Claude Opus 4.6 vs GPT-5.1
Detailed comparison between Claude Opus 4.6 and GPT-5.1 for RAG applications. See which LLM best meets your accuracy, performance, and cost needs.
Model Comparison
Claude Opus 4.6 takes the lead.
Both Claude Opus 4.6 and GPT-5.1 are powerful language models designed for RAG applications. However, their performance characteristics differ in important ways.
Why Claude Opus 4.6:
- Claude Opus 4.6 has 64 higher ELO rating
- Claude Opus 4.6 is 4.6s faster on average
- Claude Opus 4.6 has a 9.5% higher win rate
Overview
Key metrics
ELO Rating
Overall ranking quality
Claude Opus 4.6
GPT-5.1
Win Rate
Head-to-head performance
Claude Opus 4.6
GPT-5.1
Quality Score
Overall quality metric
Claude Opus 4.6
GPT-5.1
Average Latency
Response time
Claude Opus 4.6
GPT-5.1
Visual Performance Analysis
Performance
ELO Rating Comparison
Win/Loss/Tie Breakdown
Quality Across Datasets (Overall Score)
Latency Distribution (ms)
Breakdown
How the models stack up
| Metric | Claude Opus 4.6 | GPT-5.1 | Description |
|---|---|---|---|
| Overall Performance | |||
| ELO Rating | 1780 | 1716 | Overall ranking quality based on pairwise comparisons |
| Win Rate | 74.8% | 65.3% | Percentage of comparisons won against other models |
| Quality Score | 4.88 | 4.99 | Average quality across all RAG metrics |
| Pricing & Context | |||
| Input Price per 1M | $5.00 | $1.25 | Cost per million input tokens |
| Output Price per 1M | $25.00 | $10.00 | Cost per million output tokens |
| Context Window | 1000K | 400K | Maximum context window size |
| Release Date | 2026-02-05 | 2025-11-13 | Model release date |
| Performance Metrics | |||
| Avg Latency | 11.5s | 16.2s | Average response time across all datasets |
Dataset Performance
By benchmark
Comprehensive comparison of RAG quality metrics (correctness, faithfulness, grounding, relevance, completeness) and latency for each benchmark dataset.
MSMARCO
| Metric | Claude Opus 4.6 | GPT-5.1 | Description |
|---|---|---|---|
| Quality Metrics | |||
| Correctness | 5.00 | 5.00 | Factual accuracy of responses |
| Faithfulness | 5.00 | 5.00 | Adherence to source material |
| Grounding | 5.00 | 5.00 | Citations and context usage |
| Relevance | 5.00 | 5.00 | Query alignment and focus |
| Completeness | 5.00 | 5.00 | Coverage of all aspects |
| Overall | 5.00 | 5.00 | Average across all metrics |
| Latency Metrics | |||
| Mean | 7669ms | 9111ms | Average response time |
| Min | 3748ms | 3841ms | Fastest response time |
| Max | 12462ms | 34731ms | Slowest response time |
PG
| Metric | Claude Opus 4.6 | GPT-5.1 | Description |
|---|---|---|---|
| Quality Metrics | |||
| Correctness | 5.00 | 5.00 | Factual accuracy of responses |
| Faithfulness | 5.00 | 5.00 | Adherence to source material |
| Grounding | 5.00 | 5.00 | Citations and context usage |
| Relevance | 5.00 | 5.00 | Query alignment and focus |
| Completeness | 5.00 | 4.78 | Coverage of all aspects |
| Overall | 5.00 | 4.96 | Average across all metrics |
| Latency Metrics | |||
| Mean | 16812ms | 29008ms | Average response time |
| Min | 11207ms | 4393ms | Fastest response time |
| Max | 26006ms | 43887ms | Slowest response time |
SciFact
| Metric | Claude Opus 4.6 | GPT-5.1 | Description |
|---|---|---|---|
| Quality Metrics | |||
| Correctness | 4.55 | 5.00 | Factual accuracy of responses |
| Faithfulness | 4.64 | 5.00 | Adherence to source material |
| Grounding | 4.64 | 5.00 | Citations and context usage |
| Relevance | 5.00 | 5.00 | Query alignment and focus |
| Completeness | 4.36 | 5.00 | Coverage of all aspects |
| Overall | 4.64 | 5.00 | Average across all metrics |
| Latency Metrics | |||
| Mean | 10159ms | 10454ms | Average response time |
| Min | 4747ms | 4700ms | Fastest response time |
| Max | 19093ms | 21205ms | Slowest response time |
Explore More
Compare more LLMs
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