GPT-4o vs Claude Sonnet 4.6, mainstream Mid-Tier Pick in 2026

GPT-4oClaude Sonnet 4.6
arenaElo13451358
humanEval90.289
sweBench3360
mmlu88.788.7
gpqa53.659.4
aime4280
Price in/out ($/M)$2.5 / $10$3 / $15

Our verdict

Claude Sonnet 4.6 beats GPT-4o on every benchmark and costs less per token. GPT-4o still wins when you need native audio I/O. Default to Sonnet 4.6 for new builds; keep GPT-4o if you already depend on its Realtime API.

GPT-4o · Claude Sonnet 4.6 · All AI model comparisons