# Claude Sonnet 4.5 Thinking vs GPT-5 (high)

> Side-by-side benchmark comparison for Claude Sonnet 4.5 Thinking and GPT-5 (high) across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

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

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude Sonnet 4.5 Thinking and GPT-5 (high) 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.
- Claude Sonnet 4.5 Thinking has the larger published context window at 200K.

## Model Snapshot

| Property | Claude Sonnet 4.5 Thinking | GPT-5 (high) |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 200K | 128K |
| Independent public score (not head-to-head) | null | 58.03 |
| Benchmarks Covered | 1 | 2 |
| Pricing (input/output) | N/A | $1.25 / $10.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Sonnet 4.5 Thinking public-lane score: Coming soon
- GPT-5 (high) public-lane score: 51.1 (Estimated · #59/151)

| Benchmark | Claude Sonnet 4.5 Thinking | GPT-5 (high) | Winner |
|-----------|-----------|-----------|--------|
| JobBench | Coming soon | 8.5% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Sonnet 4.5 Thinking public-lane score: Coming soon
- GPT-5 (high) public-lane score: Coming soon

| Benchmark | Claude Sonnet 4.5 Thinking | GPT-5 (high) | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 22.62% | 20.09% | Claude Sonnet 4.5 Thinking |

## FAQ

### Is there enough evidence to pick between Claude Sonnet 4.5 Thinking and GPT-5 (high)?

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 Thinking vs Claude Sonnet 4.5](/compare/claude-sonnet-4-5-vs-claude-sonnet-4-5-thinking)
- [GPT-5 (high) vs Claude Sonnet 4.5](/compare/claude-sonnet-4-5-vs-gpt-5-high)
- [Claude Sonnet 4.5 Thinking vs GPT-5 (medium)](/compare/claude-sonnet-4-5-thinking-vs-gpt-5-medium)
- [GPT-5 (high) vs GPT-5 (medium)](/compare/gpt-5-high-vs-gpt-5-medium)

## Explore More

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