Claude Opus 4.8 vs Muse Spark 1.3 Max: Benchmark Comparison
Claude Opus 4.8 has the higher score on 1 of 7 shared benchmarks; Muse Spark 1.3 Max leads on 6.
The largest observed score gap is 12.44 pts on Tax Agent Bench , where Muse Spark 1.3 Max leads.
Reported ±1 standard-error ranges overlap on 4 of 6 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 4.8 | Muse Spark 1.3 Max | Gap | Reported uncertainty |
|---|---|---|---|---|
| Vals RSI Index | 23.98% | 19.64% | 4.34 pts | Uncertainty comparison unavailable |
| Legal Research Bench | 43.75% ±3.45 | 55.29% ±3.46 | 11.54 pts | Reported ±1 SE ranges do not overlap |
| Tax Agent Bench | 30.00% ±3.30 | 42.44% ±3.51 | 12.44 pts | Reported ±1 SE ranges do not overlap |
| Terminal-Bench-Science | 4.29% ±2.44 | 10.00% ±3.61 | 5.71 pts | Reported ±1 SE ranges overlap |
| ProgramBench | 1.00% ±0.70 | 2.50% ±1.11 | 1.50 pts | Reported ±1 SE ranges overlap |
| Terminal-Bench 4.0 | 23.23% ±1.34 | 24.75% ±0.51 | 1.52 pts | Reported ±1 SE ranges overlap |
| Vibe Code Bench v1.1 | 82.72% ±3.08 | 85.86% ±2.51 | 3.13 pts | Reported ±1 SE ranges overlap |
Performance by category
| Category | Claude Opus 4.8 average | Muse Spark 1.3 Max average |
|---|---|---|
| Legal | 43.75% | 55.29% |
| Finance | 30.00% | 42.44% |
| Science | 4.29% | 10.00% |
| Coding | 35.65% | 37.70% |
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 4.8 cost | Muse Spark 1.3 Max cost | Claude Opus 4.8 latency | Muse Spark 1.3 Max latency |
|---|---|---|---|---|
| Vals RSI Index | $465.25 | $48.82 | 90h00m | 90h00m |
| Legal Research Bench | $2.82 | $0.59 | 11m54s | 5m17s |
| Tax Agent Bench | $1.69 | $0.39 | 7m59s | 4m09s |
| Terminal-Bench-Science | $23.14 | $6.09 | 1h55m | 1h24m |
| ProgramBench | $31.27 | $54.29 | 1h32m | 5h28m |
| Terminal-Bench 4.0 | $17.14 | $6.65 | 1h11m | 52m56s |
| Vibe Code Bench v1.1 | $26.88 | $2.54 | 1h16m | 16m18s |
Results available only for Claude Opus 4.8
- LegalBench
- MortgageTax
- TaxEval v2
- MedCode
- MedScribe
- GPQA Diamond
- MMLU Pro
- MMMU Pro
- SAGE
- LiveCodeBench
- SkillsBench
- SWE-bench
- Public Benefits Bench v1.1
- Time Horizon Index: KSP
Results available only for Muse Spark 1.3 Max
- ProofBench v1.1
- MysteryMechanism
- IOI
- SWE-bench Multimodal
- Vibe Code Bench 1-100
- CyberBench v1.1
- SRE Bench
- CUA-bench