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
GPT-5.5 vs DeepSeek V4.1 Flash: benchmark scores, pricing & comparison.
Side-by-side GPT-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.
Rank #11 vs #22AskClash overall scores 64.9 vs 61.7.
Pricing $5.00/$30.0 vs $0.15/$0.60Input and output token prices per 1M tokens when published.
Proprietary vs APIOpenAI vs DeepSeek.
GPT-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 | GPT-5.5 | DeepSeek V4.1 Flash |
|---|---|---|
| Overall Score | 64.9 | 61.7 |
| Leaderboard Rank | #11 | #22 |
| ACB | 62.0 | — |
| RWT | 8.0 | — |
| HLE | 52.2 | 36.8 |
| GPQA | 93.6 | 90.9 |
| IFEval | 75.9 | — |
| SWE-Pro | 58.6 | — |
| Terminal-Bench | 82.7 | 90.6 |
| DeepSWE | 67.0 | 74.2 |
| GDPval-AA | 1395.8 | — |
| OSWorld | 78.7 | — |
| MCP Atlas | 75.3 | — |
| Finance Agent | 51.8 | — |
| MMMU-Pro | 81.2 | — |
| ARC-AGI 2 | 85.0 | — |
| Tau2 | 98.0 | — |
| Input Price (per 1M tokens) | $5.00 | $0.15 |
| Output Price (per 1M tokens) | $30.0 | $0.60 |
| Context Window | 1M | 1M |
| Benchmarks Published | 15 | 4 |
GPT-5.5 vs DeepSeek V4.1 Flash head-to-head charts
GPT-5.5 leads 3 and DeepSeek V4.1 Flash leads 2 of 5 shared benchmarks. DeepSeek V4.1 Flash is cheaper on a defined 1M-input / 200K-output workload. Charts show only benchmarks both models publish.
GPT-5.5DeepSeek V4.1 Flash
Overall
HLE
GPQA
Terminal-Bench
DeepSWE
GPT-5.5
Input$5.00
Output$30.0
Workload$11
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.
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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.