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 Opus 5.5 vs DeepSeek V4.1 Flash 1017: benchmark scores, pricing & comparison.
Side-by-side Claude Opus 5.5 vs DeepSeek V4.1 Flash 1017 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 Opus 5.5 ranks higher (#1 vs #23) and wins 4 of 4 shared benchmarks; DeepSeek V4.1 Flash 1017 costs less ($0.30/$1.20 vs $4.00/$20.0 per 1M tokens).
Rank #1 vs #23AskClash overall scores 80.0 vs 58.3.
Pricing $4.00/$20.0 vs $0.30/$1.20Input and output token prices per 1M tokens when published.
Proprietary vs Open WeightAnthropic vs DeepSeek.
Claude Opus 5.5 vs DeepSeek V4.1 Flash 1017 benchmark comparison
Green cells highlight the winning model for each metric. Scores are cached from the AskClash LLM leaderboard snapshot.
| Metric | Claude Opus 5.5 | DeepSeek V4.1 Flash 1017 |
|---|---|---|
| Overall Score | 80.0 | 58.3 |
| Leaderboard Rank | #1 | #23 |
| ACB | 76.5 | — |
| HLE | 67.7 | 42.6 |
| GPQA | — | 90.9 |
| SWE-Pro | 89.9 | — |
| Terminal-Bench | 59.6 | — |
| DeepSWE | 74.2 | — |
| GDPval-AA | 1846.2 | 1745.8 |
| Finance Agent | 58.6 | 53.5 |
| MMMU-Pro | 87.7 | 80.6 |
| ARC-AGI 2 | 91.7 | — |
| Input Price (per 1M tokens) | $4.00 | $0.30 |
| Output Price (per 1M tokens) | $20.0 | $1.20 |
| Context Window | 1M | 1M |
| Benchmarks Published | 12 | 8 |
Claude Opus 5.5 vs DeepSeek V4.1 Flash 1017 head-to-head charts
Claude Opus 5.5 leads 5 and DeepSeek V4.1 Flash 1017 leads 0 of 5 shared benchmarks. DeepSeek V4.1 Flash 1017 is cheaper on a defined 1M-input / 200K-output workload. Charts show only benchmarks both models publish.
Claude Opus 5.5DeepSeek V4.1 Flash 1017
Overall
HLE
GDPval-AA
Finance Agent
MMMU-Pro
Claude Opus 5.5
Input$4.00
Output$20.0
Workload$8.00
Context1M
DeepSeek V4.1 Flash 1017
Input$0.30
Output$1.20
Workload$0.54
Context1M
Workload = published cost of 1M input + 200K output tokens. Open the live leaderboard for interactive compare charts.
More Claude Opus 5.5 and DeepSeek V4.1 Flash 1017 comparisons
Explore how Claude Opus 5.5 and DeepSeek V4.1 Flash 1017 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.