Updated March 26, 2026· Based on independent benchmark data
GPT-5.1 (high) and Gemini 3 Flash Preview (Reasoning) are virtually tied on intelligence (47.7 vs 46.4). Gemini 3 Flash Preview (Reasoning) is 2.5x cheaper at $0.50/1M tokens vs $1.25/1M. For speed, Gemini 3 Flash Preview (Reasoning) wins at 192 tok/s vs 92 tok/s.
| Metric | GPT-5.1 (high) | Gemini 3 Flash Preview (Reasoning) |
|---|---|---|
| Intelligence Score | 47.7 | 46.4 |
| Coding Score | 44.7 | 42.6 |
| Math Score | 94.0 | 97.0 |
| Speed (tok/s) | 92 tok/s | 192 tok/s |
| Latency (TTFT) | 39.04s | 6.11s |
| Input Price / 1M tokens | $1.25 | $0.50 |
| Output Price / 1M tokens | $10 | $3.00 |
| Context Window |
GPT-5.1 (high) and Gemini 3 Flash Preview (Reasoning) perform similarly on overall intelligence, scoring 47.7 and 46.4 respectively. For coding tasks, GPT-5.1 (high) has the edge with a coding score of 44.7 vs 42.6. In mathematical reasoning, Gemini 3 Flash Preview (Reasoning) leads with 97.0 compared to GPT-5.1 (high)'s 94.0.
Gemini 3 Flash Preview (Reasoning) generates output significantly faster at 192 tok/s compared to GPT-5.1 (high)'s 92 tok/s, making it 2.1x faster for streaming responses. Time to first token is 6.11s for Gemini 3 Flash Preview (Reasoning) vs 39.04s for GPT-5.1 (high), which affects perceived responsiveness in interactive applications.
Gemini 3 Flash Preview (Reasoning) is more affordable at $0.50/1M input tokens ($3.00/1M output), while GPT-5.1 (high) costs $1.25/1M input ($10/1M output). That makes GPT-5.1 (high) 2.5x more expensive per token, which can add up significantly at scale. For a typical workload of 100 requests per day at 2,000 tokens each, GPT-5.1 (high) would cost approximately $7.50/month vs $3.00/month for Gemini 3 Flash Preview (Reasoning) in input costs alone.
Choose GPT-5.1 (high) when you need stronger coding performance (44.7). Choose Gemini 3 Flash Preview (Reasoning) when you need faster output (192 tok/s), lower cost.
GPT-5.1 (high) scores higher on coding benchmarks (44.7 vs 42.6), making it the better choice for programming tasks.
Gemini 3 Flash Preview (Reasoning) is cheaper at $0.50/1M input tokens vs $1.25/1M for GPT-5.1 (high).
Gemini 3 Flash Preview (Reasoning) is faster, producing output at 192 tok/s compared to GPT-5.1 (high)'s 92 tok/s.
No, GPT-5.1 (high) does not support image input. Neither model supports image input.
Data last synced: March 26, 2026
| N/A |
| N/A |
| Max Output Tokens | N/A | N/A |
| Input Modalities | Text | Text |
| Output Modalities | Text | Text |
| Free Tier | No | No |
Both models perform similarly on intelligence benchmarks. Choose based on specific needs: pricing, speed, context window, or provider ecosystem.