# GPT-5.4 vs GPT-5.5 Instant

As of Oct 14, 2026, GPT-5.4 leads GPT-5.5 Instant in 5 of 5 shared categories: General LLM, Reasoning, Science, Long context, and Factuality.

GPT-5.4: $5.625 per 1M blended tokens.

GPT-5.5 Instant: price per 1M tokens is unset in the catalog.

GPT-5.4: closed weights.

GPT-5.5 Instant: closed weights.

- Which to pick, General LLM: As of Oct 14, 2026, GPT-5.4 leads GPT-5.5 Instant in General LLM at #28 against #31.
- Which to pick, Reasoning: As of Oct 14, 2026, GPT-5.4 leads GPT-5.5 Instant in Reasoning at #29 against #33.
- Which to pick, Science: As of Oct 14, 2026, GPT-5.4 leads GPT-5.5 Instant in Science at #16 against #65.
- Which to pick, Long context: As of Oct 14, 2026, GPT-5.4 leads GPT-5.5 Instant in Long context at #34 against #39.
- Which to pick, Factuality: As of Oct 14, 2026, GPT-5.4 leads GPT-5.5 Instant in Factuality at #6 against #64.

As of Oct 14, 2026, GPT-5.4 is a former state-of-the-art holder in General LLM (since Apr 10, 2026; sources LMArena Text (style-controlled, overall); methodology v1.0).

As of Oct 14, 2026, GPT-5.5 Instant is ranked #31 in General LLM (since Oct 14, 2026; sources LMArena Text (style-controlled, overall); methodology v1.0).