Benchmark scores
Higher is better for all benchmark scores (SWE-bench, GPQA, HLE, Terminal-Bench, etc.). Green marks the model with the higher score.
LLM Comparison
Claude Sonnet 5.5 vs DeepSeek V4.1 Flash: benchmark scores, pricing & comparison.
Side-by-side Claude Sonnet 5.5 vs DeepSeek V4.1 Flash comparison across SWE-bench, GPQA, HLE, Terminal-Bench, coding agent scores, token pricing, context window, and AskClash RWT. Green marks the winner on each benchmark.
Verdict: Claude Sonnet 5.5 ranks higher (#6 vs #16) and wins 4 of 6 shared benchmarks; DeepSeek V4.1 Flash costs less ($0.15/$0.60 vs $2.00/$10.0 per 1M tokens).
Rank #6 vs #16AskClash overall scores 73.7 vs 65.6.
Pricing $2.00/$10.0 vs $0.15/$0.60Input and output token prices per 1M tokens when published.
Proprietary vs APIAnthropic vs DeepSeek.
Claude Sonnet 5.5 vs DeepSeek V4.1 Flash benchmark comparison
Green cells highlight the winning model for each metric. Scores are cached from the AskClash LLM leaderboard snapshot.
| Metric | Claude Sonnet 5.5 | DeepSeek V4.1 Flash |
|---|---|---|
| Overall Score | 73.7 | 65.6 |
| Leaderboard Rank | #6 | #16 |
| ACB | 76.6 | 63.0 |
| HLE | 64.5 | 36.8 |
| GPQA | — | 90.9 |
| SWE-Pro | 81.3 | — |
| Terminal-Bench | 83.2 | 90.6 |
| DeepSWE | 71.0 | 74.2 |
| GDPval-AA | 1844.2 | 1600.0 |
| Finance Agent | 58.1 | 53.5 |
| MMMU-Pro | — | 77.0 |
| Input Price (per 1M tokens) | $2.00 | $0.15 |
| Output Price (per 1M tokens) | $10.0 | $0.60 |
| Context Window | 1M | 1M |
| Benchmarks Published | 10 | 11 |
Claude Sonnet 5.5 vs DeepSeek V4.1 Flash head-to-head charts
Claude Sonnet 5.5 leads 5 and DeepSeek V4.1 Flash leads 2 of 7 shared benchmarks. DeepSeek V4.1 Flash is cheaper on a defined 1M-input / 200K-output workload. Charts show only benchmarks both models publish.
Claude Sonnet 5.5DeepSeek V4.1 Flash
Overall
ACB
HLE
Terminal-Bench
DeepSWE
GDPval-AA
Finance Agent
Claude Sonnet 5.5
Input$2.00
Output$10.0
Workload$4.00
Context1M
DeepSeek V4.1 Flash
Input$0.15
Output$0.60
Workload$0.27
Context1M
Workload = published cost of 1M input + 200K output tokens. Open the live leaderboard for interactive compare charts.
More Claude Sonnet 5.5 and DeepSeek V4.1 Flash comparisons
Explore how Claude Sonnet 5.5 and DeepSeek V4.1 Flash stack up against other top-ranked LLMs.
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How to read this comparison
Token pricing
Lower is better for input and output prices. Green marks the cheaper model per 1M tokens.
Coverage matters
Models with fewer disclosed benchmark cells may have inflated percentile scores. Check the benchmark cell count for context.
This comparison page is generated from the AskClash LLM leaderboard cache. Open the live leaderboard for real-time scores and interactive filtering.