Claude Sonnet 5.5 vs GPT-6 Sol: Benchmark Comparison
Claude Sonnet 5.5 has the higher score on 19 of 21 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 4 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 | Claude Sonnet 5.5 | GPT-6 Sol | Gap | Reported uncertainty |
|---|---|---|---|---|
| Vals Index | 67.04% ±0.92 | 57.54% ±1.01 | 9.50 pts | Reported ±1 SE ranges do not overlap |
| Harvey's Legal Agent Benchmark | 2.92% ±1.36 | 1.67% ±0.82 | 1.25 pts | Reported ±1 SE ranges overlap |
| Legal Research Bench | 48.08% ±3.47 | 28.85% ±3.15 | 19.23 pts | Reported ±1 SE ranges do not overlap |
| EMB | 75.71% ±2.44 | 71.53% ±2.35 | 4.18 pts | Reported ±1 SE ranges overlap |
| Finance Agent (v2) | 58.10% ±0.67 | 49.05% ±0.58 | 9.05 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 | 45.71% ±6.00 | 30.00% ±5.52 | 15.71 pts | Reported ±1 SE ranges do not overlap |
| SAGE | 51.77% ±3.41 | 44.79% ±3.36 | 6.98 pts | Reported ±1 SE ranges do not overlap |
| Code Migration | 69.83% ±4.26 | 57.20% ±4.21 | 12.63 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 | 25.50% | 15.26% |
| Finance | 58.59% | 45.19% |
| Healthcare | 72.01% | 64.55% |
| Math | 100.00% | 83.00% |
| Science | 58.64% | 45.00% |
| Education | 51.77% | 44.79% |
| Coding | 63.18% | 54.81% |
| 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 Index | $21.34 | $7.58 | 1h18m | 29m11s |
| Harvey's Legal Agent Benchmark | $16.61 | $3.36 | 57m44s | 13m40s |
| Legal Research Bench | $14.83 | $4.90 | 1h33m | 24m09s |
| EMB | $8.79 | $1.28 | 36m45s | 10m22s |
| Finance Agent (v2) | $6.55 | $2.12 | 31m43s | 9m00s |
| Tax Agent Bench | $9.25 | $2.28 | 59m21s | 17m32s |
| MedCode | N/A | N/A | 3m59s | 62.71s |
| MedScribe | N/A | N/A | 5m07s | 81.14s |
| ProofBench v1.1 | $0.56 | $0.48 | 5m48s | 5m05s |
| BioMysteryBench | $3.74 | $0.66 | 18m06s | 5m24s |
| MysteryMechanism | $3.45 | $0.46 | 23m30s | 6m13s |
| Terminal-Bench Science | $30.43 | $5.82 | 2h39m | 1h22m |
| SAGE | N/A | N/A | 113.42s | 31.42s |
| Code Migration | $75.83 | $15.68 | 3h20m | 1h26m |
| IOI | $7.52 | $2.70 | 45m51s | 30m38s |
| ProgramBench | $35.86 | $11.67 | 2h07m | 46m11s |
| Terminal-Bench 4.0 | $16.51 | $5.79 | 1h22m | 34m56s |
| Vibe Code Bench v1.1 | $31.25 | $26.36 | 1h01m | 38m56s |
| CyberBench v1.1 | $4.42 | $1.34 | 33m53s | 12m14s |
| SRE Bench | $26.52 | $20.65 | 1h55m | 1h03m |
| Public Benefits Bench v1.1 | $4.25 | $2.49 | 1h15m | 31m02s |
Results available only for Claude Sonnet 5.5
None.
Results available only for GPT-6 Sol
- Vals RSI Index