DeepSeek V4.1 Flash vs GPT-6 Luna: Benchmark Comparison
DeepSeek V4.1 Flash has the higher score on 12 of 20 shared benchmarks; GPT-6 Luna leads on 7.
The largest observed score gap is 15.28 pts on IOI , where GPT-6 Luna leads.
Reported ±1 standard-error ranges overlap on 10 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 | DeepSeek V4.1 Flash | GPT-6 Luna | Gap | Reported uncertainty |
|---|---|---|---|---|
| Vals Index | 51.32% ±1.13 | 51.22% ±1.07 | 0.10 pts | Reported ±1 SE ranges overlap |
| Harvey's Legal Agent Benchmark | 6.67% ±1.83 | 2.92% ±1.36 | 3.75 pts | Reported ±1 SE ranges do not overlap |
| Legal Research Bench | 41.35% ±3.42 | 30.29% ±3.19 | 11.06 pts | Reported ±1 SE ranges do not overlap |
| EMB | 57.21% ±3.23 | 68.52% ±2.81 | 11.31 pts | Reported ±1 SE ranges do not overlap |
| Finance Agent (v2) | 53.48% ±0.39 | 49.87% ±0.23 | 3.61 pts | Reported ±1 SE ranges do not overlap |
| Tax Agent Bench | 62.46% ±3.15 | 58.86% ±3.21 | 3.59 pts | Reported ±1 SE ranges overlap |
| MedCode | 41.17% ±2.04 | 44.69% ±2.30 | 3.51 pts | Reported ±1 SE ranges overlap |
| MedScribe | 85.50% ±1.92 | 83.71% ±1.95 | 1.79 pts | Reported ±1 SE ranges overlap |
| ProofBench v1.1 | 54.00% ±5.01 | 64.00% ±4.82 | 10.00 pts | Reported ±1 SE ranges do not overlap |
| BioMysteryBench | 67.78% ±1.11 | 61.48% ±2.59 | 6.30 pts | Reported ±1 SE ranges do not overlap |
| MysteryMechanism | 21.17% ±2.75 | 19.37% ±2.66 | 1.80 pts | Reported ±1 SE ranges overlap |
| Terminal-Bench Science | 0.00% ±0.00 | 4.29% ±2.44 | 4.29 pts | Reported ±1 SE ranges do not overlap |
| SAGE | 47.88% ±3.44 | 48.09% ±3.38 | 0.21 pts | Reported ±1 SE ranges overlap |
| Code Migration | 45.62% ±4.29 | 42.55% ±4.42 | 3.07 pts | Reported ±1 SE ranges overlap |
| IOI | 40.28% ±2.56 | 55.56% ±8.87 | 15.28 pts | Reported ±1 SE ranges do not overlap |
| ProgramBench | 0.50% ±0.50 | 0.50% ±0.50 | 0.00 pts | Reported ±1 SE ranges overlap |
| Terminal-Bench 4.0 | 19.70% ±1.75 | 13.64% ±1.51 | 6.06 pts | Reported ±1 SE ranges do not overlap |
| Vibe Code Bench v1.1 | 84.74% ±2.89 | 81.65% ±3.38 | 3.09 pts | Reported ±1 SE ranges overlap |
| CyberBench v1.1 | 73.69% ±5.48 | 76.25% ±5.29 | 2.56 pts | Reported ±1 SE ranges overlap |
| Public Benefits Bench v1.1 | 64.28% ±1.25 | 57.65% ±1.28 | 6.63 pts | Reported ±1 SE ranges do not overlap |
Performance by category
| Category | DeepSeek V4.1 Flash average | GPT-6 Luna average |
|---|---|---|
| Legal | 24.01% | 16.60% |
| Finance | 57.72% | 59.08% |
| Healthcare | 63.34% | 64.20% |
| Math | 54.00% | 64.00% |
| Science | 29.65% | 28.38% |
| Education | 47.88% | 48.09% |
| Coding | 38.17% | 38.78% |
| Cyber | 73.69% | 76.25% |
| Social Mobility | 64.28% | 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 | DeepSeek V4.1 Flash cost | GPT-6 Luna cost | DeepSeek V4.1 Flash latency | GPT-6 Luna latency |
|---|---|---|---|---|
| Vals Index | $0.33 | $0.43 | 27m53s | 30m34s |
| Harvey's Legal Agent Benchmark | $0.17 | $0.30 | 9m39s | 17m32s |
| Legal Research Bench | $0.25 | $0.44 | 11m42s | 42m28s |
| EMB | $0.23 | $0.14 | 13m00s | 17m21s |
| Finance Agent (v2) | $0.21 | $0.12 | 6m04s | 14m58s |
| Tax Agent Bench | $0.13 | $0.19 | 5m49s | 33m16s |
| MedCode | N/A | N/A | 35.13s | 108.77s |
| MedScribe | N/A | N/A | 53.83s | 2m50s |
| ProofBench v1.1 | $0.13 | $0.04 | 9m07s | 7m31s |
| BioMysteryBench | $0.23 | $0.05 | 14m50s | 8m44s |
| MysteryMechanism | $0.16 | $0.03 | 8m04s | 6m01s |
| Terminal-Bench Science | $0.47 | $0.24 | 2h57m | 1h16m |
| SAGE | N/A | N/A | 35.78s | 91.07s |
| Code Migration | $0.94 | $0.60 | 1h45m | 50m23s |
| IOI | $0.24 | $0.20 | 18m30s | 35m47s |
| ProgramBench | $0.90 | $0.18 | 1h02m | 28m55s |
| Terminal-Bench 4.0 | $0.50 | $0.35 | 48m22s | 32m46s |
| Vibe Code Bench v1.1 | $0.41 | $1.35 | 15m28s | 37m00s |
| CyberBench v1.1 | $0.07 | $0.13 | 13m50s | 15m50s |
| Public Benefits Bench v1.1 | $0.07 | $0.22 | 9m59s | 52m59s |
Results available only for DeepSeek V4.1 Flash
- LegalBench
- SkillsBench
- Vibe Code Bench 1-100
- SRE Bench
Results available only for GPT-6 Luna
None.