GPT-5.5 vs Gemini 3.1 Pro (Preview)
Compare GPT-5.5 vs Gemini 3.1 Pro (Preview) API pricing, token costs, context windows, and latency. See which model is cheaper and better for your stack.
GPT-5.5 charges $5.00/1M input and $30.00/1M output tokens, compared to Gemini 3.1 Pro (Preview) at $2.00/1M input and $12.00/1M output. Gemini 3.1 Pro (Preview) is 2.5x cheaper on input tokens. In reasoning benchmarks, Neither rated holds the higher AA Intelligence Index rating. For latency-critical streaming, GPT-5.5 delivers 79 t/s (39.0s TTFT) while Gemini 3.1 Pro (Preview) provides 124 t/s (15.0s TTFT).
Full Metric & Specification Comparison
| Metric | GPT-5.5 | Gemini 3.1 Pro (Preview) | Advantage |
|---|---|---|---|
| Provider | OpenAI | - | |
| Input Token Cost (1M) | $5.000 | $2.000 | Gemini 3.1 Pro (Preview) |
| Output Token Cost (1M) | $30.000 | $12.000 | Gemini 3.1 Pro (Preview) |
| Context Window | 922k tokens | 1,000k tokens | Gemini 3.1 Pro (Preview) |
| AA Intelligence Index | Unrated | Unrated | Unrated |
| Streaming Latency | Moderate | Fast | - |
Key Architectural Takeaways
- Input Token Cost: GPT-5.5 is $5.00/1M vs Gemini 3.1 Pro (Preview) at $2.00/1M
- Output Token Cost: GPT-5.5 is $30.00/1M vs Gemini 3.1 Pro (Preview) at $12.00/1M
- Context Window: GPT-5.5 supports 922k tokens vs Gemini 3.1 Pro (Preview) with 1,000k tokens
- Benchmark Intelligence Rating: not rated for one or both models
- Inference Latency: GPT-5.5 is rated Moderate vs Gemini 3.1 Pro (Preview) rated Fast
Calculate Your Team's Exact Bill Difference
Drag the sliders below to see real-time cost divergences based on your daily token consumption.
Deploying Gemini 3.1 Pro (Preview) over GPT-5.5 saves $180.00/mo ($2160/yr) at this volume.
Frequently Asked Questions
Is GPT-5.5 cheaper than Gemini 3.1 Pro (Preview)?
Gemini 3.1 Pro (Preview) is significantly more economical, charging $2.00/1M input compared to $5.00/1M for GPT-5.5.
Which model should I choose for production?
If your primary constraint is API cost and high query throughput, choose Gemini 3.1 Pro (Preview). If you require peak reasoning accuracy and complex tool use, Neither rated is recommended.
How does context window compare between GPT-5.5 and Gemini 3.1 Pro (Preview)?
Gemini 3.1 Pro (Preview) offers the larger context window (1,000k tokens), allowing you to pass significantly larger codebases or documents without chunking.
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