# Ornith-1.5-35B-A3B vs Spark-X2.6-4B

> Side-by-side benchmark comparison for Ornith-1.5-35B-A3B and Spark-X2.6-4B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/ornith-1-5-35b-a3b-vs-spark-x2-6-4b
- Last updated: October 20, 2026

- Shared sourced benchmarks: 10
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Spark-X2.6-4B leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Spark-X2.6-4B has the higher overall point estimate 40.14 to 34.11. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in coding, where the averages are 23.6 for Ornith-1.5-35B-A3B and 30.6 for Spark-X2.6-4B.
- The biggest single benchmark swing is GPQA in Knowledge, with scores of 89.2% and 69.9%.
- Spark-X2.6-4B also has the larger context window at 1M.

## Model Snapshot

| Property | Ornith-1.5-35B-A3B | Spark-X2.6-4B |
|----------|----------|----------|
| Creator | Ornith AI | SparkLLM |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 1M |
| Overall Score | 34.11 | 40.14 |
| Benchmarks Covered | 18 | 20 |
| Pricing (input/output) | $0.00 / $0.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Ornith-1.5-35B-A3B public-lane score: 27.1 (Estimated · #104/131)
- Spark-X2.6-4B public-lane score: 33 (Estimated · #89/131)

| Benchmark | Ornith-1.5-35B-A3B | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 67.8% | Coming soon | Coming soon |
| HLE w/ tools | 33.4% | 36.9% | Spark-X2.6-4B |
| MCP Atlas | 70.2% | 62.4% | Ornith-1.5-35B-A3B |
| Toolathlon-Verified | 48.7% | Coming soon | Coming soon |
| WideResearch | 67.8% | Coming soon | Coming soon |
| BrowseComp | 67.6% | 53.1% | Ornith-1.5-35B-A3B |
| Claw-Eval | 72.5% | 69.9% | Ornith-1.5-35B-A3B |
| BFCL v4 | Coming soon | 71.8% | Coming soon |
| τ²-bench results | Coming soon | 86.9% | Coming soon |
| τ³-bench results | Coming soon | 34.7% | Coming soon |

### Coding

- Winner: Directional only
- Ornith-1.5-35B-A3B public-lane score: 23.6 (Estimated · #112/152)
- Spark-X2.6-4B public-lane score: 30.6 (Estimated · #95/152)

| Benchmark | Ornith-1.5-35B-A3B | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 67.8% | Coming soon | Coming soon |
| SWE-bench Verified | 79% | 62.8% | Ornith-1.5-35B-A3B |
| SWE-bench Pro | 59.6% | 54.3% | Ornith-1.5-35B-A3B |
| SWE Multilingual | 71.4% | 64.7% | Ornith-1.5-35B-A3B |
| DeepSWE | 22.0% | Coming soon | Coming soon |
| frontierBench | 5.1% | Coming soon | Coming soon |
| NL2Repo | 46.2% | Coming soon | Coming soon |
| SciCode | Coming soon | 36.8% | Coming soon |

### Reasoning

- Winner: Not comparable
- Ornith-1.5-35B-A3B public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: 48.8 (Unranked · 2 rankable rows)

| Benchmark | Ornith-1.5-35B-A3B | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | Coming soon | 53.3% | Coming soon |

### Knowledge

- Winner: Directional only
- Ornith-1.5-35B-A3B public-lane score: 37.8 (Estimated · #126/187)
- Spark-X2.6-4B public-lane score: 43 (Estimated · #109/187)

| Benchmark | Ornith-1.5-35B-A3B | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 89.2% | 69.9% | Ornith-1.5-35B-A3B |
| GPQA-D | 89.2% | 77.1% | Ornith-1.5-35B-A3B |
| HLE | 25.6% | Coming soon | Coming soon |
| HLE w/o tools | 25.6% | 17.9% | Ornith-1.5-35B-A3B |

### Instruction Following

- Winner: Not comparable
- Ornith-1.5-35B-A3B public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: 78.2 (#62/149)

| Benchmark | Ornith-1.5-35B-A3B | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 93.6% | Coming soon |
| IFBench | Coming soon | 75.8% | Coming soon |

### Mathematics

- Winner: Not comparable
- Ornith-1.5-35B-A3B public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: 76.4 (Unranked · 3 rankable rows)

| Benchmark | Ornith-1.5-35B-A3B | 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

### Which is better overall, Ornith-1.5-35B-A3B or Spark-X2.6-4B?

Spark-X2.6-4B has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Ornith-1.5-35B-A3B and Spark-X2.6-4B?

The widest category gap is in coding, where the averages are 23.6 for Ornith-1.5-35B-A3B and 30.6 for Spark-X2.6-4B.

### How many benchmarks does Ornith-1.5-35B-A3B cover on BenchLM?

Ornith-1.5-35B-A3B currently has 18 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.

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- [Spark-X2.6-4B vs Ornith-1.5-9B](/compare/ornith-1-5-9b-vs-spark-x2-6-4b)

## Explore More

- [Ornith-1.5-35B-A3B profile](/models/ornith-1-5-35b-a3b)
- [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)