ReviewNovember 26, 2025
GPT-5.1 Performance Review: Complete Benchmark Analysis (November 2025)
Comprehensive review of GPT-5.1 performance across all major benchmarks. SWE-bench, AIME 2025, adaptive reasoning analysis, and comparison with competitors.
GPT-5.1 Performance Review
OpenAI released GPT-5.1 on November 13, 2025. Here's our comprehensive benchmark analysis.
Benchmark Results
Coding Performance
- SWE-bench Verified: 76.3% (up from 74.2%)
- HumanEval: 98.1%
- MBPP: 96.4%
Reasoning Performance
- AIME 2025: 94.0% (top 0.1% human performance)
- GPQA Diamond: 81.9%
- MMLU: 92.4%
Key Innovation: Adaptive Reasoning
GPT-5.1 introduces adaptive reasoning with dynamic thinking time:
- Automatically adjusts computation for task complexity
- 30% better token efficiency
- Maintains quality while reducing costs
Speed Improvements
| Metric | GPT-5.0 | GPT-5.1 | Improvement |
| TTFT | 2.4s | 1.8s | 25% faster |
| Tokens/sec | ~55 | ~70 | 27% faster |
Pricing
| Tier | Input ($/M) | Output ($/M) |
| GPT-5.1 | $2.50 | $10 |
| GPT-5.1 Mini | $0.50 | $2 |
Competitive Position
vs Claude 4.5
- SWE-bench: GPT 76.3% vs Claude 77.2% (-0.9)
- Speed: GPT wins significantly
- Cost: GPT wins significantly
vs Gemini 3
- General: Competitive
- Multimodal: Gemini leads
- Coding: GPT leads
Strengths
1. Speed Leader: Fastest frontier model
2. Value: Best price-performance ratio
3. Versatility: Strong across all tasks
4. Ecosystem: Extensive integrations
Weaknesses
1. Coding: Still behind Claude
2. Hallucinations: Occasional issues
3. Context: Smaller than Gemini (256K)
Developer Experience
- Excellent documentation
- Stable API
- Generous rate limits
- Strong SDK support
Recommendation
Best For:- Rapid prototyping
- Customer-facing applications
- Cost-conscious projects
- General-purpose AI tasks
- Mission-critical code (Claude)
- Multimodal (Gemini)
- Maximum context (Gemini)
Final Score: 8.8/10
GPT-5.1 delivers excellent value with competitive performance. Speed and pricing advantages make it attractive for many use cases.