Kimi K3 vs GPT-6 Luna: Benchmark Comparison
Kimi K3 has the higher score on 13 of 19 shared benchmarks; GPT-6 Luna leads on 6.
The largest observed score gap is 26.46 pts on Code Migration , where GPT-6 Luna leads.
Reported ±1 standard-error ranges overlap on 7 of 19 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 | Kimi K3 | GPT-6 Luna | Gap | Reported uncertainty |
|---|---|---|---|---|
| Vals Index | 50.30% ±0.99 | 51.22% ±1.07 | 0.92 pts | Reported ±1 SE ranges overlap |
| Harvey's Legal Agent Benchmark | 12.92% ±2.68 | 2.92% ±1.36 | 10.00 pts | Reported ±1 SE ranges do not overlap |
| Legal Research Bench | 46.15% ±3.46 | 30.29% ±3.19 | 15.87 pts | Reported ±1 SE ranges do not overlap |
| EMB | 66.68% ±2.87 | 68.52% ±2.81 | 1.84 pts | Reported ±1 SE ranges overlap |
| Finance Agent (v2) | 53.11% ±0.37 | 49.87% ±0.23 | 3.24 pts | Reported ±1 SE ranges do not overlap |
| Tax Agent Bench | 68.67% ±3.08 | 58.86% ±3.21 | 9.81 pts | Reported ±1 SE ranges do not overlap |
| MedCode | 49.36% ±2.20 | 44.69% ±2.30 | 4.67 pts | Reported ±1 SE ranges do not overlap |
| MedScribe | 88.05% ±1.98 | 83.71% ±1.95 | 4.34 pts | Reported ±1 SE ranges do not overlap |
| ProofBench v1.1 | 87.00% ±3.38 | 64.00% ±4.82 | 23.00 pts | Reported ±1 SE ranges do not overlap |
| BioMysteryBench | 72.59% ±1.61 | 61.48% ±2.59 | 11.11 pts | Reported ±1 SE ranges do not overlap |
| Terminal-Bench Science | 1.43% ±1.43 | 4.29% ±2.44 | 2.86 pts | Reported ±1 SE ranges overlap |
| SAGE | 52.78% ±3.41 | 48.09% ±3.38 | 4.69 pts | Reported ±1 SE ranges overlap |
| Code Migration | 16.10% ±4.10 | 42.55% ±4.42 | 26.46 pts | Reported ±1 SE ranges do not overlap |
| IOI | 48.94% ±9.82 | 55.56% ±8.87 | 6.61 pts | Reported ±1 SE ranges overlap |
| ProgramBench | 2.00% ±0.99 | 0.50% ±0.50 | 1.50 pts | Reported ±1 SE ranges do not overlap |
| Terminal-Bench 4.0 | 17.17% ±0.51 | 13.64% ±1.51 | 3.54 pts | Reported ±1 SE ranges do not overlap |
| Vibe Code Bench v1.1 | 84.97% ±2.75 | 81.65% ±3.38 | 3.32 pts | Reported ±1 SE ranges overlap |
| CyberBench v1.1 | 75.24% ±5.56 | 76.25% ±5.29 | 1.01 pts | Reported ±1 SE ranges overlap |
| Public Benefits Bench v1.1 | 68.20% ±1.21 | 57.65% ±1.28 | 10.55 pts | Reported ±1 SE ranges do not overlap |
Performance by category
| Category | Kimi K3 average | GPT-6 Luna average |
|---|---|---|
| Legal | 29.54% | 16.60% |
| Finance | 62.82% | 59.08% |
| Healthcare | 68.70% | 64.20% |
| Math | 87.00% | 64.00% |
| Science | 37.01% | 32.88% |
| Education | 52.78% | 48.09% |
| Coding | 33.84% | 38.78% |
| Cyber | 75.24% | 76.25% |
| Social Mobility | 68.20% | 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 | Kimi K3 cost | GPT-6 Luna cost | Kimi K3 latency | GPT-6 Luna latency |
|---|---|---|---|---|
| Vals Index | $6.38 | $0.43 | 1h08m | 30m34s |
| Harvey's Legal Agent Benchmark | $3.83 | $0.30 | 13m58s | 17m32s |
| Legal Research Bench | $3.47 | $0.44 | 12m40s | 42m28s |
| EMB | $3.07 | $0.14 | 12m21s | 17m21s |
| Finance Agent (v2) | $1.91 | $0.12 | 4m46s | 14m58s |
| Tax Agent Bench | $2.79 | $0.19 | 40m15s | 33m16s |
| MedCode | N/A | N/A | 36.99s | 108.77s |
| MedScribe | N/A | N/A | 38.24s | 2m50s |
| ProofBench v1.1 | $1.65 | $0.04 | 34m31s | 7m31s |
| BioMysteryBench | $1.06 | $0.05 | 4m55s | 8m44s |
| Terminal-Bench Science | $21.30 | $0.24 | 4h49m | 1h16m |
| SAGE | N/A | N/A | 47.30s | 91.07s |
| Code Migration | $13.87 | $0.60 | 4h18m | 50m23s |
| IOI | $14.17 | $0.20 | 4h18m | 35m47s |
| ProgramBench | $70.48 | $0.18 | 5h42m | 28m55s |
| Terminal-Bench 4.0 | $12.02 | $0.35 | 3h09m | 32m46s |
| Vibe Code Bench v1.1 | $10.01 | $1.35 | 16m39s | 37m00s |
| CyberBench v1.1 | $2.13 | $0.13 | 30m44s | 15m50s |
| Public Benefits Bench v1.1 | $0.91 | $0.22 | 7m19s | 52m59s |
Results available only for Kimi K3
- Vals RSI Index
- LegalBench
- MortgageTax
- TaxEval v2
- GPQA Diamond
- MMLU Pro
- MMMU Pro
- LiveCodeBench
- SWE-bench
- Vibe Code Bench 1-100
- Time Horizon Index: KSP
Results available only for GPT-6 Luna
- MysteryMechanism