GPT-5.5 Instant vs O3 Mini
As of Oct 15, 2026, GPT-5.5 Instant leads O3 Mini in 3 of 4 shared categories: Reasoning, Science, and Long context.
GPT-5.5 Instant
#36 Best current rank: #36 in General LLM, as of Oct 15, 2026.
O3 Mini
It used to be. Was SOTA in Reasoning.
| Category | GPT-5.5 Instant | O3 Mini |
|---|---|---|
| General LLM | #36 · #36 in General LLM Margin 19.148936170212764 LMArena leaderboard dataset · Oct 13, 2026 | #10 · #10 in General LLM Margin — LMArena leaderboard dataset · Apr 16, 2025 |
| Reasoning | #38 · #38 in Reasoning Margin 20.744680851063833 LMArena leaderboard dataset · Oct 13, 2026 | #172 · Was SOTA · Reasoning Margin 92.02127659574468 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 | #65 · #65 in Science Margin — Epoch AI benchmarking hub · May 5, 2026 | #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 |
| Long context | #46 · #46 in Long context Margin 24.468085106382972 LMArena leaderboard dataset · Oct 13, 2026 | #186 · #186 in Long context Margin 98.93617021276596 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 | — |
| Factuality | #78 · #78 in Factuality Margin 45.93023255813954 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 |
GPT-5.5 Instant: price per 1M tokens is unset in the catalog.
O3 Mini: $1.9250000000000003 per 1M blended tokens.
GPT-5.5 Instant: closed weights.
O3 Mini: closed weights.
General LLM: As of Oct 15, 2026, O3 Mini leads GPT-5.5 Instant in General LLM at #10 against #36.
Reasoning: As of Oct 15, 2026, GPT-5.5 Instant leads O3 Mini in Reasoning at #38 against #172.
Science: As of Oct 15, 2026, GPT-5.5 Instant leads O3 Mini in Science at #65 against #76.
Long context: As of Oct 15, 2026, GPT-5.5 Instant leads O3 Mini in Long context at #46 against #186.
GPT-5.5 Instant or O3 Mini?
As of Oct 15, 2026, GPT-5.5 Instant leads O3 Mini in 3 of 4 shared categories: Reasoning, Science, and Long context.
GPT-5.5 Instant or O3 Mini for General LLM?
As of Oct 15, 2026, O3 Mini leads GPT-5.5 Instant in General LLM at #10 against #36.
GPT-5.5 Instant or O3 Mini for Reasoning?
As of Oct 15, 2026, GPT-5.5 Instant leads O3 Mini in Reasoning at #38 against #172.
GPT-5.5 Instant or O3 Mini for Science?
As of Oct 15, 2026, GPT-5.5 Instant leads O3 Mini in Science at #65 against #76.