DeepSeek V4.1 Flash vs GPT-5.6 Terra: Benchmark Comparison
DeepSeek V4.1 Flash has the higher score on 8 of 21 shared benchmarks; GPT-5.6 Terra leads on 11.
The largest observed score gap is 47.33 pts on IOI , where GPT-5.6 Terra leads.
Reported ±1 standard-error ranges overlap on 13 of 21 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-5.6 Terra | Gap | Reported uncertainty |
|---|---|---|---|---|
| Vals Index | 51.32% ±1.13 | 53.09% ±1.29 | 1.77 pts | Reported ±1 SE ranges overlap |
| Harvey's Legal Agent Benchmark | 6.67% ±1.83 | 0.83% ±0.83 | 5.83 pts | Reported ±1 SE ranges do not overlap |
| Legal Research Bench | 41.35% ±3.42 | 41.35% ±3.42 | 0.00 pts | Reported ±1 SE ranges overlap |
| LegalBench | 83.28% ±0.46 | 85.11% ±0.45 | 1.83 pts | Reported ±1 SE ranges do not overlap |
| EMB | 57.21% ±3.23 | 66.20% ±3.11 | 9.00 pts | Reported ±1 SE ranges do not overlap |
| Finance Agent (v2) | 53.48% ±0.39 | 54.44% ±2.07 | 0.95 pts | Reported ±1 SE ranges overlap |
| Tax Agent Bench | 62.46% ±3.15 | 65.20% ±3.19 | 2.74 pts | Reported ±1 SE ranges overlap |
| MedCode | 41.17% ±2.04 | 43.41% ±2.17 | 2.24 pts | Reported ±1 SE ranges overlap |
| MedScribe | 85.50% ±1.92 | 82.87% ±1.95 | 2.63 pts | Reported ±1 SE ranges overlap |
| ProofBench v1.1 | 54.00% ±5.01 | 74.00% ±4.41 | 20.00 pts | Reported ±1 SE ranges do not overlap |
| Terminal-Bench Science | 0.00% ±0.00 | 10.00% ±3.61 | 10.00 pts | Reported ±1 SE ranges do not overlap |
| SAGE | 47.88% ±3.44 | 47.00% ±3.40 | 0.88 pts | Reported ±1 SE ranges overlap |
| Code Migration | 45.62% ±4.29 | 47.80% ±4.28 | 2.18 pts | Reported ±1 SE ranges overlap |
| IOI | 40.28% ±2.56 | 87.61% ±6.53 | 47.33 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 |
| SkillsBench | 69.80% ±3.88 | 58.90% ±4.47 | 10.91 pts | Reported ±1 SE ranges do not overlap |
| Terminal-Bench 4.0 | 19.70% ±1.75 | 22.73% ±2.31 | 3.03 pts | Reported ±1 SE ranges overlap |
| Vibe Code Bench 1-100 | 16.38% ±3.19 | 14.82% ±3.12 | 1.56 pts | Reported ±1 SE ranges overlap |
| Vibe Code Bench v1.1 | 84.74% ±2.89 | 74.59% ±4.20 | 10.15 pts | Reported ±1 SE ranges do not overlap |
| CyberBench v1.1 | 73.69% ±5.48 | 72.08% ±5.41 | 1.61 pts | Reported ±1 SE ranges overlap |
| Public Benefits Bench v1.1 | 64.28% ±1.25 | 62.38% ±1.26 | 1.89 pts | Reported ±1 SE ranges overlap |
Performance by category
| Category | DeepSeek V4.1 Flash average | GPT-5.6 Terra average |
|---|---|---|
| Legal | 43.76% | 42.43% |
| Finance | 57.72% | 61.95% |
| Healthcare | 63.34% | 63.14% |
| Math | 54.00% | 74.00% |
| Science | 0.00% | 10.00% |
| Education | 47.88% | 47.00% |
| Coding | 39.57% | 43.85% |
| Cyber | 73.69% | 72.08% |
| Social Mobility | 64.28% | 62.38% |
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-5.6 Terra cost | DeepSeek V4.1 Flash latency | GPT-5.6 Terra latency |
|---|---|---|---|---|
| Vals Index | $0.33 | $5.78 | 27m53s | 35m39s |
| Harvey's Legal Agent Benchmark | $0.17 | $3.20 | 9m39s | 17m05s |
| Legal Research Bench | $0.25 | $7.91 | 11m42s | 1h10m |
| LegalBench | N/A | N/A | 6.53s | 2.78s |
| EMB | $0.23 | $2.19 | 13m00s | 13m33s |
| Finance Agent (v2) | $0.21 | $3.63 | 6m04s | 24m10s |
| Tax Agent Bench | $0.13 | $4.83 | 5m49s | 1h01m |
| MedCode | N/A | N/A | 35.13s | 18.41s |
| MedScribe | N/A | N/A | 53.83s | 35.53s |
| ProofBench v1.1 | $0.13 | $1.27 | 9m07s | 12m57s |
| Terminal-Bench Science | $0.47 | $5.19 | 2h57m | 2h04m |
| SAGE | N/A | N/A | 35.78s | 40.06s |
| Code Migration | $0.94 | $8.13 | 1h45m | 48m34s |
| IOI | $0.24 | $8.66 | 18m30s | 1h23m |
| ProgramBench | $0.90 | $5.38 | 1h02m | 33m36s |
| SkillsBench | $0.09 | $1.75 | 3m43s | 6m55s |
| Terminal-Bench 4.0 | $0.50 | $5.60 | 48m22s | 31m29s |
| Vibe Code Bench 1-100 | $0.69 | $33.33 | 28m21s | 1h49m |
| Vibe Code Bench v1.1 | $0.41 | $7.89 | 15m28s | 19m12s |
| CyberBench v1.1 | $0.07 | $3.31 | 13m50s | 17m04s |
| Public Benefits Bench v1.1 | $0.07 | $1.20 | 9m59s | 19m31s |
Results available only for DeepSeek V4.1 Flash
- BioMysteryBench
- MysteryMechanism
- SRE Bench
Results available only for GPT-5.6 Terra
- MortgageTax
- TaxEval v2
- GPQA Diamond
- MMLU Pro
- MMMU Pro
- LiveCodeBench
- SWE-bench