# GPT-5.5 vs Mistral Medium 3.5

As of Oct 14, 2026, GPT-5.5 leads Mistral Medium 3.5 in 5 of 5 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, and Factuality.

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

Mistral Medium 3.5: $3 per 1M blended tokens.

GPT-5.5: closed weights.

Mistral Medium 3.5: open weights.

- Which to pick, General LLM: As of Oct 14, 2026, GPT-5.5 leads Mistral Medium 3.5 in General LLM at #21 against #82.
- Which to pick, Reasoning: As of Oct 14, 2026, GPT-5.5 leads Mistral Medium 3.5 in Reasoning at #25 against #86.
- Which to pick, Coding › Web dev: As of Oct 14, 2026, GPT-5.5 leads Mistral Medium 3.5 in Coding › Web dev at #44 against #99.
- Which to pick, Long context: As of Oct 14, 2026, GPT-5.5 leads Mistral Medium 3.5 in Long context at #23 against #93.
- Which to pick, Factuality: As of Oct 14, 2026, GPT-5.5 leads Mistral Medium 3.5 in Factuality at #5 against #84.

As of Oct 14, 2026, GPT-5.5 is a former state-of-the-art holder in General LLM (since Apr 28, 2026; sources LMArena Text (style-controlled, overall); methodology v1.0).

As of Oct 14, 2026, Mistral Medium 3.5 is ranked #82 in General LLM (since Oct 14, 2026; sources LMArena Text (style-controlled, overall); methodology v1.0).