GLM 5.3 Flash vs GPT-5.6 Terra
GLM 5.3 Flash 
GPT-5.6 Terra Verdict
- GPT-5.6 Terra (xhigh) leads on quality: 64.4 vs 61.1.
- GLM 5.3 Flash is stronger in coding, human preference, knowledge, long context, multimodal, reasoning.
- GPT-5.6 Terra (xhigh) is stronger in agents & tools, composite, instruction following, maths.
- GLM 5.3 Flash is 38× cheaper ($0.119 vs $4.50 per 1M blended).
| Metric | GLM 5.3 Flash | GPT-5.6 Terra (xhigh) |
|---|---|---|
| BenchLeader Index | 61.1 | 64.4 |
| Agents & tools score | 52.1 | 69.8 |
| Coding score | 64.3 | 63.7 |
| Composite score | 61.7 | 77.3 |
| Human preference score | 67.6 | 66.7 |
| Knowledge score | 67.7 | 61.0 |
| Long context score | 66.6 | 66.0 |
| Multimodal score | 65.5 | 63.0 |
| Reasoning score | 67.5 | 58.6 |
| Instruction following score | – | 65.3 |
| Maths score | – | 71.0 |
| Blended price $/M | $0.119 | $4.50 |
| Output speed | 90 tok/s | 79 tok/s |
| Time to first answer | 24.9 s | 33.6 s |
| Context window | 1M | 1M |
| SimpleBench | – | 48.9% |
| SciCode | 46.1% | 51.6% |
| ProofBench | – | 74.0% |
| Epoch Capabilities Index | 151.4 | – |
| LMArena Text | 1474 | 1466 |
| LMArena Hard Prompts | 1496 | 1491 |
| LMArena Coding | 1534 | 1519 |
| LMArena WebDev | 1605 | 1521 |
| LMArena Vision | 1296 | 1269 |
| LMArena Agent | 2 | 1.5 |
| LiveBench | 71.6% | – |
| LiveBench Reasoning | 77.6% | – |
| LiveBench Coding | 79.0% | – |
| LiveBench Agentic Coding | 56.8% | – |
| LiveBench Mathematics | 81.2% | – |
| LiveBench Data Analysis | 76.4% | – |
| LiveBench Language | 77.3% | – |
| AA Intelligence Index | 41.9 | 38.2 |
| IFBench | – | 66.3% |
| AA-LCR | 80.0% | 79.0% |
| MMMU-Pro | – | 79.5% |
| AA-Omniscience | 7.5 | -3.0 |
| Terminal-Bench Hard | – | 62.9% |
| GPQA Diamond (AA) | 91.2% | 90.8% |
| Humanity's Last Exam (AA) | 39.9% | 41.9% |
| SciCode (AA) | 51.6% | 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% |
| ARC-AGI-1 | – | 94.0% |
| ARC-AGI-2 | – | 74.2% |
| 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.
GLM 5.3 Flash vs GPT-5.6 Terra: questions
- Is GLM 5.3 Flash better than GPT-5.6 Terra?
- GPT-5.6 Terra (xhigh) leads on quality: 64.4 vs 61.1. 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.
- Is GLM 5.3 Flash better than GPT-5.6 Terra for coding?
- GLM 5.3 Flash scores higher in coding (64 vs 64 on the category index, where 50 is average).
- Is GLM 5.3 Flash better than GPT-5.6 Terra for agentic tasks?
- GPT-5.6 Terra scores higher in agentic tasks (70 vs 52 on the category index, where 50 is average).
- Which is cheaper, GLM 5.3 Flash or GPT-5.6 Terra?
- GLM 5.3 Flash is cheaper: $0.119 against $4.50 per million tokens, blended at three input tokens per output token.
- Which is faster, GLM 5.3 Flash or GPT-5.6 Terra?
- GLM 5.3 Flash streams faster: 90 against 79 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.