# Claude Sonnet 4.5 vs GPT-4o

> Side-by-side benchmark comparison for Claude Sonnet 4.5 and GPT-4o across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-sonnet-4-5-vs-gpt-4o
- Last updated: September 29, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude Sonnet 4.5 and GPT-4o share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- GPT-4o has the lower published output-token price.
- Claude Sonnet 4.5 has the larger published context window at 200K.

## Model Snapshot

| Property | Claude Sonnet 4.5 | GPT-4o |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | 200K | 128K |
| Independent public score (not head-to-head) | 47.85 | 30.74 |
| Benchmarks Covered | 11 | 1 |
| Pricing (input/output) | $3.00 / $15.00 | $2.50 / $10.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Sonnet 4.5 public-lane score: 34.6 (Estimated · #67/117)
- GPT-4o public-lane score: Coming soon

| Benchmark | Claude Sonnet 4.5 | GPT-4o | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 50% | Coming soon | Coming soon |
| OSWorld-Verified | 61.4% | Coming soon | Coming soon |
| VITA-Bench | 17.0% | Coming soon | Coming soon |
| Gert Labs | 48.51% | Coming soon | Coming soon |
| JobBench | 27.7% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Sonnet 4.5 public-lane score: Coming soon
- GPT-4o public-lane score: Coming soon

| Benchmark | Claude Sonnet 4.5 | GPT-4o | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 77.2% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Sonnet 4.5 public-lane score: 19.2 (Unranked · 1 rankable row)
- GPT-4o public-lane score: 56.1 (Unranked · 2 rankable rows)

| Benchmark | Claude Sonnet 4.5 | GPT-4o | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 13.6% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Claude Sonnet 4.5 public-lane score: Coming soon
- GPT-4o public-lane score: 31.7 (Estimated · #133/169)

| Benchmark | Claude Sonnet 4.5 | GPT-4o | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 83.4% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Claude Sonnet 4.5 public-lane score: Coming soon
- GPT-4o public-lane score: 37.6 (#106/124)

### Mathematics

- Winner: Insufficient shared evidence
- Claude Sonnet 4.5 public-lane score: 34.6 (Unranked · 2 rankable rows)
- GPT-4o public-lane score: 25.1 (Unranked · 1 rankable row)

| Benchmark | Claude Sonnet 4.5 | GPT-4o | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | 87% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 13.495% | 0.345% | Claude Sonnet 4.5 |
| FrontierMath v2 (Tier 4) | 4.167% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude Sonnet 4.5 and GPT-4o?

Not yet. The models share only 1 sourced benchmark row, 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 Sonnet 4.5 vs Claude Sonnet 4.5 Thinking](/compare/claude-sonnet-4-5-vs-claude-sonnet-4-5-thinking)
- [GPT-4o vs Claude Sonnet 4.5 Thinking](/compare/claude-sonnet-4-5-thinking-vs-gpt-4o)
- [Claude Sonnet 4.5 vs GPT-4o mini](/compare/claude-sonnet-4-5-vs-gpt-4o-mini)
- [GPT-4o vs GPT-4o mini](/compare/gpt-4o-vs-gpt-4o-mini)

## Explore More

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