1 Pro or GPT Realtime 2?
Gemini 3.1 Pro leads on coding benchmarks (Gemini 3.1 Pro: 94/100, GPT Realtime 2: 78/100). For production coding agents also weigh tool-use performance — Gemini 3.1 Pro scores 91, GPT Realtime 2 scores 84.