Claude Opus 5 vs GPT-5.6 Terra
Claude Opus 5 vs GPT-5.6 Terra: 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 5 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.
- Claude Opus 5 is the more recent release (Jul 24, 2026).
- Claude Opus 5 scores higher on independent tests (overall index 162.7 vs 159.3).
- Choose GPT-5.6 Terra if cost matters most; choose Claude Opus 5 if you need its specific strengths above. For the best results, test both on your own prompts.
| Claude Opus 5 | GPT-5.6 Terra | |
|---|---|---|
| Company | Anthropic | OpenAI |
| Released | Jul 24, 2026 ● | Jul 9, 2026 |
| Overall index | 162.7 ● | 159.3 |
| GPQA Diamond | 93.9% ● | 93.3% |
| AIME math | 98.9% | 100% ● |
| FrontierMath | 85.6% | 86.0% ● |
| SimpleQA Verified | 59.9% ● | 43.2% |
| Input (per 1M tokens) | $5 | $2 ● |
| Output (per 1M tokens) | $25 | $12 ● |
| Cost for 1M input + 1M output tokens | $30.00 | $14.00 ● |
| Providers | 11 ● | 7 |
| Context | 1M | 1.1M ● |
| Max output | 128K | 128K |
| Inputs | Text, Image, Files | Files, Image, Text |
| Outputs | Text | Text |
| Reasoning | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Open weights | — | — |