Updated March 25, 2026· Based on independent benchmark data
OpenAI: GPT-5 and Google: Gemini 3.1 Pro Preview Custom Tools are virtually tied on intelligence (57.2 vs 57.2). OpenAI: GPT-5 is 1.6x cheaper at $1.25/1M tokens vs $2.00/1M. For speed, Google: Gemini 3.1 Pro Preview Custom Tools wins at 113 tok/s vs 77 tok/s.
| Metric | OpenAI: GPT-5 | Google: Gemini 3.1 Pro Preview Custom Tools |
|---|---|---|
| Intelligence Score | 57.2 | 57.2 |
| Coding Score | 57.3 | 55.5 |
| Math Score | N/A | N/A |
| Speed (tok/s) | 77 tok/s | 113 tok/s |
| Latency (TTFT) | 147.35s | 23.00s |
| Input Price / 1M tokens | $1.25 | $2.00 |
| Output Price / 1M tokens | $10 | $12 |
| Context Window | 400K |
OpenAI: GPT-5 and Google: Gemini 3.1 Pro Preview Custom Tools perform similarly on overall intelligence, scoring 57.2 and 57.2 respectively. Their coding capabilities are closely matched (57.3 vs 55.5).
Google: Gemini 3.1 Pro Preview Custom Tools generates output significantly faster at 113 tok/s compared to OpenAI: GPT-5's 77 tok/s, making it 1.5x faster for streaming responses. Time to first token is 23.00s for Google: Gemini 3.1 Pro Preview Custom Tools vs 147.35s for OpenAI: GPT-5, which affects perceived responsiveness in interactive applications.
OpenAI: GPT-5 is more affordable at $1.25/1M input tokens ($10/1M output), while Google: Gemini 3.1 Pro Preview Custom Tools costs $2.00/1M input ($12/1M output). For a typical workload of 100 requests per day at 2,000 tokens each, OpenAI: GPT-5 would cost approximately $7.50/month vs $12.00/month for Google: Gemini 3.1 Pro Preview Custom Tools in input costs alone.
Google: Gemini 3.1 Pro Preview Custom Tools offers a larger context window at 1.0M tokens compared to OpenAI: GPT-5's 400K. This means Google: Gemini 3.1 Pro Preview Custom Tools can process roughly 524 pages of text in a single request vs 200 pages for OpenAI: GPT-5. For output length, OpenAI: GPT-5 can generate up to 128K tokens per response vs 66K for Google: Gemini 3.1 Pro Preview Custom Tools.
Choose OpenAI: GPT-5 when you need lower cost. Choose Google: Gemini 3.1 Pro Preview Custom Tools when you need faster output (113 tok/s), larger context window (1.0M).
OpenAI: GPT-5 scores higher on coding benchmarks (57.3 vs 55.5), making it the better choice for programming tasks.
OpenAI: GPT-5 is cheaper at $1.25/1M input tokens vs $2.00/1M for Google: Gemini 3.1 Pro Preview Custom Tools.
Google: Gemini 3.1 Pro Preview Custom Tools is faster, producing output at 113 tok/s compared to OpenAI: GPT-5's 77 tok/s.
Yes, OpenAI: GPT-5 supports image input. Google: Gemini 3.1 Pro Preview Custom Tools also supports images.
Benchmark data by Artificial Analysis
Data last synced: March 25, 2026
| 1.0M |
| Max Output Tokens | 128K | 66K |
| Input Modalities | Text + Image + File | Text + Audio + Image + Video + File |
| Output Modalities | Text | Text |
| Free Tier | No | No |
Google: Gemini 3.1 Pro Preview Custom Tools has a larger context window at 1.0M compared to OpenAI: GPT-5's 400K.
Both models perform similarly on intelligence benchmarks. Choose based on specific needs: pricing, speed, context window, or provider ecosystem.