# Claude Fable 5.2 vs Beam 1.0 501B-A23B NVFP4

> Side-by-side benchmark comparison for Claude Fable 5.2 and Beam 1.0 501B-A23B NVFP4 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-fable-5-2-vs-reflection-beam-nvfp4
- Last updated: November 9, 2026

- Shared sourced benchmarks: 4
- 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 68. Conditional score ranges do not establish rank confidence.
- The biggest single benchmark swing is HLE w/o tools in Knowledge, with scores of 73.2% and 34.8%.
- Beam 1.0 501B-A23B NVFP4 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 | Beam 1.0 501B-A23B NVFP4 |
|----------|----------|----------|
| Creator | Anthropic | Reflection AI |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 91.19 | null |
| Benchmarks Covered | 30 | 19 |
| Pricing (input/output) | $8.00 / $40.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Claude Fable 5.2 public-lane score: 90.7 (Estimated · #1/132)
- Beam 1.0 501B-A23B NVFP4 public-lane score: Coming soon

| Benchmark | Claude Fable 5.2 | Beam 1.0 501B-A23B NVFP4 | 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 |
| τ³-bench results | Coming soon | 35.4% | Coming soon |
| HLE w/ tools | Coming soon | 51.1% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 78.4% | Coming soon |
| MCP Atlas | Coming soon | 80.5% | Coming soon |
| BrowseComp | Coming soon | 75.6% | Coming soon |
| DeepSearchQA | Coming soon | 81.1% | Coming soon |

### Coding

- Winner: Not comparable
- Claude Fable 5.2 public-lane score: 86.9 (Estimated · #1/158)
- Beam 1.0 501B-A23B NVFP4 public-lane score: Coming soon

| Benchmark | Claude Fable 5.2 | Beam 1.0 501B-A23B NVFP4 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 93% | 65.6% | Claude Fable 5.2 |
| SWE Multilingual | 96.6% | 77.5% | Claude Fable 5.2 |
| SWE Multimodal | 74.1% | Coming soon | Coming soon |
| DeepSWE | 74.3% | 42.7% | Claude Fable 5.2 |
| FrontierSWE v2 | 69.9% | Coming soon | Coming soon |
| ProgramBench | 85.6% | Coming soon | Coming soon |
| FrontierCode 2.0 | 49.1% | Coming soon | Coming soon |
| CursorBench 4.0 | 60.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 78.4% | Coming soon |
| SWE-Atlas Codebase QnA | Coming soon | 31.4% | Coming soon |
| SWE-bench Verified | Coming soon | 80.7% | Coming soon |
| SciCode | Coming soon | 46.9% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Fable 5.2 public-lane score: 90.7 (Supported · #1/157)
- Beam 1.0 501B-A23B NVFP4 public-lane score: Coming soon

| Benchmark | Claude Fable 5.2 | Beam 1.0 501B-A23B NVFP4 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-3 | 65.7% | Coming soon | Coming soon |
| ARC-AGI-3 Provider Adapter | 94.90% | Coming soon | Coming soon |
| STEM Professor Bench | 61.8% | Coming soon | Coming soon |
| CritPt | Coming soon | 15.4% | Coming soon |
| LongBench v2 | Coming soon | 67.2% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Fable 5.2 public-lane score: 89.8 (Estimated · #1/67)
- Beam 1.0 501B-A23B NVFP4 public-lane score: Coming soon

| Benchmark | Claude Fable 5.2 | Beam 1.0 501B-A23B NVFP4 | 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% | Coming soon | Coming soon |
| BenchCAD 2.1 | 75.4% | Coming soon | Coming soon |
| BenchCAD 2.1 (tools) | 83.5% | Coming soon | Coming soon |

### Knowledge

- Winner: Not comparable
- Claude Fable 5.2 public-lane score: 97.6 (Supported · #1/179)
- Beam 1.0 501B-A23B NVFP4 public-lane score: Coming soon

| Benchmark | Claude Fable 5.2 | Beam 1.0 501B-A23B NVFP4 | Winner |
|-----------|-----------|-----------|--------|
| HLE | 74.2% | Coming soon | Coming soon |
| HLE w/o tools | 73.2% | 34.8% | Claude Fable 5.2 |
| PhysicianBench | 64.4% | Coming soon | Coming soon |
| GPQA-D | Coming soon | 89.3% | Coming soon |

### Multilingual

- Winner: Not comparable
- Claude Fable 5.2 public-lane score: Coming soon
- Beam 1.0 501B-A23B NVFP4 public-lane score: Coming soon

| Benchmark | Claude Fable 5.2 | Beam 1.0 501B-A23B NVFP4 | Winner |
|-----------|-----------|-----------|--------|
| GMMLU | 96.0% | Coming soon | Coming soon |
| MILU | 94.1% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Fable 5.2 public-lane score: Coming soon
- Beam 1.0 501B-A23B NVFP4 public-lane score: 86.2 (#47/157)

| Benchmark | Claude Fable 5.2 | Beam 1.0 501B-A23B NVFP4 | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 79.2% | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Fable 5.2 public-lane score: Coming soon
- Beam 1.0 501B-A23B NVFP4 public-lane score: 84.4 (Unranked · 1 rankable row)

| Benchmark | Claude Fable 5.2 | Beam 1.0 501B-A23B NVFP4 | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | Coming soon | 97.5% | Coming soon |

## FAQ

### Which is better overall, Claude Fable 5.2 or Beam 1.0 501B-A23B NVFP4?

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

### 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 Beam 1.0 501B-A23B NVFP4 cover on BenchLM?

Beam 1.0 501B-A23B NVFP4 currently has 19 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)
- [Beam 1.0 501B-A23B NVFP4 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-reflection-beam-nvfp4)
- [Claude Fable 5.2 vs Claude Fable 5](/compare/claude-fable-vs-claude-fable-5-2)
- [Beam 1.0 501B-A23B NVFP4 vs Claude Fable 5](/compare/claude-fable-vs-reflection-beam-nvfp4)

## Explore More

- [Claude Fable 5.2 profile](/models/claude-fable-5-2)
- [Beam 1.0 501B-A23B NVFP4 profile](/models/reflection-beam-nvfp4)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)