Qwen3.5 27B Tops Math Showdown

This is a good reminder that “best at math” is often about the exact prompt, the model’s reasoning style, and whether it self-checks well, not just raw brand prestige. Qwen3.5-27B looks like a seriously competitive open-weight math model, but one Reddit test is not a universal leaderboard.

• –The official Qwen3.5-27B model card shows strong math scores, including MathArena AIME 2026 and HMMT Feb 2026 results.
• –The thread’s comparison is useful signal, but it is not a controlled benchmark: prompt wording, sampling settings, and solution verification all matter.
• –For probability or derivation-heavy work, pairing an LLM with symbolic checking or Python validation is still the safest workflow.
• –If you want a local or open model, Qwen3.5-27B is now in the “worth trying first” tier for reasoning-heavy math tasks.