Claude Fable 5.1 vs GPT-6 Sol: Benchmark Comparison
Claude Fable 5.1 has the higher score on 18 of 20 shared benchmarks; GPT-6 Sol leads on 2.
The largest observed score gap is 26.44 pts on Legal Research Bench , where Claude Fable 5.1 leads.
Reported ±1 standard-error ranges overlap on 6 of 19 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 Fable 5.1 | GPT-6 Sol | Gap | Reported uncertainty |
|---|---|---|---|---|
| Vals Index | 65.83% ±1.11 | 57.54% ±1.01 | 8.29 pts | Reported ±1 SE ranges do not overlap |
| Vals RSI Index | 36.09% | 28.11% | 7.98 pts | Uncertainty comparison unavailable |
| Harvey's Legal Agent Benchmark | 6.67% ±1.17 | 1.67% ±0.82 | 5.00 pts | Reported ±1 SE ranges do not overlap |
| Legal Research Bench | 55.29% ±3.46 | 28.85% ±3.15 | 26.44 pts | Reported ±1 SE ranges do not overlap |
| EMB | 76.67% ±2.08 | 71.53% ±2.35 | 5.14 pts | Reported ±1 SE ranges do not overlap |
| Finance Agent (v2) | 58.88% ±2.06 | 49.05% ±0.58 | 9.83 pts | Reported ±1 SE ranges do not overlap |
| Tax Agent Bench | 77.64% ±2.83 | 53.05% ±3.29 | 24.60 pts | Reported ±1 SE ranges do not overlap |
| MedCode | 53.51% ±2.17 | 47.07% ±2.12 | 6.44 pts | Reported ±1 SE ranges do not overlap |
| MedScribe | 91.29% ±1.95 | 82.03% ±1.94 | 9.26 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 |
| MysteryMechanism | 47.75% ±3.36 | 30.18% ±3.09 | 17.57 pts | Reported ±1 SE ranges do not overlap |
| Terminal-Bench Science | 40.00% ±5.90 | 30.00% ±5.52 | 10.00 pts | Reported ±1 SE ranges overlap |
| SAGE | 48.53% ±3.34 | 44.79% ±3.36 | 3.73 pts | Reported ±1 SE ranges overlap |
| Code Migration | 54.61% ±4.81 | 57.20% ±4.21 | 2.59 pts | Reported ±1 SE ranges overlap |
| IOI | 90.78% ±4.65 | 82.61% ±9.24 | 8.17 pts | Reported ±1 SE ranges overlap |
| ProgramBench | 7.00% ±1.81 | 2.00% ±0.99 | 5.00 pts | Reported ±1 SE ranges do not overlap |
| Terminal-Bench 4.0 | 58.08% ±3.31 | 44.44% ±3.54 | 13.64 pts | Reported ±1 SE ranges do not overlap |
| Vibe Code Bench v1.1 | 90.26% ±1.57 | 87.82% ±2.53 | 2.44 pts | Reported ±1 SE ranges overlap |
| CyberBench v1.1 | 70.42% ±5.43 | 77.98% ±5.11 | 7.56 pts | Reported ±1 SE ranges overlap |
| Public Benefits Bench v1.1 | 74.90% ±1.13 | 56.63% ±1.29 | 18.27 pts | Reported ±1 SE ranges do not overlap |
Performance by category
| Category | Claude Fable 5.1 average | GPT-6 Sol average |
|---|---|---|
| Legal | 30.98% | 15.26% |
| Finance | 71.06% | 57.88% |
| Healthcare | 72.40% | 64.55% |
| Math | 100.00% | 83.00% |
| Science | 43.87% | 30.09% |
| Education | 48.53% | 44.79% |
| Coding | 60.15% | 54.81% |
| Cyber | 70.42% | 77.98% |
| Social Mobility | 74.90% | 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 Fable 5.1 cost | GPT-6 Sol cost | Claude Fable 5.1 latency | GPT-6 Sol latency |
|---|---|---|---|---|
| Vals Index | $28.71 | $7.58 | 1h17m | 29m11s |
| Vals RSI Index | $298.22 | $665.11 | 90h00m | 90h00m |
| Harvey's Legal Agent Benchmark | $46.21 | $3.36 | 1h52m | 13m40s |
| Legal Research Bench | $23.06 | $4.90 | 57m29s | 24m09s |
| EMB | $15.93 | $1.28 | 29m32s | 10m22s |
| Finance Agent (v2) | $8.35 | $2.12 | 18m14s | 9m00s |
| Tax Agent Bench | $13.18 | $2.28 | 28m34s | 17m32s |
| MedCode | N/A | N/A | 3m35s | 62.71s |
| MedScribe | N/A | N/A | 3m08s | 81.14s |
| ProofBench v1.1 | $2.70 | $0.48 | 7m58s | 5m05s |
| MysteryMechanism | $5.63 | $0.46 | 17m41s | 6m13s |
| Terminal-Bench Science | $38.01 | $5.82 | 2h36m | 1h22m |
| SAGE | N/A | N/A | 105.75s | 31.42s |
| Code Migration | $70.97 | $15.68 | 4h20m | 1h26m |
| IOI | $11.20 | $2.70 | 30m06s | 30m38s |
| ProgramBench | $58.52 | $11.67 | 2h27m | 46m11s |
| Terminal-Bench 4.0 | $17.18 | $5.79 | 1h00m | 34m56s |
| Vibe Code Bench v1.1 | $33.37 | $26.36 | 57m40s | 38m56s |
| CyberBench v1.1 | $4.01 | $1.34 | 18m32s | 12m14s |
| Public Benefits Bench v1.1 | $7.48 | $2.49 | 48m02s | 31m02s |
Results available only for Claude Fable 5.1
- LegalBench
- MortgageTax
- TaxEval v2
- GPQA Diamond
- MMLU Pro
- MMMU Pro
- LiveCodeBench
- SkillsBench
- Vibe Code Bench 1-100
- SRE Bench
- CUA-bench
- Time Horizon Index: KSP
Results available only for GPT-6 Sol
- BioMysteryBench