MoonshotAI: Kimi K3 vs OpenAI: GPT-5.3-Codex
MoonshotAI: Kimi K3 wins on more metrics (4 of 7), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | MoonshotAI: Kimi K3 | OpenAI: GPT-5.3-Codex |
|---|---|---|
| Intelligence Index | 57.1✓ | 44.3 |
| Coding Index | 76.2✓ | — |
| GPQA Diamond | 94%✓ | 92% |
| Design Arena Elo | — | 1199✓ |
| Speed (tokens/sec) | — | — |
| Latency | — | — |
| Input price /M | $3.00 | $1.75✓ |
| Output price /M | $15.00 | $14.00✓ |
| Context window | 1.0M✓ | 400K |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSONVision |