DeepSeek V4 Flash vs O3 Mini
As of Oct 14, 2026, DeepSeek V4 Flash leads O3 Mini in 2 of 3 shared categories: Reasoning and Long context.
DeepSeek V4 Flash
Yes. Yes on General LLM (best per dollar); Reasoning (best per dollar). Not the overall leader.
O3 Mini
It used to be. Was SOTA in Reasoning.
| Category | DeepSeek V4 Flash | O3 Mini |
|---|---|---|
| General LLM | #75 · #75 in General LLM Margin 51.02040816326531 LMArena leaderboard dataset · Oct 13, 2026 | #7 · #7 in General LLM Margin — LMArena leaderboard dataset · Apr 16, 2025 |
| Reasoning | #72 · #72 in Reasoning Margin 50 LMArena leaderboard dataset · Oct 13, 2026 | #133 · Was SOTA · Reasoning Margin 91.78082191780823 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 | — | #76 · #76 in Science Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| 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 | — |
| Long context | #69 · #69 in Long context Margin 46.93877551020408 LMArena leaderboard dataset · Oct 13, 2026 | #145 · #145 in Long context Margin 98.63945578231292 LMArena leaderboard dataset · Oct 13, 2026 |
| Factuality | #66 · #66 in Factuality Margin 50 LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| Abstraction (ARC) | — | #51 · #51 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
DeepSeek V4 Flash: $0.11374999999999999 per 1M blended tokens.
O3 Mini: $1.9250000000000003 per 1M blended tokens.
DeepSeek V4 Flash: open weights.
O3 Mini: closed weights.
General LLM: As of Oct 14, 2026, O3 Mini leads DeepSeek V4 Flash in General LLM at #7 against #75.
Reasoning: As of Oct 14, 2026, DeepSeek V4 Flash leads O3 Mini in Reasoning at #72 against #133.
Long context: As of Oct 14, 2026, DeepSeek V4 Flash leads O3 Mini in Long context at #69 against #145.
DeepSeek V4 Flash or O3 Mini?
As of Oct 14, 2026, DeepSeek V4 Flash leads O3 Mini in 2 of 3 shared categories: Reasoning and Long context.
DeepSeek V4 Flash or O3 Mini for General LLM?
As of Oct 14, 2026, O3 Mini leads DeepSeek V4 Flash in General LLM at #7 against #75.
DeepSeek V4 Flash or O3 Mini for Reasoning?
As of Oct 14, 2026, DeepSeek V4 Flash leads O3 Mini in Reasoning at #72 against #133.
DeepSeek V4 Flash or O3 Mini for Long context?
As of Oct 14, 2026, DeepSeek V4 Flash leads O3 Mini in Long context at #69 against #145.