Gemini 3 Pro Preview vs GPT 5.1
Gemini 3 Pro Preview vs GPT 5.1: GPT 5.1 is cheaper by 20%. Gemini 3 Pro Preview from Google Vertex AI (1,048,576-token context) vs. GPT 5.1 from Azure OpenAI (272,000-token context). Use Agent Command Center to A/B both in shadow mode and pick the winner per workload.
Side-by-side cost
Live workload comparison
Same workload run through both models. The cheaper one is highlighted.
3,000
01,048,576
400
0128,000
5,000
01,000,000
At this workload, GPT 5.1 is 28% cheaper than Gemini 3 Pro Preview — a savings of $464/month ($5,570/year).
Production recipe — Agent Command Center
strategy: cost-optimized
primary:
model: gpt-5-1
provider: azure-openai
fallback:
model: gemini-3-pro-preview
provider: vertex-ai
shadow: { sample_rate: 0.05 } # mirror 5% of traffic to compare quality live| Gemini 3 Pro Preview | GPT 5.1 | |
|---|---|---|
| Input price | $2.00/M | $1.25/M |
| Output price | $12.00/M | $10.00/M |
| Context window | 1,048,576 | 272,000 |
| Max output | 65,535 | 128,000 |
| Function calling | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio input | ✓ | — |
| Reasoning | ✓ | ✓ |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Pricing verified | May 16, 2026 | May 16, 2026 |
Benchmark comparison
Side-by-side public benchmark scores. Greener bar = winner.
Chatbot Arena ELOgeneral
Gemini 3 Pro Preview
1,486
GPT 5.1
1,455