Grok 4.5 vs GLM 5.3 Flash: Benchmark Comparison
Grok 4.5 has the higher score on 11 of 20 shared benchmarks; GLM 5.3 Flash leads on 8.
The largest observed score gap is 38.24 pts on Vibe Code Bench v1.1 , where Grok 4.5 leads.
Reported ±1 standard-error ranges overlap on 5 of 20 shared benchmarks with comparable uncertainty data. This is not a pairwise statistical significance test.
Shared benchmark results
Scores and reported standard errors come from the latest visible Vals benchmark version available for both models.
| Benchmark | Grok 4.5 | GLM 5.3 Flash | Gap | Reported uncertainty |
|---|---|---|---|---|
| Harvey's Legal Agent Benchmark | 12.92% ±2.53 | 6.67% ±1.65 | 6.25 pts | Reported ±1 SE ranges do not overlap |
| Legal Research Bench | 37.98% ±3.37 | 45.19% ±3.46 | 7.21 pts | Reported ±1 SE ranges do not overlap |
| LegalBench | 85.97% ±0.41 | 83.93% ±0.43 | 2.04 pts | Reported ±1 SE ranges do not overlap |
| EMB | 52.91% ±3.11 | 55.93% ±3.56 | 3.02 pts | Reported ±1 SE ranges overlap |
| Finance Agent (v2) | 48.35% ±0.46 | 57.85% ±2.06 | 9.50 pts | Reported ±1 SE ranges do not overlap |
| Tax Agent Bench | 64.32% ±3.16 | 61.96% ±3.26 | 2.37 pts | Reported ±1 SE ranges overlap |
| TaxEval v2 | 71.67% ±0.89 | 75.59% ±0.84 | 3.92 pts | Reported ±1 SE ranges do not overlap |
| MedScribe | 86.88% ±1.94 | 88.94% ±1.91 | 2.05 pts | Reported ±1 SE ranges overlap |
| ProofBench v1.1 | 31.00% ±4.65 | 21.00% ±4.09 | 10.00 pts | Reported ±1 SE ranges do not overlap |
| GPQA Diamond | 92.93% ±1.29 | 86.36% ±2.13 | 6.56 pts | Reported ±1 SE ranges do not overlap |
| MMLU Pro | 89.22% ±0.31 | 86.06% ±0.34 | 3.16 pts | Reported ±1 SE ranges do not overlap |
| MMMU Pro | 61.79% ±1.17 | 86.01% ±0.83 | 24.22 pts | Reported ±1 SE ranges do not overlap |
| Code Migration | 36.60% ±4.14 | 20.52% ±4.21 | 16.08 pts | Reported ±1 SE ranges do not overlap |
| IOI | 40.56% ±3.95 | 52.50% ±2.62 | 11.94 pts | Reported ±1 SE ranges do not overlap |
| LiveCodeBench | 87.35% ±0.96 | 80.51% ±1.05 | 6.84 pts | Reported ±1 SE ranges do not overlap |
| ProgramBench | 0.00% ±0.00 | 0.00% ±0.00 | 0.00 pts | Reported ±1 SE ranges overlap |
| SkillsBench | 66.03% ±4.60 | 40.16% ±4.43 | 25.88 pts | Reported ±1 SE ranges do not overlap |
| SWE-bench | 86.60% ±1.52 | 92.00% ±1.21 | 5.40 pts | Reported ±1 SE ranges do not overlap |
| Vibe Code Bench v1.1 | 69.00% ±4.48 | 30.76% ±5.28 | 38.24 pts | Reported ±1 SE ranges do not overlap |
| CyberBench v1.1 | 71.01% ±5.79 | 67.86% ±5.57 | 3.16 pts | Reported ±1 SE ranges overlap |
Performance by category
| Category | Grok 4.5 average | GLM 5.3 Flash average |
|---|---|---|
| Legal | 45.62% | 45.26% |
| Finance | 59.31% | 62.83% |
| Healthcare | 86.88% | 88.94% |
| Math | 31.00% | 21.00% |
| Academic | 81.31% | 86.14% |
| Coding | 55.16% | 45.21% |
| Cyber | 71.01% | 67.86% |
Cost and latency
Cost per test appears only where the benchmark reports it for both models. Latency is the measured completion time for that benchmark.
| Benchmark | Grok 4.5 cost | GLM 5.3 Flash cost | Grok 4.5 latency | GLM 5.3 Flash latency |
|---|---|---|---|---|
| Harvey's Legal Agent Benchmark | $2.02 | $0.57 | 10m15s | 52m17s |
| Legal Research Bench | $1.09 | $0.12 | 15m54s | 51m07s |
| LegalBench | N/A | N/A | 67.88s | 12.52s |
| EMB | $1.55 | $0.71 | 18m28s | 1h15m |
| Finance Agent (v2) | $1.16 | $0.05 | 4m49s | 14m51s |
| Tax Agent Bench | $0.47 | $0.14 | 4m44s | 21m37s |
| TaxEval v2 | N/A | N/A | 3m15s | 53.06s |
| MedScribe | N/A | N/A | 11m45s | 86.98s |
| ProofBench v1.1 | $0.57 | $0.22 | 11m09s | 1h11m |
| GPQA Diamond | N/A | N/A | 3m38s | 2m11s |
| MMLU Pro | N/A | N/A | 5m58s | 44.76s |
| MMMU Pro | N/A | N/A | 11m55s | 28.22s |
| Code Migration | $3.37 | $3.13 | 23m29s | 3h26m |
| IOI | $5.64 | $0.43 | 1h27m | 1h32m |
| LiveCodeBench | N/A | N/A | 9m49s | 5m02s |
| ProgramBench | $4.12 | $0.80 | 18m59s | 5h30m |
| SkillsBench | $0.58 | $0.04 | 2m16s | 12m09s |
| SWE-bench | $0.54 | $0.02 | 3m20s | 1h04m |
| Vibe Code Bench v1.1 | $4.10 | $2.35 | 13m50s | 1h24m |
| CyberBench v1.1 | $2.95 | $0.14 | 14m08s | 35m48s |
Results available only for Grok 4.5
- Vals Index
- MortgageTax
- MedCode
- SAGE
- Terminal-Bench 4.0
- SRE Bench
- Time Horizon Index: KSP
Results available only for GLM 5.3 Flash
- Terminal-Bench Science
- Vibe Code Bench 1-100