Head-to-head
Claude Sonnet 5.5 vs DeepSeek V3 (Thinking)
As of October 25, 2026, Claude Sonnet 5.5 leads DeepSeek V3 (Thinking) on the Analyzer Index, 86.7 to 82.0.
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 Sonnet 5.5
AnthropicDeepSeek V3 (Thinking)
DeepSeek| At a glance | Claude Sonnet 5.5 | DeepSeek V3 (Thinking) |
|---|---|---|
| Analyzer Index | 86.7 (5/13) | 82.0 (4/13) |
| Blended price | $4.00/M | $0.50/M |
| Cheapest host | maker's API | $0.44/M |
| Context | 1.0M | 128k |
| Output speed | 101 tok/s | 25 tok/s |
| Time to first token | 1.06 s | 1.73 s |
| Benchmark | Claude Sonnet 5.5 | DeepSeek V3 (Thinking) |
|---|---|---|
Chatbot Arena Elo Arena | ||
SWE-bench Verified SWE-bench | — | |
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 | — | |
Humanity's Last Exam HLE | — | |
Aider Polyglot Aider | — | |
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.