| Claude Haiku 4.5 | GPT-5 mini | |
|---|---|---|
| arenaElo | 1274 | 1288 |
| humanEval | 78.2 | 81 |
| sweBench | 40.6 | 50 |
| mmlu | 81.5 | 82.4 |
| gpqa | 48 | 50.1 |
| aime | 60 | 78 |
| Price in/out ($/M) | $1 / $5 | $0.25 / $2 |
GPT-5 mini is cheaper per token ($0.25 vs $1 input) and has 2× the context. Haiku has tighter coding and better safety defaults. Default to GPT-5 mini; upgrade to Haiku if Anthropic compliance matters.