# Claude Sonnet 5.5 vs O4 Mini

As of Oct 14, 2026, Claude Sonnet 5.5 leads O4 Mini in 5 of 5 shared categories: General LLM, Reasoning, Math, Science, and Factuality.

Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.

O4 Mini: $1.9250000000000003 per 1M blended tokens.

Claude Sonnet 5.5: closed weights.

O4 Mini: closed weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Sonnet 5.5 leads O4 Mini in General LLM at #27 against #125.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Sonnet 5.5 leads O4 Mini in Reasoning at #18 against #129.
- Which to pick, Math: As of Oct 14, 2026, Claude Sonnet 5.5 leads O4 Mini in Math at #4 against #23.
- Which to pick, Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads O4 Mini in Science at #3 against #70.
- Which to pick, Factuality: As of Oct 14, 2026, Claude Sonnet 5.5 leads O4 Mini in Factuality at #16 against #122.

As of Oct 14, 2026, Claude Sonnet 5.5 is tied for state of the art in Coding (since Oct 6, 2026; sources Terminal-Bench 4.0; methodology v1.0).

As of Oct 14, 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).