# Claude Sonnet 4 vs Claude Sonnet 5.5

As of Oct 15, 2026, Claude Sonnet 4 leads Claude Sonnet 5.5 in 0 of 5 shared categories.

Claude Sonnet 4: $6 per 1M blended tokens.

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

Claude Sonnet 4: closed weights.

Claude Sonnet 5.5: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 4 in General LLM at #29 against #163.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 4 in Reasoning at #18 against #149.
- Which to pick, Math: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 4 in Math at #4 against #35.
- Which to pick, Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 4 in Science at #3 against #97.
- Which to pick, Long context: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 4 in Long context at #11 against #123.

As of Oct 15, 2026, Claude Sonnet 4 is ranked #35 in Math (since Oct 15, 2026; sources Humanity's Last Exam; methodology v1.0).

As of Oct 15, 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).