GPT-5.4 Pro vs Kimi K3
GPT-5.4 Pro vs Kimi K3: which AI model is cheaper, has the larger context window and more capabilities? Side-by-side comparison updated daily.
Quick verdict
- Kimi K3 is 11× cheaper than GPT-5.4 Pro for the same mix of input and output tokens.
- GPT-5.4 Pro has the larger context window (1.1M), useful for long documents and big codebases.
- Kimi K3 is the more recent release (Jul 16, 2026).
- Only Kimi K3 has openly published weights you can run yourself.
- GPT-5.4 Pro scores higher on independent tests (overall index 159.1 vs 157.7).
- Choose Kimi K3 if cost matters most; choose GPT-5.4 Pro if you need its specific strengths above. For the best results, test both on your own prompts.
| GPT-5.4 Pro | Kimi K3 | |
|---|---|---|
| Company | OpenAI | Moonshot AI |
| Released | Mar 5, 2026 | Jul 16, 2026 ● |
| Overall index | 159.1 ● | 157.7 |
| GPQA Diamond | 94.6% ● | 93.1% |
| AIME math | — | 97.2% |
| FrontierMath | 82.5% ● | 72.2% |
| SimpleQA Verified | 46.3% | 50.6% ● |
| Input (per 1M tokens) | $30 | $3 ● |
| Output (per 1M tokens) | $180 | $15 ● |
| Cost for 1M input + 1M output tokens | $210 | $18.00 ● |
| Providers | 3 | 22 ● |
| Context | 1.1M ● | 1M |
| Max output | 128K | 944K ● |
| Inputs | Text, Image, Files | Text, Image, Video |
| Outputs | Text | Text |
| Reasoning | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Open weights | — | ✓ |