Claude Sonnet 5.5 vs GPT-6 Sol: Benchmark Comparison
Claude Sonnet 5.5 has the higher score on 14 of 16 shared benchmarks; GPT-6 Sol leads on 2.
The largest observed score gap is 26.96 pts on Tax Agent Bench , where Claude Sonnet 5.5 leads.
Reported ±1 standard-error ranges overlap on 2 of 16 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 | Claude Sonnet 5.5 | GPT-6 Sol | Gap | Reported uncertainty |
|---|---|---|---|---|
| Vals Science Index | 59.12% ±2.31 | 45.00% ±2.26 | 14.12 pts | Reported ±1 SE ranges do not overlap |
| Legal Research Bench | 48.08% ±3.47 | 28.85% ±3.15 | 19.23 pts | Reported ±1 SE ranges do not overlap |
| Tax Agent Bench | 41.96% ±3.56 | 15.00% ±2.58 | 26.96 pts | Reported ±1 SE ranges do not overlap |
| MedCode | 52.92% ±2.12 | 47.07% ±2.12 | 5.85 pts | Reported ±1 SE ranges do not overlap |
| MedScribe | 91.10% ±1.96 | 82.03% ±1.94 | 9.07 pts | Reported ±1 SE ranges do not overlap |
| ProofBench v1.1 | 100.00% ±0.00 | 83.00% ±3.77 | 17.00 pts | Reported ±1 SE ranges do not overlap |
| BioMysteryBench | 81.11% ±0.64 | 74.81% ±2.43 | 6.30 pts | Reported ±1 SE ranges do not overlap |
| MysteryMechanism | 49.10% ±3.36 | 30.18% ±3.09 | 18.92 pts | Reported ±1 SE ranges do not overlap |
| Terminal-Bench-Science | 47.14% ±6.01 | 30.00% ±5.52 | 17.14 pts | Reported ±1 SE ranges do not overlap |
| IOI | 83.06% ±3.74 | 82.61% ±9.24 | 0.44 pts | Reported ±1 SE ranges overlap |
| ProgramBench | 6.50% ±1.75 | 2.00% ±0.99 | 4.50 pts | Reported ±1 SE ranges do not overlap |
| Terminal-Bench 4.0 | 64.14% ±1.01 | 44.44% ±3.54 | 19.70 pts | Reported ±1 SE ranges do not overlap |
| Vibe Code Bench v1.1 | 92.39% ±1.26 | 87.82% ±2.53 | 4.57 pts | Reported ±1 SE ranges do not overlap |
| CyberBench v1.1 | 59.58% ±5.21 | 77.98% ±5.11 | 18.39 pts | Reported ±1 SE ranges do not overlap |
| SRE Bench | 30.15% ±2.84 | 30.53% ±2.85 | 0.38 pts | Reported ±1 SE ranges overlap |
| Public Benefits Bench v1.1 | 67.19% ±1.22 | 56.63% ±1.29 | 10.55 pts | Reported ±1 SE ranges do not overlap |
Performance by category
| Category | Claude Sonnet 5.5 average | GPT-6 Sol average |
|---|---|---|
| Legal | 48.08% | 28.85% |
| Finance | 41.96% | 15.00% |
| Healthcare | 72.01% | 64.55% |
| Math | 100.00% | 83.00% |
| Science | 59.12% | 45.00% |
| Coding | 61.52% | 54.22% |
| Cyber | 44.87% | 54.25% |
| Social Mobility | 67.19% | 56.63% |
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 | Claude Sonnet 5.5 cost | GPT-6 Sol cost | Claude Sonnet 5.5 latency | GPT-6 Sol latency |
|---|---|---|---|---|
| Vals Science Index | $8.50 | $2.31 | 1h09m | 31m16s |
| Legal Research Bench | $13.66 | $4.90 | 1h33m | 24m09s |
| Tax Agent Bench | $8.73 | $2.28 | 59m21s | 17m32s |
| MedCode | N/A | N/A | 3m59s | 62.71s |
| MedScribe | N/A | N/A | 5m07s | 81.14s |
| ProofBench v1.1 | $0.52 | $0.48 | 5m48s | 5m05s |
| BioMysteryBench | $2.95 | $0.66 | 18m06s | 5m24s |
| MysteryMechanism | $2.98 | $0.46 | 23m30s | 6m13s |
| Terminal-Bench-Science | $19.57 | $5.82 | 2h46m | 1h22m |
| IOI | $5.81 | $2.70 | 45m51s | 30m38s |
| ProgramBench | $22.62 | $11.67 | 2h07m | 46m11s |
| Terminal-Bench 4.0 | $10.75 | $5.79 | 1h22m | 34m56s |
| Vibe Code Bench v1.1 | $19.73 | $26.36 | 1h01m | 38m56s |
| CyberBench v1.1 | $2.91 | $1.34 | 33m53s | 12m14s |
| SRE Bench | $17.27 | $20.65 | 1h55m | 1h03m |
| Public Benefits Bench v1.1 | $3.76 | $2.49 | 1h15m | 31m02s |
Results available only for Claude Sonnet 5.5
- Vals Index
- Vals Finance Index
- Vals Legal Index
- HLAB-Vals-1.1
- Immigration
- ClaimBench
- EMB v1.1
- Finance Agent v2.1
- SAGE
- Code Migration v1.1
- SWE-bench Multimodal
- Access to Justice Benchmark
Results available only for GPT-6 Sol
- Vals RSI Index