OpenAI o3 vs. Gemini 2.5 vs. OpenAI o4-Mini on Coding
Quick answer. o3 remains a strong reasoning-tier coder for math-heavy work but is now mid-tier in 2026 — GPT-5 (74.9% SWE-bench Verified) and GPT-5.5 (58.6% SWE-Bench Pro) clearly lead. Gemini 2.5 is best for long-context refactors; o4-mini is the cheap, fast pick for boilerplate. Reach for o3