# Claude Fable 5.2 vs Spark-X2.6-4B

> Side-by-side benchmark comparison for Claude Fable 5.2 and Spark-X2.6-4B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-fable-5-2-vs-spark-x2-6-4b
- Last updated: November 9, 2026

- Shared sourced benchmarks: 3
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude Fable 5.2 and Spark-X2.6-4B share only 3 sourced benchmark rows.

## Summary

- Only 3 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Spark-X2.6-4B has the lower published output-token price.

## Model Snapshot

| Property | Claude Fable 5.2 | Spark-X2.6-4B |
|----------|----------|----------|
| Creator | Anthropic | SparkLLM |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Independent public score (not head-to-head) | 91.19 | 40.35 |
| Benchmarks Covered | 30 | 20 |
| Pricing (input/output) | $8.00 / $40.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Fable 5.2 public-lane score: 90.7 (Estimated · #1/132)
- Spark-X2.6-4B public-lane score: 35.8 (Estimated · #85/132)

| Benchmark | Claude Fable 5.2 | Spark-X2.6-4B | 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 |
| BFCL v4 | Coming soon | 71.8% | Coming soon |
| τ²-bench results | Coming soon | 86.9% | Coming soon |
| MCP Atlas | Coming soon | 62.4% | Coming soon |
| BrowseComp | Coming soon | 53.1% | Coming soon |
| HLE w/ tools | Coming soon | 36.9% | Coming soon |
| τ³-bench results | Coming soon | 34.7% | Coming soon |
| Claw-Eval | Coming soon | 69.9% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Fable 5.2 public-lane score: 86.9 (Estimated · #1/158)
- Spark-X2.6-4B public-lane score: 33.4 (Estimated · #97/158)

| Benchmark | Claude Fable 5.2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 93% | 54.3% | Claude Fable 5.2 |
| SWE Multilingual | 96.6% | 64.7% | Claude Fable 5.2 |
| SWE Multimodal | 74.1% | Coming soon | Coming soon |
| 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% | Coming soon | Coming soon |
| CursorBench 4.0 | 60.0% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 62.8% | Coming soon |
| SciCode | Coming soon | 36.8% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Fable 5.2 public-lane score: 90.7 (Supported · #1/157)
- Spark-X2.6-4B public-lane score: Coming soon

| Benchmark | Claude Fable 5.2 | Spark-X2.6-4B | 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 |
| LongBench v2 | Coming soon | 53.3% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Claude Fable 5.2 public-lane score: 89.8 (Estimated · #1/67)
- Spark-X2.6-4B public-lane score: Coming soon

| Benchmark | Claude Fable 5.2 | Spark-X2.6-4B | 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: Insufficient shared evidence
- Claude Fable 5.2 public-lane score: 97.6 (Supported · #1/179)
- Spark-X2.6-4B public-lane score: 43 (Estimated · #105/179)

| Benchmark | Claude Fable 5.2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| HLE | 74.2% | Coming soon | Coming soon |
| HLE w/o tools | 73.2% | 17.9% | Claude Fable 5.2 |
| PhysicianBench | 64.4% | Coming soon | Coming soon |
| GPQA-D | Coming soon | 77.1% | Coming soon |
| GPQA | Coming soon | 69.9% | Coming soon |

### Multilingual

- Winner: Insufficient shared evidence
- Claude Fable 5.2 public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: Coming soon

| Benchmark | Claude Fable 5.2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| GMMLU | 96.0% | Coming soon | Coming soon |
| MILU | 94.1% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Claude Fable 5.2 public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: 78.2 (#66/157)

| Benchmark | Claude Fable 5.2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 93.6% | Coming soon |
| IFBench | Coming soon | 75.8% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Claude Fable 5.2 public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: 60.9 (Unranked · 3 rankable rows)

| Benchmark | Claude Fable 5.2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | Coming soon | 91.2% | Coming soon |
| HMMT Feb 2026 | Coming soon | 81.3% | Coming soon |
| IMOAnswerBench | Coming soon | 75.2% | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude Fable 5.2 and Spark-X2.6-4B?

Not yet. The models share only 3 sourced benchmark rows, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Claude Fable 5.2 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-fable-5-2)
- [Spark-X2.6-4B vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-spark-x2-6-4b)
- [Claude Fable 5.2 vs Claude Fable 5](/compare/claude-fable-vs-claude-fable-5-2)
- [Spark-X2.6-4B vs Claude Fable 5](/compare/claude-fable-vs-spark-x2-6-4b)

## Explore More

- [Claude Fable 5.2 profile](/models/claude-fable-5-2)
- [Spark-X2.6-4B profile](/models/spark-x2-6-4b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)