Head-to-head
Claude Opus 5 vs DeepSeek V4.1 Flash
As of October 26, 2026, Claude Opus 5 leads DeepSeek V4.1 Flash on the Analyzer Index, 90.7 to 81.5.
Normalized scores are min-maxed per benchmark across all models we track (0–100). Open the interactive compare view to add benchmarks to the radar chart or pull in more models.
Claude Opus 5
AnthropicDeepSeek V4.1 Flash
DeepSeek| At a glance | Claude Opus 5 | DeepSeek V4.1 Flash |
|---|---|---|
| Analyzer Index | 90.7 (6/13) | 81.5 (6/13) |
| Blended price | $10.00/M | $0.27/M |
| Cheapest host | maker's API | $0.11/M |
| Context | 1.0M | 1.0M |
| Output speed | 85 tok/s | 137 tok/s |
| Time to first token | 3.40 s | 1.04 s |
| Benchmark | Claude Opus 5 | DeepSeek V4.1 Flash |
|---|---|---|
Chatbot Arena Elo Arena | ||
Output Speed Speed | ||
Time to First Token TTFT | ||
Rolling Contamination-Controlled Average Rolling Avg | ||
Rolling Data Analysis Data Analysis | ||
SimpleQA Verified SimpleQA | ||
OTIS Mock AIME 2024-2025 OTIS AIME | ||
ARC-AGI 2 ARC-AGI 2 | ||
Frontier Composite Frontier | ||
Output Stability Stability | — | |
Format Adherence Format | — | |
Recovery Rate Recovery | — | |
API Success Rate API OK | ||
Safety Handling Safety | — |
Methodology matches the main AI Model Analyzer About page.