# GPT-5.2 vs Spark-X2.6-4B

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

- Canonical page: https://benchlm.ai/compare/gpt-5-2-vs-spark-x2-6-4b
- Last updated: October 20, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

GPT-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

- GPT-5.2 has the higher overall point estimate 59.86 to 40.14. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in knowledge, where the averages are 59.8 for GPT-5.2 and 43 for Spark-X2.6-4B.
- The biggest single benchmark swing is GPQA in Knowledge, with scores of 92.4% and 69.9%.
- Spark-X2.6-4B is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Spark-X2.6-4B also has the larger context window at 1M.

## Model Snapshot

| Property | GPT-5.2 | Spark-X2.6-4B |
|----------|----------|----------|
| Creator | OpenAI | SparkLLM |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 400K | 1M |
| Overall Score | 59.86 | 40.14 |
| Benchmarks Covered | 31 | 20 |
| Pricing (input/output) | $1.75 / $14.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- GPT-5.2 public-lane score: 44.6 (Supported · #60/131)
- Spark-X2.6-4B public-lane score: 33 (Estimated · #89/131)

| Benchmark | GPT-5.2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | 65.8% | 53.1% | GPT-5.2 |
| OSWorld-Verified | 47.3% | Coming soon | Coming soon |
| Gert Labs | 46.54% | Coming soon | Coming soon |
| JobBench | 34.3% | 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 |
| 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
- GPT-5.2 public-lane score: 36.9 (Supported · #75/152)
- Spark-X2.6-4B public-lane score: 30.6 (Estimated · #95/152)

| Benchmark | GPT-5.2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 80% | 62.8% | GPT-5.2 |
| SWE-bench Pro | 55.6% | 54.3% | GPT-5.2 |
| Vibe Code Bench | 53.50% | Coming soon | Coming soon |
| SWE Multilingual | Coming soon | 64.7% | Coming soon |
| SciCode | Coming soon | 36.8% | Coming soon |

### Reasoning

- Winner: Not comparable
- GPT-5.2 public-lane score: 64.3 (Unranked · 4 rankable rows)
- Spark-X2.6-4B public-lane score: 48.8 (Unranked · 2 rankable rows)

| Benchmark | GPT-5.2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 52.9% | Coming soon | Coming soon |
| ARC-AGI-1 | 86.17% | Coming soon | Coming soon |
| LongBench v2 | Coming soon | 53.3% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- GPT-5.2 public-lane score: 75.9 (#22/55)
- Spark-X2.6-4B public-lane score: Coming soon

| Benchmark | GPT-5.2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| MMMU | 86.7% | Coming soon | Coming soon |
| MMMU-Pro | 79.5% | Coming soon | Coming soon |
| RealWorldQA | 83.3% | Coming soon | Coming soon |
| OmniDocBench 1.5 | 85.7% | Coming soon | Coming soon |
| Video-MME (with subtitle) | 86.0% | Coming soon | Coming soon |
| Video-MME (w/o subtitle) | 85.8% | Coming soon | Coming soon |
| MathVision | 83.0% | Coming soon | Coming soon |
| We-Math | 79.0% | Coming soon | Coming soon |
| DynaMath | 86.8% | Coming soon | Coming soon |
| SimpleVQA | 55.8% | Coming soon | Coming soon |
| CC-OCR | 70.3% | Coming soon | Coming soon |
| AI2D_TEST | 92.2% | Coming soon | Coming soon |
| CountBench | 91.9% | Coming soon | Coming soon |
| ERQA | 59.8% | Coming soon | Coming soon |
| VideoMMMU | 85.9% | Coming soon | Coming soon |
| MLVU (M-Avg) | 85.6% | Coming soon | Coming soon |
| CharXiv | 82.1% | Coming soon | Coming soon |
| V* | 75.9% | Coming soon | Coming soon |

### Knowledge

- Winner: Directional only
- GPT-5.2 public-lane score: 59.8 (Supported · #51/187)
- Spark-X2.6-4B public-lane score: 43 (Estimated · #109/187)

| Benchmark | GPT-5.2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.4% | 69.9% | GPT-5.2 |
| GPQA-D | Coming soon | 77.1% | Coming soon |
| HLE w/o tools | Coming soon | 17.9% | Coming soon |

### Instruction Following

- Winner: Directional only
- GPT-5.2 public-lane score: 92.6 (#19/149)
- Spark-X2.6-4B public-lane score: 78.2 (#62/149)

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

### Mathematics

- Winner: Not comparable
- GPT-5.2 public-lane score: 71.1 (Unranked · 3 rankable rows)
- Spark-X2.6-4B public-lane score: 76.4 (Unranked · 3 rankable rows)

| Benchmark | GPT-5.2 | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | 100% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 67.400% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 31.700% | Coming soon | Coming soon |
| 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, GPT-5.2 or Spark-X2.6-4B?

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

### Where is the biggest gap between GPT-5.2 and Spark-X2.6-4B?

The widest category gap is in knowledge, where the averages are 59.8 for GPT-5.2 and 43 for Spark-X2.6-4B.

### How many benchmarks does GPT-5.2 cover on BenchLM?

GPT-5.2 currently has 31 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

- [GPT-5.2 vs GPT-5.2 Pro](/compare/gpt-5-2-vs-gpt-5-2-pro)
- [Spark-X2.6-4B vs GPT-5.2 Pro](/compare/gpt-5-2-pro-vs-spark-x2-6-4b)
- [GPT-5.2 vs GPT-5.2 Instant](/compare/gpt-5-2-vs-gpt-5-2-instant)
- [Spark-X2.6-4B vs GPT-5.2 Instant](/compare/gpt-5-2-instant-vs-spark-x2-6-4b)

## Explore More

- [GPT-5.2 profile](/models/gpt-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)