DeepSeek V4.1 Flash vs GPT-5.5
As of Oct 15, 2026, DeepSeek V4.1 Flash leads GPT-5.5 in 1 of 8 shared categories: Coding › Web dev.
DeepSeek V4.1 Flash
Yes. Yes on General LLM (best per dollar); Reasoning (best per dollar). Not the overall leader.
GPT-5.5
It used to be. Was SOTA in General LLM.
| Category | DeepSeek V4.1 Flash | GPT-5.5 |
|---|---|---|
| General LLM | #29 · #29 in General LLM Margin 19.72789115646259 LMArena leaderboard dataset · Oct 13, 2026 | #21 · Was SOTA · General LLM Margin 14.285714285714292 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #27 · #27 in Reasoning Margin 19.178082191780817 LMArena leaderboard dataset · Oct 13, 2026 | #25 · #25 in Reasoning Margin 17.808219178082197 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #36 · #36 in Science Margin — Epoch AI benchmarking hub · Sep 9, 2026 | #30 · #30 in Science Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
| Coding | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Web dev | #19 · #19 in Coding › Web dev Margin 16.822429906542055 LMArena leaderboard dataset · Oct 13, 2026 | #44 · #44 in Coding › Web dev Margin 40.18691588785047 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #32 · #32 in Long context Margin 21.768707482993193 LMArena leaderboard dataset · Oct 13, 2026 | #23 · Was SOTA · Long context Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #21 · #21 in Vision Margin 57.89473684210526 Epoch AI benchmarking hub · Sep 9, 2026 | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 |
| Factuality | #22 · #22 in Factuality Margin 17.164179104477626 LMArena leaderboard dataset · Oct 13, 2026 | #5 · Was SOTA · Factuality Margin 4.477611940298502 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #8 · #8 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 9, 2026 | #7 · #7 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
DeepSeek V4.1 Flash: $0.23463 per 1M blended tokens.
GPT-5.5: $11.25 per 1M blended tokens.
DeepSeek V4.1 Flash: open weights.
GPT-5.5: closed weights.
General LLM: As of Oct 15, 2026, GPT-5.5 leads DeepSeek V4.1 Flash in General LLM at #21 against #29.
Reasoning: As of Oct 15, 2026, GPT-5.5 leads DeepSeek V4.1 Flash in Reasoning at #25 against #27.
Science: As of Oct 15, 2026, GPT-5.5 leads DeepSeek V4.1 Flash in Science at #30 against #36.
Coding › Web dev: As of Oct 15, 2026, DeepSeek V4.1 Flash leads GPT-5.5 in Coding › Web dev at #19 against #44.
Long context: As of Oct 15, 2026, GPT-5.5 leads DeepSeek V4.1 Flash in Long context at #23 against #32.
Vision: As of Oct 15, 2026, GPT-5.5 leads DeepSeek V4.1 Flash in Vision at #10 against #21.
Factuality: As of Oct 15, 2026, GPT-5.5 leads DeepSeek V4.1 Flash in Factuality at #5 against #22.
Abstraction (ARC): As of Oct 15, 2026, GPT-5.5 leads DeepSeek V4.1 Flash in Abstraction (ARC) at #7 against #8.
DeepSeek V4.1 Flash or GPT-5.5?
As of Oct 15, 2026, DeepSeek V4.1 Flash leads GPT-5.5 in 1 of 8 shared categories: Coding › Web dev.
DeepSeek V4.1 Flash or GPT-5.5 for General LLM?
As of Oct 15, 2026, GPT-5.5 leads DeepSeek V4.1 Flash in General LLM at #21 against #29.
DeepSeek V4.1 Flash or GPT-5.5 for Reasoning?
As of Oct 15, 2026, GPT-5.5 leads DeepSeek V4.1 Flash in Reasoning at #25 against #27.
DeepSeek V4.1 Flash or GPT-5.5 for Science?
As of Oct 15, 2026, GPT-5.5 leads DeepSeek V4.1 Flash in Science at #30 against #36.