GPT-5 (low) vs GPT-5.1 (high)
Comparing 2 AI models · 6 benchmarks · OpenAI
Most Affordable
Op
GPT-5 (low)
$1.25/1M
Highest Intelligence
Op
GPT-5.1 (high)
87.3% GPQA
Best for Coding
Op
GPT-5.1 (high)
57.5 Coding Index
Price Difference
1.0x
input cost range
Composite Indices
Intelligence, Coding, Math
Standard Benchmarks
Academic and industry benchmarks
Benchmark Winners
6 tests
Op
GPT-5 (low)
1
- MATH 500
Op
GPT-5.1 (high)
5
- GPQA
- MMLU Pro
- HLE
- LiveCodeBench
- AIME 2025
| Metric | Op GPT-5 (low) | Op GPT-5.1 (high) |
|---|---|---|
| Pricing Per 1M tokens | ||
| Input Cost | $1.25/1M | $1.25/1M |
| Output Cost | $10.00/1M | $10.00/1M |
| Blended Cost 3:1 input/output ratio | $3.44/1M | $3.44/1M |
| Specifications | ||
| Organization Model creator | OpenAI | OpenAI |
| Release Date Launch date | Aug 7, 2025 | Nov 13, 2025 |
| Performance & Speed | ||
| Throughput Output speed | 100.4 tok/s | 273.7 tok/s |
| Time to First Token (TTFT) Initial response delay | 24992ms | 8572ms |
| Latency Time to first answer token | 24992ms | 8572ms |
| Composite Indices | ||
| Intelligence Index Overall reasoning capability | 61.8 | 69.7 |
| Coding Index Programming ability | 46.8 | 57.5 |
| Math Index Mathematical reasoning | 83.0 | 94.0 |
| Standard Benchmarks | ||
| GPQA Graduate-level reasoning | 80.8% | 87.3% |
| MMLU Pro Advanced knowledge | 86.0% | 87.0% |
| HLE Hard language evaluation | 18.4% | 26.5% |
| LiveCodeBench Real-world coding tasks | 76.3% | 86.8% |
| MATH 500 Mathematical problems | 98.7% | — |
| AIME 2025 Advanced math competition | 83.0% | 94.0% |
| AIME (Original) Math olympiad problems | 83.0% | — |
| SciCode Scientific code generation | 39.1% | 43.3% |
| LCR Code review capability | 58.7% | 75.0% |
| IFBench Instruction-following | 66.6% | 72.9% |
| TAU-bench v2 Tool use & agentic tasks | 84.2% | 81.9% |
| TerminalBench Hard CLI command generation | 24.8% | 42.6% |
Key Takeaways
GPT-5 (low) offers the best value at $1.25/1M, making it ideal for high-volume applications and cost-conscious projects.
GPT-5.1 (high) leads in reasoning capabilities with a 87.3% GPQA score, excelling at complex analytical tasks and problem-solving.
GPT-5.1 (high) achieves a 57.5 coding index, making it the top choice for software development and code generation tasks.
All models support context windows of ∞+ tokens, suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
Op
GPT-5 (low)
- Cost-sensitive applications