# Inkling 2 Small vs Spark-X2.6-4B

> Side-by-side benchmark comparison for Inkling 2 Small and Spark-X2.6-4B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/inkling-2-small-vs-spark-x2-6-4b
- Last updated: November 7, 2026

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

## Quick Verdict

Inkling 2 Small leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Inkling 2 Small has the higher overall point estimate 59.06 to 40.48. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in reasoning, where the averages are 86.1 for Inkling 2 Small and 46.6 for Spark-X2.6-4B.
- The biggest single benchmark swing is BrowseComp in Agentic, with scores of 90.2% and 53.1%.
- Spark-X2.6-4B is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Inkling 2 Small | Spark-X2.6-4B |
|----------|----------|----------|
| Creator | Thinking Machines Lab | SparkLLM |
| Type | Proprietary | Open Weight |
| Reasoning | Hybrid | Reasoning |
| Context | 1M | 1M |
| Overall Score | 59.06 | 40.48 |
| Benchmarks Covered | 25 | 20 |
| Pricing (input/output) | $0.30 / $1.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Inkling 2 Small public-lane score: 59.9 (Supported · #26/131)
- Spark-X2.6-4B public-lane score: 35.6 (Estimated · #83/131)

| Benchmark | Inkling 2 Small | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 85.1% | Coming soon | Coming soon |
| BrowseComp | 90.2% | 53.1% | Inkling 2 Small |
| DeepSearchQA | 90.9% | Coming soon | Coming soon |
| MCP Atlas | 85% | 62.4% | Inkling 2 Small |
| JobBench | 70.5% | Coming soon | Coming soon |
| BFCL v4 | Coming soon | 71.8% | Coming soon |
| τ²-bench results | Coming soon | 86.9% | 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: Directional only
- Inkling 2 Small public-lane score: 59.7 (Supported · #20/157)
- Spark-X2.6-4B public-lane score: 33.2 (Estimated · #96/157)

| Benchmark | Inkling 2 Small | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 82.2% | 62.8% | Inkling 2 Small |
| SWE Multilingual | 81.2% | 64.7% | Inkling 2 Small |
| sweMarathon | 38.8% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 85.1% | Coming soon | Coming soon |
| DeepSWE | 72.1% | Coming soon | Coming soon |
| PostTrainBench v1.2 | 31.9% | Coming soon | Coming soon |
| SWE-bench Pro | Coming soon | 54.3% | Coming soon |
| SciCode | Coming soon | 36.8% | Coming soon |

### Reasoning

- Winner: Not comparable
- Inkling 2 Small public-lane score: 86.1 (Unranked · 2 rankable rows)
- Spark-X2.6-4B public-lane score: 46.6 (Unranked · 2 rankable rows)

| Benchmark | Inkling 2 Small | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | 70.6% | 53.3% | Inkling 2 Small |

### Multimodal & Grounded

- Winner: Not comparable
- Inkling 2 Small public-lane score: 86.6 (#12/59)
- Spark-X2.6-4B public-lane score: Coming soon

| Benchmark | Inkling 2 Small | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | 87.7% | Coming soon | Coming soon |
| CharXiv w/o tools | 85.6% | Coming soon | Coming soon |
| Chartography (no tools) | 36.7% | Coming soon | Coming soon |
| Chartography (tools) | 80.4% | Coming soon | Coming soon |
| BabyVision | 68.6% | Coming soon | Coming soon |
| BabyVision w/ Python | 93.7% | Coming soon | Coming soon |
| ScreenSpot Pro | 83.8% | Coming soon | Coming soon |
| PerceptionBench | 64.7% | Coming soon | Coming soon |
| MathVision | 92.8% | Coming soon | Coming soon |

### Knowledge

- Winner: Directional only
- Inkling 2 Small public-lane score: 60.4 (Estimated · #46/178)
- Spark-X2.6-4B public-lane score: 43.7 (Estimated · #104/178)

| Benchmark | Inkling 2 Small | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 93% | 69.9% | Inkling 2 Small |
| GPQA-D | 93.0% | 77.1% | Inkling 2 Small |
| HLE w/o tools | Coming soon | 17.9% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Inkling 2 Small public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: 78.2 (#66/157)

| Benchmark | Inkling 2 Small | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 93.6% | Coming soon |
| IFBench | Coming soon | 75.8% | Coming soon |

### Mathematics

- Winner: Not comparable
- Inkling 2 Small public-lane score: 85.9 (Unranked · 2 rankable rows)
- Spark-X2.6-4B public-lane score: 60.9 (Unranked · 3 rankable rows)

| Benchmark | Inkling 2 Small | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| HMMT Feb 2026 | 95.8% | 81.3% | Inkling 2 Small |
| Apex | 63.5% | Coming soon | Coming soon |
| AIME26 | Coming soon | 91.2% | Coming soon |
| IMOAnswerBench | Coming soon | 75.2% | Coming soon |

## FAQ

### Which is better overall, Inkling 2 Small or Spark-X2.6-4B?

Inkling 2 Small has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Inkling 2 Small and Spark-X2.6-4B?

The widest category gap is in reasoning, where the averages are 86.1 for Inkling 2 Small and 46.6 for Spark-X2.6-4B.

### How many benchmarks does Inkling 2 Small cover on BenchLM?

Inkling 2 Small currently has 25 sourced benchmark scores on BenchLM.

### How many benchmarks does Spark-X2.6-4B cover on BenchLM?

Spark-X2.6-4B currently has 20 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Inkling 2 Small vs Inkling-Small](/compare/inkling-2-small-vs-inkling-small)
- [Spark-X2.6-4B vs Inkling-Small](/compare/inkling-small-vs-spark-x2-6-4b)
- [Inkling 2 Small vs Inkling](/compare/inkling-vs-inkling-2-small)
- [Spark-X2.6-4B vs Inkling](/compare/inkling-vs-spark-x2-6-4b)

## Explore More

- [Inkling 2 Small profile](/models/inkling-2-small)
- [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)