GPT-5.6 Terra vs Kimi K3
GPT-5.6 Terra vs Kimi K3: which AI model is cheaper, has the larger context window and more capabilities? Side-by-side comparison updated daily.
Quick verdict
- GPT-5.6 Terra is 1.3× cheaper than Kimi K3 for the same mix of input and output tokens.
- GPT-5.6 Terra 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-5.6 Terra scores higher on independent tests (overall index 159.3 vs 157.7).
- GPT-5.6 Terra is both cheaper and better rated: for most uses it is the better choice.
| GPT-5.6 Terra | Kimi K3 | |
|---|---|---|
| Company | OpenAI | Moonshot AI |
| Released | Jul 9, 2026 | Jul 16, 2026 ● |
| Overall index | 159.3 ● | 157.7 |
| GPQA Diamond | 93.3% ● | 93.1% |
| AIME math | 100% ● | 97.2% |
| FrontierMath | 86.0% ● | 72.2% |
| SimpleQA Verified | 43.2% | 50.6% ● |
| Input (per 1M tokens) | $2 ● | $3 |
| Output (per 1M tokens) | $12 ● | $15 |
| Cost for 1M input + 1M output tokens | $14.00 ● | $18.00 |
| Providers | 7 | 22 ● |
| Context | 1.1M ● | 1M |
| Max output | 128K | 944K ● |
| Inputs | Files, Image, Text | Text, Image, Video |
| Outputs | Text | Text |
| Reasoning | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Open weights | — | ✓ |