Grok 4.6 vs GPT-6 Luna: Benchmark Comparison
Grok 4.6 has the higher score on 14 of 20 shared benchmarks; GPT-6 Luna leads on 6.
The largest observed score gap is 19.19 pts on SAGE , where GPT-6 Luna leads.
Reported ±1 standard-error ranges overlap on 9 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 4.6 | GPT-6 Luna | Gap | Reported uncertainty |
|---|---|---|---|---|
| Vals Index | 52.09% ±1.15 | 51.22% ±1.07 | 0.88 pts | Reported ±1 SE ranges overlap |
| Harvey's Legal Agent Benchmark | 15.83% ±2.65 | 2.92% ±1.36 | 12.92 pts | Reported ±1 SE ranges do not overlap |
| Legal Research Bench | 48.08% ±3.47 | 30.29% ±3.19 | 17.79 pts | Reported ±1 SE ranges do not overlap |
| EMB | 62.73% ±3.08 | 68.52% ±2.81 | 5.79 pts | Reported ±1 SE ranges overlap |
| Finance Agent (v2) | 53.68% ±0.67 | 49.87% ±0.23 | 3.81 pts | Reported ±1 SE ranges do not overlap |
| Tax Agent Bench | 70.79% ±3.00 | 58.86% ±3.21 | 11.92 pts | Reported ±1 SE ranges do not overlap |
| MedCode | 44.71% ±2.26 | 44.69% ±2.30 | 0.03 pts | Reported ±1 SE ranges overlap |
| MedScribe | 86.53% ±1.96 | 83.71% ±1.95 | 2.82 pts | Reported ±1 SE ranges overlap |
| ProofBench v1.1 | 51.00% ±5.02 | 64.00% ±4.82 | 13.00 pts | Reported ±1 SE ranges do not overlap |
| BioMysteryBench | 72.22% ±0.00 | 61.48% ±2.59 | 10.74 pts | Reported ±1 SE ranges do not overlap |
| MysteryMechanism | 30.63% ±3.10 | 19.37% ±2.66 | 11.26 pts | Reported ±1 SE ranges do not overlap |
| Terminal-Bench Science | 11.43% ±3.83 | 4.29% ±2.44 | 7.14 pts | Reported ±1 SE ranges do not overlap |
| SAGE | 28.90% ±3.08 | 48.09% ±3.38 | 19.19 pts | Reported ±1 SE ranges do not overlap |
| Code Migration | 44.57% ±4.48 | 42.55% ±4.42 | 2.02 pts | Reported ±1 SE ranges overlap |
| IOI | 47.61% ±2.09 | 55.56% ±8.87 | 7.95 pts | Reported ±1 SE ranges overlap |
| ProgramBench | 1.00% ±0.70 | 0.50% ±0.50 | 0.50 pts | Reported ±1 SE ranges overlap |
| Terminal-Bench 4.0 | 17.17% ±1.34 | 13.64% ±1.51 | 3.54 pts | Reported ±1 SE ranges do not overlap |
| Vibe Code Bench v1.1 | 76.24% ±3.82 | 81.65% ±3.38 | 5.41 pts | Reported ±1 SE ranges overlap |
| CyberBench v1.1 | 67.68% ±5.87 | 76.25% ±5.29 | 8.57 pts | Reported ±1 SE ranges overlap |
| Public Benefits Bench v1.1 | 66.85% ±1.23 | 57.65% ±1.28 | 9.20 pts | Reported ±1 SE ranges do not overlap |
Performance by category
| Category | Grok 4.6 average | GPT-6 Luna average |
|---|---|---|
| Legal | 31.95% | 16.60% |
| Finance | 62.40% | 59.08% |
| Healthcare | 65.62% | 64.20% |
| Math | 51.00% | 64.00% |
| Science | 38.09% | 28.38% |
| Education | 28.90% | 48.09% |
| Coding | 37.32% | 38.78% |
| Cyber | 67.68% | 76.25% |
| Social Mobility | 66.85% | 57.65% |
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 4.6 cost | GPT-6 Luna cost | Grok 4.6 latency | GPT-6 Luna latency |
|---|---|---|---|---|
| Vals Index | $4.49 | $0.43 | 37m01s | 30m34s |
| Harvey's Legal Agent Benchmark | $4.01 | $0.30 | 45m05s | 17m32s |
| Legal Research Bench | $1.53 | $0.44 | 25m04s | 42m28s |
| EMB | $3.06 | $0.14 | 52m59s | 17m21s |
| Finance Agent (v2) | $1.66 | $0.12 | 16m41s | 14m58s |
| Tax Agent Bench | $0.98 | $0.19 | 10m58s | 33m16s |
| MedCode | N/A | N/A | 2m07s | 108.77s |
| MedScribe | N/A | N/A | 70.94s | 2m50s |
| ProofBench v1.1 | $0.76 | $0.04 | 14m22s | 7m31s |
| BioMysteryBench | $1.23 | $0.05 | 14m18s | 8m44s |
| MysteryMechanism | $1.31 | $0.03 | 27m55s | 6m01s |
| Terminal-Bench Science | $4.82 | $0.24 | 1h18m | 1h16m |
| SAGE | N/A | N/A | 3m22s | 91.07s |
| Code Migration | $14.58 | $0.60 | 1h30m | 50m23s |
| IOI | $8.18 | $0.20 | 3h57m | 35m47s |
| ProgramBench | $16.76 | $0.18 | 4h27m | 28m55s |
| Terminal-Bench 4.0 | $5.07 | $0.35 | 29m27s | 32m46s |
| Vibe Code Bench v1.1 | $4.88 | $1.35 | 25m30s | 37m00s |
| CyberBench v1.1 | $4.07 | $0.13 | 36m52s | 15m50s |
| Public Benefits Bench v1.1 | $0.92 | $0.22 | 25m53s | 52m59s |
Results available only for Grok 4.6
- Vals RSI Index
- LegalBench
- MortgageTax
- TaxEval v2
- GPQA Diamond
- MMLU Pro
- LiveCodeBench
- SkillsBench
- SWE-bench
- Vibe Code Bench 1-100
- Time Horizon Index: KSP
Results available only for GPT-6 Luna
None.