# Claude Fable 5.2 vs Claude Opus 4.8

> Side-by-side benchmark comparison for Claude Fable 5.2 and Claude Opus 4.8 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-fable-5-2-vs-claude-opus-4-8
- Last updated: November 9, 2026

- Shared sourced benchmarks: 8
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Claude Fable 5.2 leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Claude Fable 5.2 has the higher overall point estimate 91.19 to 69.18. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in agentic, where the averages are 90.7 for Claude Fable 5.2 and 59.5 for Claude Opus 4.8.
- The biggest single benchmark swing is ARC-AGI-3 in Reasoning, with scores of 65.7% and 1.5%.
- Claude Opus 4.8 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Claude Fable 5.2 | Claude Opus 4.8 |
|----------|----------|----------|
| Creator | Anthropic | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 91.19 | 69.18 |
| Benchmarks Covered | 30 | 45 |
| Pricing (input/output) | $8.00 / $40.00 | $5.00 / $25.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Claude Fable 5.2 public-lane score: 90.7 (Estimated · #1/132)
- Claude Opus 4.8 public-lane score: 59.5 (Supported · #29/132)

| Benchmark | Claude Fable 5.2 | Claude Opus 4.8 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 67.60% | Coming soon | Coming soon |
| Terminal-Bench-Science 0.1 | 74.6% | Coming soon | Coming soon |
| AutomationBench | 51.4% | Coming soon | Coming soon |
| OSWorld 2.1 Offline | 89.3% | Coming soon | Coming soon |
| WANDR | 82.1% | Coming soon | Coming soon |
| Remote Labor Index | 41.3% | Coming soon | Coming soon |
| RoboDojo Sim | 64.9% | Coming soon | Coming soon |
| DRACO | 87.7% | Coming soon | Coming soon |
| Terminal-Bench 4.1 | Coming soon | 23.60% | Coming soon |
| Terminal-Bench 3.0 | Coming soon | 21.1% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 74.6% | Coming soon |
| BrowseComp | Coming soon | 84.3% | Coming soon |
| DeepSearchQA | Coming soon | 93.1% | Coming soon |
| OSWorld-Verified | Coming soon | 83.4% | Coming soon |
| Finance Agent v2 | Coming soon | 53.9% | Coming soon |
| MCP Atlas | Coming soon | 82.2% | Coming soon |
| Toolathlon | Coming soon | 59.9% | Coming soon |
| Gert Labs | Coming soon | 72.97% | Coming soon |
| ResearchClawBench | Coming soon | 21.1% | Coming soon |
| OSWorld 2.0 | Coming soon | 20.6% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 71.9% | Coming soon |
| MazeBench | Coming soon | 0% | Coming soon |

### Coding

- Winner: Directional only
- Claude Fable 5.2 public-lane score: 86.9 (Estimated · #1/158)
- Claude Opus 4.8 public-lane score: 60.3 (Supported · #19/158)

| Benchmark | Claude Fable 5.2 | Claude Opus 4.8 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 93% | 69.2% | Claude Fable 5.2 |
| SWE Multilingual | 96.6% | 84.4% | Claude Fable 5.2 |
| SWE Multimodal | 74.1% | 38.4% | Claude Fable 5.2 |
| DeepSWE | 74.3% | Coming soon | Coming soon |
| FrontierSWE v2 | 69.9% | Coming soon | Coming soon |
| ProgramBench | 85.6% | Coming soon | Coming soon |
| FrontierCode 2.0 | 49.1% | 14.7% | Claude Fable 5.2 |
| CursorBench 4.0 | 60.0% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 88.6% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 74.6% | Coming soon |
| cursorBench31 | Coming soon | 58.4% | Coming soon |
| CursorBench 3.2 | Coming soon | 62.3% | Coming soon |
| FrontierCode 1.1 Main | Coming soon | 46.5% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 87.8% | Coming soon |
| SWE-bench (Vals) | Coming soon | 88.6% | Coming soon |
| PostTrainBench v1.1 | Coming soon | 32.9% | Coming soon |

