# Claude Sonnet 5.5 vs Gemini 3.1 Pro Preview

As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.1 Pro Preview in 5 of 8 shared categories: Science, Coding › Web dev, Long context, Vision, and Factuality.

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

Gemini 3.1 Pro Preview: $4.5 per 1M blended tokens.

Claude Sonnet 5.5: closed weights.

Gemini 3.1 Pro Preview: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Gemini 3.1 Pro Preview leads Claude Sonnet 5.5 in General LLM at #15 against #29.
- Which to pick, Reasoning: As of Oct 15, 2026, Gemini 3.1 Pro Preview leads Claude Sonnet 5.5 in Reasoning at #14 against #18.
- Which to pick, Math: As of Oct 15, 2026, Gemini 3.1 Pro Preview leads Claude Sonnet 5.5 in Math at #3 against #4.
- Which to pick, Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.1 Pro Preview in Science at #3 against #7.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.1 Pro Preview in Coding › Web dev at #3 against #63.
- Which to pick, Long context: As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.1 Pro Preview in Long context at #11 against #12.
- Which to pick, Vision: As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.1 Pro Preview in Vision at #1 against #25.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.1 Pro Preview in Factuality at #17 against #21.

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).

As of Oct 15, 2026, Gemini 3.1 Pro Preview is state of the art on best per dollar in Math (since Oct 14, 2026; sources Humanity's Last Exam; methodology v1.0).