# GPT-5.5 vs O4 Mini

As of Oct 15, 2026, GPT-5.5 leads O4 Mini in 5 of 5 shared categories: General LLM, Reasoning, Science, Factuality, and Abstraction (ARC).

GPT-5.5: $11.25 per 1M blended tokens.

O4 Mini: $1.9250000000000003 per 1M blended tokens.

GPT-5.5: closed weights.

O4 Mini: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, GPT-5.5 leads O4 Mini in General LLM at #22 against #162.
- Which to pick, Reasoning: As of Oct 15, 2026, GPT-5.5 leads O4 Mini in Reasoning at #26 against #168.
- Which to pick, Science: As of Oct 15, 2026, GPT-5.5 leads O4 Mini in Science at #30 against #70.
- Which to pick, Factuality: As of Oct 15, 2026, GPT-5.5 leads O4 Mini in Factuality at #5 against #160.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, GPT-5.5 leads O4 Mini in Abstraction (ARC) at #7 against #39.

As of Oct 15, 2026, GPT-5.5 is near state of the art, rank #5 in Factuality (since Oct 15, 2026; sources LMArena Text factuality; methodology v1.0).

As of Oct 15, 2026, O4 Mini is a former state-of-the-art holder in Math (since Jul 20, 2025; sources Humanity's Last Exam; methodology v1.0).