### Reasoning

- Winner: Claude Fable 5.2
- Claude Fable 5.2 public-lane score: 90.7 (Supported · #1/157)
- Claude Opus 4.8 public-lane score: 64.9 (Supported · #22/157)

| Benchmark | Claude Fable 5.2 | Claude Opus 4.8 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-3 | 65.7% | 1.5% | Claude Fable 5.2 |
| ARC-AGI-3 Provider Adapter | 94.90% | Coming soon | Coming soon |
| STEM Professor Bench | 61.8% | Coming soon | Coming soon |
| ARC-AGI-2 | Coming soon | 72.1% | Coming soon |
| ARC-AGI-1 | Coming soon | 92.50% | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Claude Fable 5.2 public-lane score: 89.8 (Estimated · #1/67)
- Claude Opus 4.8 public-lane score: 67.4 (Estimated · #18/67)

| Benchmark | Claude Fable 5.2 | Claude Opus 4.8 | Winner |
|-----------|-----------|-----------|--------|
| Chartography (no tools) | 73.4% | Coming soon | Coming soon |
| Chartography (tools) | 91.6% | Coming soon | Coming soon |
| OfficeQA | 83.4% | Coming soon | Coming soon |
| OfficeQA Pro | 72.9% | 66.2% | Claude Fable 5.2 |
| BenchCAD 2.1 | 75.4% | Coming soon | Coming soon |
| BenchCAD 2.1 (tools) | 83.5% | Coming soon | Coming soon |
| ExtractBench (LlamaIndex) | Coming soon | 86.84% | Coming soon |
| ParseBench | Coming soon | 62.27% | Coming soon |
| ScreenSpot Pro | Coming soon | 87.9% | Coming soon |
| CharXiv | Coming soon | 89.9% | Coming soon |
| CharXiv w/o tools | Coming soon | 80.5% | Coming soon |

### Knowledge

- Winner: Claude Fable 5.2
- Claude Fable 5.2 public-lane score: 97.6 (Supported · #1/179)
- Claude Opus 4.8 public-lane score: 69.4 (Supported · #17/179)

| Benchmark | Claude Fable 5.2 | Claude Opus 4.8 | Winner |
|-----------|-----------|-----------|--------|
| HLE | 74.2% | 57.9% | Claude Fable 5.2 |
| HLE w/o tools | 73.2% | 49.8% | Claude Fable 5.2 |
| PhysicianBench | 64.4% | Coming soon | Coming soon |
| GPQA | Coming soon | 93.6% | Coming soon |
| GPQA-D | Coming soon | 93.6% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 92.4% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 89.6% | Coming soon |

### Multilingual

- Winner: Not comparable
- Claude Fable 5.2 public-lane score: Coming soon
- Claude Opus 4.8 public-lane score: Coming soon

| Benchmark | Claude Fable 5.2 | Claude Opus 4.8 | Winner |
|-----------|-----------|-----------|--------|
| GMMLU | 96.0% | Coming soon | Coming soon |
| MILU | 94.1% | Coming soon | Coming soon |
| INCLUDE | Coming soon | 87.6% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Fable 5.2 public-lane score: Coming soon
- Claude Opus 4.8 public-lane score: 75.4 (#70/157)

### Mathematics

- Winner: Not comparable
- Claude Fable 5.2 public-lane score: Coming soon
- Claude Opus 4.8 public-lane score: 80.9 (#1/12)

| Benchmark | Claude Fable 5.2 | Claude Opus 4.8 | Winner |
|-----------|-----------|-----------|--------|
| USAMO 2026 | Coming soon | 96.7% | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 80.000% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 56.098% | Coming soon |

## FAQ

### Which is better overall, Claude Fable 5.2 or Claude Opus 4.8?

Claude Fable 5.2 has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Claude Fable 5.2 and Claude Opus 4.8?

The widest category gap is in agentic, where the averages are 90.7 for Claude Fable 5.2 and 59.5 for Claude Opus 4.8.

### How many benchmarks does Claude Fable 5.2 cover on BenchLM?

Claude Fable 5.2 currently has 30 sourced benchmark scores on BenchLM.

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

Claude Opus 4.8 currently has 45 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Fable 5.2 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-fable-5-2)
- [Claude Opus 4.8 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-opus-4-8)
- [Claude Fable 5.2 vs Claude Fable 5](/compare/claude-fable-vs-claude-fable-5-2)
- [Claude Opus 4.8 vs Claude Fable 5](/compare/claude-fable-vs-claude-opus-4-8)

## Explore More

- [Claude Fable 5.2 profile](/models/claude-fable-5-2)
- [Claude Opus 4.8 profile](/models/claude-opus-4-8)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)