# Claude Sonnet 4.5 vs GPT-5.2

> Side-by-side benchmark comparison for Claude Sonnet 4.5 and GPT-5.2 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-sonnet-4-5-vs-gpt-5-2
- Last updated: October 17, 2026

- Shared sourced benchmarks: 9
- 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 47.96. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in reasoning, where the averages are 22.9 for Claude Sonnet 4.5 and 64.3 for GPT-5.2.
- The biggest single benchmark swing is FrontierMath v2 (Tiers 1-3) in Mathematics, with scores of 23.860% and 67.400%.
- GPT-5.2 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.2 also has the larger context window at 400K.

## Model Snapshot

| Property | Claude Sonnet 4.5 | GPT-5.2 |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 400K |
| Overall Score | 47.96 | 59.86 |
| Benchmarks Covered | 12 | 31 |
| Pricing (input/output) | $3.00 / $15.00 | $1.75 / $14.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Claude Sonnet 4.5 public-lane score: 35.1 (Estimated · #81/128)
- GPT-5.2 public-lane score: 44.4 (Supported · #58/128)

| Benchmark | Claude Sonnet 4.5 | GPT-5.2 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 50% | Coming soon | Coming soon |
| OSWorld-Verified | 61.4% | 47.3% | Claude Sonnet 4.5 |
| VITA-Bench | 17.0% | Coming soon | Coming soon |
| Gert Labs | 48.51% | 46.54% | Claude Sonnet 4.5 |
| JobBench | 27.7% | 34.3% | GPT-5.2 |
| BrowseComp | Coming soon | 65.8% | Coming soon |

### Coding

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: Coming soon
- GPT-5.2 public-lane score: 36.8 (Supported · #73/150)

| Benchmark | Claude Sonnet 4.5 | GPT-5.2 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 77.2% | 80% | GPT-5.2 |
| Terminal-Bench 2.0 | 50.0% | Coming soon | Coming soon |
| SWE-bench Pro | Coming soon | 55.6% | Coming soon |
| Vibe Code Bench | Coming soon | 53.50% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: 22.9 (Unranked · 1 rankable row)
- GPT-5.2 public-lane score: 64.3 (Unranked · 4 rankable rows)

| Benchmark | Claude Sonnet 4.5 | GPT-5.2 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 13.6% | 52.9% | GPT-5.2 |
| ARC-AGI-1 | Coming soon | 86.17% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: Coming soon
- GPT-5.2 public-lane score: 75.9 (#22/54)

| Benchmark | Claude Sonnet 4.5 | GPT-5.2 | Winner |
|-----------|-----------|-----------|--------|
| MMMU | Coming soon | 86.7% | Coming soon |
| MMMU-Pro | Coming soon | 79.5% | Coming soon |
| RealWorldQA | Coming soon | 83.3% | Coming soon |
| OmniDocBench 1.5 | Coming soon | 85.7% | Coming soon |
| Video-MME (with subtitle) | Coming soon | 86.0% | Coming soon |
| Video-MME (w/o subtitle) | Coming soon | 85.8% | Coming soon |
| MathVision | Coming soon | 83.0% | Coming soon |
| We-Math | Coming soon | 79.0% | Coming soon |
| DynaMath | Coming soon | 86.8% | Coming soon |
| SimpleVQA | Coming soon | 55.8% | Coming soon |
| CC-OCR | Coming soon | 70.3% | Coming soon |
| AI2D_TEST | Coming soon | 92.2% | Coming soon |
| CountBench | Coming soon | 91.9% | Coming soon |
| ERQA | Coming soon | 59.8% | Coming soon |
| VideoMMMU | Coming soon | 85.9% | Coming soon |
| MLVU (M-Avg) | Coming soon | 85.6% | Coming soon |
| CharXiv | Coming soon | 82.1% | Coming soon |
| V* | Coming soon | 75.9% | Coming soon |

### Knowledge

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: Coming soon
- GPT-5.2 public-lane score: 59.7 (Supported · #50/184)

| Benchmark | Claude Sonnet 4.5 | GPT-5.2 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 83.4% | 92.4% | GPT-5.2 |

### Instruction Following

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: Coming soon
- GPT-5.2 public-lane score: 92.6 (#19/148)

### Mathematics

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: 36.4 (Unranked · 2 rankable rows)
- GPT-5.2 public-lane score: 71.1 (Unranked · 3 rankable rows)

| Benchmark | Claude Sonnet 4.5 | GPT-5.2 | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | 87% | 100% | GPT-5.2 |
| FrontierMath v2 (Tiers 1-3) | 23.860% | 67.400% | GPT-5.2 |
| FrontierMath v2 (Tier 4) | 2.439% | 31.700% | GPT-5.2 |

## FAQ

### Which is better overall, Claude Sonnet 4.5 or GPT-5.2?

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

### Where is the biggest gap between Claude Sonnet 4.5 and GPT-5.2?

The widest category gap is in reasoning, where the averages are 22.9 for Claude Sonnet 4.5 and 64.3 for GPT-5.2.

### How many benchmarks does Claude Sonnet 4.5 cover on BenchLM?

Claude Sonnet 4.5 currently has 12 sourced benchmark scores on BenchLM.

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

GPT-5.2 currently has 31 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Sonnet 4.5 vs Claude Sonnet 4.5 Thinking](/compare/claude-sonnet-4-5-vs-claude-sonnet-4-5-thinking)
- [GPT-5.2 vs Claude Sonnet 4.5 Thinking](/compare/claude-sonnet-4-5-thinking-vs-gpt-5-2)
- [Claude Sonnet 4.5 vs GPT-5.2 Pro](/compare/claude-sonnet-4-5-vs-gpt-5-2-pro)
- [GPT-5.2 vs GPT-5.2 Pro](/compare/gpt-5-2-vs-gpt-5-2-pro)

## Explore More

- [Claude Sonnet 4.5 profile](/models/claude-sonnet-4-5)
- [GPT-5.2 profile](/models/gpt-5-2)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)