Claude Opus 5.5 vs GPT-6 Sol: Benchmark Comparison
Claude Opus 5.5 has the higher score on 20 of 21 shared benchmarks; GPT-6 Sol leads on 1.
The largest observed score gap is 22.62 pts on CyberBench v1.1 , where GPT-6 Sol leads.
Reported ±1 standard-error ranges overlap on 6 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 | Claude Opus 5.5 | GPT-6 Sol | Gap | Reported uncertainty |
|---|---|---|---|---|
| Vals Index | 66.97% ±0.89 | 57.54% ±1.01 | 9.44 pts | Reported ±1 SE ranges do not overlap |
| Vals RSI Index | 37.31% | 28.11% | 9.20 pts | Uncertainty comparison unavailable |
| Harvey's Legal Agent Benchmark | 3.75% ±1.47 | 1.67% ±0.82 | 2.08 pts | Reported ±1 SE ranges overlap |
| Legal Research Bench | 50.48% ±3.48 | 28.85% ±3.15 | 21.64 pts | Reported ±1 SE ranges do not overlap |
| EMB | 75.94% ±2.38 | 71.53% ±2.35 | 4.41 pts | Reported ±1 SE ranges overlap |
| Finance Agent (v2) | 58.59% ±0.17 | 49.05% ±0.58 | 9.54 pts | Reported ±1 SE ranges do not overlap |
| Tax Agent Bench | 70.50% ±3.15 | 53.05% ±3.29 | 17.45 pts | Reported ±1 SE ranges do not overlap |
| MedCode | 49.80% ±2.27 | 47.07% ±2.12 | 2.72 pts | Reported ±1 SE ranges overlap |
| MedScribe | 91.43% ±1.93 | 82.03% ±1.94 | 9.40 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 | 79.26% ±0.98 | 74.81% ±2.43 | 4.44 pts | Reported ±1 SE ranges do not overlap |
| MysteryMechanism | 49.55% ±3.36 | 30.18% ±3.09 | 19.37 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 |
| SAGE | 45.83% ±3.36 | 44.79% ±3.36 | 1.04 pts | Reported ±1 SE ranges overlap |
| Code Migration | 66.65% ±4.33 | 57.20% ±4.21 | 9.45 pts | Reported ±1 SE ranges do not overlap |
| IOI | 95.06% ±4.94 | 82.61% ±9.24 | 12.44 pts | Reported ±1 SE ranges overlap |
| ProgramBench | 18.50% ±2.75 | 2.00% ±0.99 | 16.50 pts | Reported ±1 SE ranges do not overlap |
| Terminal-Bench 4.0 | 65.15% ±0.00 | 44.44% ±3.54 | 20.71 pts | Reported ±1 SE ranges do not overlap |
| Vibe Code Bench v1.1 | 90.29% ±1.53 | 87.82% ±2.53 | 2.47 pts | Reported ±1 SE ranges overlap |
| CyberBench v1.1 | 55.36% ±5.13 | 77.98% ±5.11 | 22.62 pts | Reported ±1 SE ranges do not overlap |
| Public Benefits Bench v1.1 | 70.64% ±1.19 | 56.63% ±1.29 | 14.00 pts | Reported ±1 SE ranges do not overlap |
Performance by category
| Category | Claude Opus 5.5 average | GPT-6 Sol average |
|---|---|---|
| Legal | 27.12% | 15.26% |
| Finance | 68.34% | 57.88% |
| Healthcare | 70.61% | 64.55% |
| Math | 100.00% | 83.00% |
| Science | 58.65% | 45.00% |
| Education | 45.83% | 44.79% |
| Coding | 67.13% | 54.81% |
| Cyber | 55.36% | 77.98% |
| Social Mobility | 70.64% | 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 Opus 5.5 cost | GPT-6 Sol cost | Claude Opus 5.5 latency | GPT-6 Sol latency |
|---|---|---|---|---|
| Vals Index | $32.14 | $7.58 | 1h19m | 29m11s |
| Vals RSI Index | $411.86 | $665.11 | 90h00m | 90h00m |
| Harvey's Legal Agent Benchmark | $21.38 | $3.36 | 49m00s | 13m40s |
| Legal Research Bench | $25.16 | $4.90 | 1h52m | 24m09s |
| EMB | $11.02 | $1.28 | 35m06s | 10m22s |
| Finance Agent (v2) | $9.22 | $2.12 | 33m08s | 9m00s |
| Tax Agent Bench | $15.09 | $2.28 | 1h07m | 17m32s |
| MedCode | N/A | N/A | 4m07s | 62.71s |
| MedScribe | N/A | N/A | 7m22s | 81.14s |
| ProofBench v1.1 | $0.96 | $0.48 | 5m51s | 5m05s |
| BioMysteryBench | $3.64 | $0.66 | 12m19s | 5m24s |
| MysteryMechanism | $4.62 | $0.46 | 19m38s | 6m13s |
| Terminal-Bench Science | $19.12 | $5.82 | 2h28m | 1h22m |
| SAGE | N/A | N/A | 114.20s | 31.42s |
| Code Migration | $112.97 | $15.68 | 3h19m | 1h26m |
| IOI | $5.26 | $2.70 | 17m15s | 30m38s |
| ProgramBench | $68.05 | $11.67 | 2h24m | 46m11s |
| Terminal-Bench 4.0 | $13.20 | $5.79 | 1h04m | 34m56s |
| Vibe Code Bench v1.1 | $57.92 | $26.36 | 1h36m | 38m56s |
| CyberBench v1.1 | $3.48 | $1.34 | 18m11s | 12m14s |
| Public Benefits Bench v1.1 | $5.95 | $2.49 | 1h20m | 31m02s |
Results available only for Claude Opus 5.5
- Vibe Code Bench 1-100
- SRE Bench
- CUA-bench
- Time Horizon Index: KSP
Results available only for GPT-6 Sol
None.