# DeepSeek V4 Pro vs GPT-5.5

As of Oct 15, 2026, DeepSeek V4 Pro leads GPT-5.5 in 1 of 6 shared categories: Science.

DeepSeek V4 Pro: $1.194075 per 1M blended tokens.

GPT-5.5: $11.25 per 1M blended tokens.

DeepSeek V4 Pro: open weights.

GPT-5.5: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, GPT-5.5 leads DeepSeek V4 Pro in General LLM at #22 against #55.
- Which to pick, Reasoning: As of Oct 15, 2026, GPT-5.5 leads DeepSeek V4 Pro in Reasoning at #26 against #57.
- Which to pick, Science: As of Oct 15, 2026, DeepSeek V4 Pro leads GPT-5.5 in Science at #28 against #30.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, GPT-5.5 leads DeepSeek V4 Pro in Coding › Web dev at #48 against #62.
- Which to pick, Long context: As of Oct 15, 2026, GPT-5.5 leads DeepSeek V4 Pro in Long context at #26 against #51.
- Which to pick, Factuality: As of Oct 15, 2026, GPT-5.5 leads DeepSeek V4 Pro in Factuality at #5 against #49.

As of Oct 15, 2026, DeepSeek V4 Pro is ranked #28 in Science (since Oct 15, 2026; sources GPQA Diamond; methodology v1.0).

As of Oct 15, 2026, GPT-5.5 is near state of the art, rank #5 in Factuality (since Oct 15, 2026; sources LMArena Text factuality; methodology v1.0).