GPT-5.6 Terra vs Claude Opus 4.8
GPT-5.6 Terra vs Claude Opus 4.8: 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 2.2× cheaper than Claude Opus 4.8 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.
- GPT-5.6 Terra is the more recent release (Jul 9, 2026).
- GPT-5.6 Terra scores higher on independent tests (overall index 159.3 vs 158.3).
- GPT-5.6 Terra is both cheaper and better rated: for most uses it is the better choice.
| GPT-5.6 Terra | Claude Opus 4.8 | |
|---|---|---|
| Company | OpenAI | Anthropic |
| Released | Jul 9, 2026 ● | May 27, 2026 |
| Overall index | 159.3 ● | 158.3 |
| GPQA Diamond | 93.3% ● | 91.0% |
| AIME math | 100% ● | 98.3% |
| FrontierMath | 86.0% ● | 80.0% |
| SimpleQA Verified | 43.2% | 53.0% ● |
| Input (per 1M tokens) | $2 ● | $5 |
| Output (per 1M tokens) | $12 ● | $25 |
| Cost for 1M input + 1M output tokens | $14.00 ● | $30.00 |
| Providers | 7 | 11 ● |
| Context | 1.1M ● | 1M |
| Max output | 128K | 128K |
| Inputs | Files, Image, Text | Text, Image, Files |
| Outputs | Text | Text |
| Reasoning | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Open weights | — | — |