DeepSeek V4 Flash vs GPT-5.5
As of Oct 14, 2026, DeepSeek V4 Flash leads GPT-5.5 in 1 of 5 shared categories: Coding › Web dev.
DeepSeek V4 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 Flash | GPT-5.5 |
|---|---|---|
| General LLM | #75 · #75 in General LLM Margin 51.02040816326531 LMArena leaderboard dataset · Oct 13, 2026 | #21 · Was SOTA · General LLM Margin 14.285714285714292 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #72 · #72 in Reasoning Margin 50 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 | — | #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 | #30 · #30 in Coding › Web dev Margin 27.10280373831776 LMArena leaderboard dataset · Oct 13, 2026 | #44 · #44 in Coding › Web dev Margin 40.18691588785047 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #69 · #69 in Long context Margin 46.93877551020408 LMArena leaderboard dataset · Oct 13, 2026 | #23 · Was SOTA · Long context Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | — | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 |
| Factuality | #66 · #66 in Factuality Margin 50 LMArena leaderboard dataset · Oct 13, 2026 | #5 · Was SOTA · Factuality Margin 4.477611940298502 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | — | #7 · #7 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
DeepSeek V4 Flash: $0.11374999999999999 per 1M blended tokens.
GPT-5.5: $11.25 per 1M blended tokens.
DeepSeek V4 Flash: open weights.
GPT-5.5: closed weights.
General LLM: As of Oct 14, 2026, GPT-5.5 leads DeepSeek V4 Flash in General LLM at #21 against #75.
Reasoning: As of Oct 14, 2026, GPT-5.5 leads DeepSeek V4 Flash in Reasoning at #25 against #72.
Coding › Web dev: As of Oct 14, 2026, DeepSeek V4 Flash leads GPT-5.5 in Coding › Web dev at #30 against #44.
Long context: As of Oct 14, 2026, GPT-5.5 leads DeepSeek V4 Flash in Long context at #23 against #69.
Factuality: As of Oct 14, 2026, GPT-5.5 leads DeepSeek V4 Flash in Factuality at #5 against #66.
DeepSeek V4 Flash or GPT-5.5?
As of Oct 14, 2026, DeepSeek V4 Flash leads GPT-5.5 in 1 of 5 shared categories: Coding › Web dev.
DeepSeek V4 Flash or GPT-5.5 for General LLM?
As of Oct 14, 2026, GPT-5.5 leads DeepSeek V4 Flash in General LLM at #21 against #75.
DeepSeek V4 Flash or GPT-5.5 for Reasoning?
As of Oct 14, 2026, GPT-5.5 leads DeepSeek V4 Flash in Reasoning at #25 against #72.
DeepSeek V4 Flash or GPT-5.5 for Coding › Web dev?
As of Oct 14, 2026, DeepSeek V4 Flash leads GPT-5.5 in Coding › Web dev at #30 against #44.