# 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: 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.

- Which to pick, General LLM: As of Oct 15, 2026, O3 Mini leads GPT-5.5 Instant in General LLM at #10 against #36.
- Which to pick, Reasoning: As of Oct 15, 2026, GPT-5.5 Instant leads O3 Mini in Reasoning at #38 against #172.
- Which to pick, Science: As of Oct 15, 2026, GPT-5.5 Instant leads O3 Mini in Science at #65 against #76.
- Which to pick, Long context: As of Oct 15, 2026, GPT-5.5 Instant leads O3 Mini in Long context at #46 against #186.

As of Oct 15, 2026, GPT-5.5 Instant is ranked #36 in General LLM (since Oct 15, 2026; sources LMArena Text (style-controlled, overall); methodology v1.0).

As of Oct 15, 2026, O3 Mini is a former state-of-the-art holder in Reasoning (since Feb 9, 2025; sources LMArena Text (style-controlled, hard prompts); methodology v1.0).