# Claude Sonnet 5.5 vs DeepSeek R1 0528

As of Oct 15, 2026, Claude Sonnet 5.5 leads DeepSeek R1 0528 in 4 of 4 shared categories: General LLM, Reasoning, Science, and Long context.

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

DeepSeek R1 0528: $0.9125000000000001 per 1M blended tokens.

Claude Sonnet 5.5: closed weights.

DeepSeek R1 0528: open weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Sonnet 5.5 leads DeepSeek R1 0528 in General LLM at #29 against #119.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Sonnet 5.5 leads DeepSeek R1 0528 in Reasoning at #18 against #127.
- Which to pick, Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads DeepSeek R1 0528 in Science at #3 against #78.
- Which to pick, Long context: As of Oct 15, 2026, Claude Sonnet 5.5 leads DeepSeek R1 0528 in Long context at #11 against #150.

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, DeepSeek R1 0528 is a former state-of-the-art holder in General LLM (since Aug 7, 2025; sources LMArena Text (style-controlled, overall); methodology v1.0).