# Claude Opus 4.8 vs GPT-5.6 Sol

> Side-by-side benchmark comparison for Claude Opus 4.8 and GPT-5.6 Sol across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-4-8-vs-gpt-5-6-sol
- Last updated: September 24, 2026

- Shared sourced benchmarks: 19
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick GPT-5.6 Sol if you want the stronger benchmark profile. Claude Opus 4.8 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GPT-5.6 Sol leads overall 78.49 to 70.46.
- The clearest category separation is in mathematics, where the averages are 65.2 for Claude Opus 4.8 and 96.8 for GPT-5.6 Sol.
- The biggest single benchmark swing is FrontierMath v2 (Tier 4) in Mathematics, with scores of 31.250% and 83.000%.
- GPT-5.6 Sol is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.6 Sol also has the larger context window at 1.05M.

## Model Snapshot

| Property | Claude Opus 4.8 | GPT-5.6 Sol |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1.05M |
| Overall Score | 70.46 | 78.49 |
| Benchmarks Covered | 38 | 37 |
| Pricing (input/output) | $5.00 / $25.00 | $4.00 / $20.00 |

## Category Breakdown

### Agentic

- Winner: GPT-5.6 Sol
- Claude Opus 4.8 public-lane score: 61.3 (Supported · #13/105)
- GPT-5.6 Sol public-lane score: 69.6 (Supported · #7/105)

| Benchmark | Claude Opus 4.8 | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 21.1% | 34.6% | GPT-5.6 Sol |
| Terminal-Bench 2.1 | 74.6% | 91.9% | GPT-5.6 Sol |
| BrowseComp | 84.3% | 92.2% | GPT-5.6 Sol |
| DeepSearchQA | 93.1% | Coming soon | Coming soon |
| OSWorld-Verified | 83.4% | Coming soon | Coming soon |
| Finance Agent v2 | 53.9% | Coming soon | Coming soon |
| MCP Atlas | 82.2% | Coming soon | Coming soon |
| Toolathlon | 59.9% | 58% | Claude Opus 4.8 |
| Gert Labs | 72.97% | Coming soon | Coming soon |
| ResearchClawBench | 21.1% | Coming soon | Coming soon |
| OSWorld 2.0 | 20.6% | 62.6% | GPT-5.6 Sol |
| Terminal-Bench 2.1 (Vals) | 71.9% | 85.8% | GPT-5.6 Sol |
| CyberGym | Coming soon | 84.5% | Coming soon |
| ExploitGym | Coming soon | 33.7% | Coming soon |
| ApprenticeBench | Coming soon | 26% | Coming soon |

### Coding

- Winner: GPT-5.6 Sol
- Claude Opus 4.8 public-lane score: 63.3 (Supported · #12/135)
- GPT-5.6 Sol public-lane score: 71.6 (Supported · #6/135)

| Benchmark | Claude Opus 4.8 | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 88.6% | Coming soon | Coming soon |
| SWE-bench Pro | 69.2% | 64.6% | Claude Opus 4.8 |
| SWE Multilingual | 84.4% | Coming soon | Coming soon |
| SWE Multimodal | 38.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 74.6% | 91.9% | GPT-5.6 Sol |
| cursorBench31 | 58.4% | Coming soon | Coming soon |
| cursorBench32 | 62.3% | 67.2% | GPT-5.6 Sol |
| FrontierCode 1.1 Main | 46.5% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.8% | 82.6% | Claude Opus 4.8 |
| SWE-bench (Vals) | 88.6% | 96.2% | GPT-5.6 Sol |
| Bug Hunt Bench | Coming soon | 42 fixes | Coming soon |
| DeepSWE | Coming soon | 72.7% | Coming soon |
| FrontierCode 1.1 Extended | Coming soon | 60.6% | Coming soon |
| FrontierSWE v2 | Coming soon | 32.2% | Coming soon |
| VulcanBench v3 | Coming soon | 87.0% | Coming soon |
| VulcanBench CII v1 | Coming soon | 86.5% | Coming soon |
| cursorBench40 | Coming soon | 41.7% | Coming soon |

