GPT-5.6 Terra vs GPT-5 Pro
GPT-5.6 Terra Verdict
- GPT-5.6 Terra (xhigh) leads on quality: 64.4 vs 60.8.
- GPT-5.6 Terra (xhigh) is stronger in agents & tools, coding, composite, human preference, instruction following, long context, maths, reasoning.
- GPT-5 Pro is stronger in knowledge, multimodal.
- GPT-5.6 Terra (xhigh) is 9.2× cheaper ($4.50 vs $41.25 per 1M blended).
| Metric | GPT-5.6 Terra (xhigh) | GPT-5 Pro |
|---|---|---|
| BenchLeader Index | 64.4 | 60.8 |
| Agents & tools score | 69.8 | – |
| Coding score | 63.7 | – |
| Composite score | 77.3 | – |
| Human preference score | 66.7 | – |
| Instruction following score | 65.3 | – |
| Knowledge score | 61.0 | 68.0 |
| Long context score | 66.0 | – |
| Maths score | 71.0 | – |
| Multimodal score | 63.0 | 67.4 |
| Reasoning score | 58.6 | 57.6 |
| Blended price $/M | $4.50 | $41.25 |
| Output speed | 79 tok/s | – |
| Time to first answer | 33.6 s | – |
| Context window | 1M | 400k |
| Humanity's Last Exam | – | 31.6% |
| SimpleBench | 48.9% | 61.6% |
| SciCode | 51.6% | – |
| ProofBench | 74.0% | – |
| Epoch Capabilities Index | – | 150.3 |
| LMArena Text | 1466 | – |
| LMArena Hard Prompts | 1491 | – |
| LMArena Coding | 1519 | – |
| LMArena WebDev | 1521 | – |
| LMArena Vision | 1269 | – |
| LMArena Agent | 1.5 | – |
| AA Intelligence Index | 38.2 | – |
| IFBench | 66.3% | – |
| AA-LCR | 79.0% | – |
| MMMU-Pro | 79.5% | – |
| AA-Omniscience | -3.0 | – |
| Terminal-Bench Hard | 62.9% | – |
| GPQA Diamond (AA) | 90.8% | – |
| Humanity's Last Exam (AA) | 41.9% | – |
| SciCode (AA) | 52.3% | – |
| τ²-Bench Telecom (AA) | 80.4% | – |
| LiveCodeBench | 85.9% | – |
| MMLU-Pro | 86.7% | – |
| IOI | 65.3% | – |
| CorpFin | 65.3% | – |
| TaxEval | 76.2% | – |
| GPQA Diamond (Vals) | 90.9% | – |
| PRBench Finance | – | 51.1% |
| PRBench Legal | – | 49.9% |
| VISTA | – | 52.4% |
| MultiNRC | – | 65.2% |
| Kagi LLM Benchmark | – | 76.8% |
| ARC-AGI-1 | 94.0% | 70.2% |
| ARC-AGI-2 | 74.2% | 18.3% |
| ARC-AGI-3 | 0.7% | – |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
GPT-5.6 Terra vs GPT-5 Pro: questions
- Is GPT-5.6 Terra better than GPT-5 Pro?
- GPT-5.6 Terra (xhigh) leads on quality: 64.4 vs 60.8. The BenchLeader Index combines every independent quality benchmark; GPT-5.6 Terra (xhigh) is ahead overall as of 2026-09-10, but check the category scores for your use.
- Which is cheaper, GPT-5.6 Terra or GPT-5 Pro?
- GPT-5.6 Terra is cheaper: $4.50 against $41.25 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- GPT-5.6 Terra accepts more context: 1M against 400k tokens.