GLM 5.1 vs GPT-5.4 Pro
GLM 5.1 
GPT-5.4 Pro Verdict
- GPT-5.4 Pro leads on quality: 64.3 vs 58.8.
- GLM 5.1 is stronger in agents & tools, coding, composite, human preference, instruction following, long context, maths.
- GPT-5.4 Pro is stronger in knowledge, reasoning, multimodal.
- GLM 5.1 is 31× cheaper ($2.15 vs $67.50 per 1M blended).
- GLM 5.1 streams 71.9× faster (72 vs 1 tokens per second).
| Metric | GLM 5.1 | GPT-5.4 Pro |
|---|---|---|
| BenchLeader Index | 58.8 | 64.3 |
| Agents & tools score | 55.6 | – |
| Coding score | 57.2 | – |
| Composite score | 56.9 | – |
| Human preference score | 66.4 | – |
| Instruction following score | 70.9 | 67.3 |
| Knowledge score | 55.9 | 73.6 |
| Long context score | 60.3 | – |
| Maths score | 53.0 | – |
| Reasoning score | 61.4 | 75.3 |
| Multimodal score | – | 69.8 |
| Blended price $/M | $2.15 | $67.50 |
| Output speed | 72 tok/s | 1 tok/s |
| Time to first answer | 54.4 s | 6.3 s |
| Context window | 200k | 1.1M |
| GPQA Diamond | 89.9% | – |
| FrontierMath Tiers 1–3 | 36.8% | – |
| OTIS Mock AIME | 93.3% | – |
| SWE-bench Verified (Epoch) | 74.2% | – |
| SimpleQA Verified | 34.0% | – |
| Humanity's Last Exam | – | 44.3% |
| SimpleBench | 55.1% | 74.1% |
| SciCode | 43.8% | – |
| WeirdML | 57.1% | – |
| ProofBench | 22.2% | – |
| Epoch Capabilities Index | 149.7 | 158.9 |
| LMArena Text | 1465 | – |
| LMArena Hard Prompts | 1489 | – |
| LMArena Coding | 1513 | – |
| LMArena WebDev | 1508 | – |
| AA Intelligence Index | 26.4 | – |
| IFBench | 76.3% | – |
| AA-LCR | 73.7% | – |
| AA-Omniscience | 0.8 | – |
| Terminal-Bench Hard | 43.2% | – |
| GPQA Diamond (AA) | 86.8% | – |
| Humanity's Last Exam (AA) | 30.1% | – |
| SciCode (AA) | 44.8% | – |
| τ²-Bench Telecom (AA) | 97.7% | – |
| AIME (Vals) | 91.9% | – |
| LiveCodeBench | 81.4% | – |
| MMLU-Pro | 86.9% | – |
| LegalBench | 84.4% | – |
| CorpFin | 64.5% | – |
| TaxEval | 71.2% | – |
| Terminal-Bench 2.1 (Vals) | 56.9% | – |
| SWE-bench (Vals) | 76.4% | – |
| GPQA Diamond (Vals) | 84.5% | – |
| AIME 2026 | 95.8% | – |
| HMMT February 2026 | 89.4% | – |
| MathArena Apex | 11.5% | – |
| MCP Atlas | 75.6% | – |
| MultiChallenge | – | 69.2% |
| VISTA | – | 53.9% |
| MultiNRC | – | 62.3% |
| TutorBench | – | 56.6% |
Data as of 2026-09-13. Best configuration of each model; every score links to its source on the model pages.
GLM 5.1 vs GPT-5.4 Pro: questions
- Is GLM 5.1 better than GPT-5.4 Pro?
- GPT-5.4 Pro leads on quality: 64.3 vs 58.8. The BenchLeader Index combines every independent quality benchmark; GPT-5.4 Pro is ahead overall as of 2026-09-13, but check the category scores for your use.
- Which is cheaper, GLM 5.1 or GPT-5.4 Pro?
- GLM 5.1 is cheaper: $2.15 against $67.50 per million tokens, blended at three input tokens per output token.
- Which is faster, GLM 5.1 or GPT-5.4 Pro?
- GLM 5.1 streams faster: 72 against 1 output tokens per second.
- Which has the larger context window?
- GPT-5.4 Pro accepts more context: 1.1M against 200k tokens.