### Reasoning

- Winner: GPT-5.6 Sol
- Claude Opus 4.8 public-lane score: 59 (#15/19)
- GPT-5.6 Sol public-lane score: 72.1 (#8/19)

| Benchmark | Claude Opus 4.8 | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 72.1% | 92.5% | GPT-5.6 Sol |
| ARC-AGI-3 | 1.5% | 7.8% | GPT-5.6 Sol |
| GeneBench-Pro | Coming soon | 28.7% | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Claude Opus 4.8 public-lane score: 87.7 (#4/50)
- GPT-5.6 Sol public-lane score: 87.6 (#5/50)

| Benchmark | Claude Opus 4.8 | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | 66.2% | Coming soon | Coming soon |
| ScreenSpot Pro | 87.9% | Coming soon | Coming soon |
| CharXiv | 89.9% | Coming soon | Coming soon |
| CharXiv w/o tools | 80.5% | Coming soon | Coming soon |
| MMMU-Pro | Coming soon | 83% | Coming soon |
| MMMU-Pro w/ Python | Coming soon | 84.6% | Coming soon |

### Knowledge

- Winner: GPT-5.6 Sol
- Claude Opus 4.8 public-lane score: 70 (Supported · #11/158)
- GPT-5.6 Sol public-lane score: 78.8 (Supported · #7/158)

| Benchmark | Claude Opus 4.8 | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 93.6% | 94.6% | GPT-5.6 Sol |
| GPQA-D | 93.6% | 94.6% | GPT-5.6 Sol |
| HLE | 57.9% | Coming soon | Coming soon |
| HLE w/o tools | 49.8% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 92.4% | 95.2% | GPT-5.6 Sol |
| MMLU-Pro (Vals) | 89.6% | 89.1% | Claude Opus 4.8 |
| HLE-Verified | Coming soon | 54.5% | Coming soon |
| LABBench2 | Coming soon | 82.1% | Coming soon |
| HealthBench Professional | Coming soon | 60.5% | Coming soon |
| HealthBench Hard | Coming soon | 33.1% | Coming soon |

### Multilingual

- Winner: Not comparable
- Claude Opus 4.8 public-lane score: Coming soon
- GPT-5.6 Sol public-lane score: Coming soon

| Benchmark | Claude Opus 4.8 | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| INCLUDE | 87.6% | Coming soon | Coming soon |

### Instruction Following

- Winner: Directional only
- Claude Opus 4.8 public-lane score: 74 (#60/124)
- GPT-5.6 Sol public-lane score: 87.7 (#28/124)

### Mathematics

- Winner: Not comparable
- Claude Opus 4.8 public-lane score: 65.2 (#2/7)
- GPT-5.6 Sol public-lane score: 96.8 (Unranked · 3 rankable rows)

| Benchmark | Claude Opus 4.8 | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| USAMO 2026 | 96.7% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 47.241% | 89.000% | GPT-5.6 Sol |
| FrontierMath v2 (Tier 4) | 31.250% | 83.000% | GPT-5.6 Sol |
| FrontierMath (legacy) | Coming soon | 89% | Coming soon |

## FAQ

### Which is better overall, Claude Opus 4.8 or GPT-5.6 Sol?

GPT-5.6 Sol is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Opus 4.8 and GPT-5.6 Sol?

The widest category gap is in mathematics, where the averages are 65.2 for Claude Opus 4.8 and 96.8 for GPT-5.6 Sol.

### How many benchmarks does Claude Opus 4.8 cover on BenchLM?

Claude Opus 4.8 currently has 38 sourced benchmark scores on BenchLM.

### How many benchmarks does GPT-5.6 Sol cover on BenchLM?

GPT-5.6 Sol currently has 37 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Opus 4.8 vs GPT-5.6 Terra](/compare/claude-opus-4-8-vs-gpt-5-6-terra)
- [GPT-5.6 Sol vs GPT-5.6 Terra](/compare/gpt-5-6-sol-vs-gpt-5-6-terra)
- [Claude Opus 4.8 vs GPT-5.6 Luna](/compare/claude-opus-4-8-vs-gpt-5-6-luna)
- [GPT-5.6 Sol vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-gpt-5-6-sol)

## Explore More

- [Claude Opus 4.8 profile](/models/claude-opus-4-8)
- [GPT-5.6 Sol profile](/models/gpt-5-6-sol)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)