# Claude 4 Sonnet vs GPT-OSS 120B

> Side-by-side benchmark comparison for Claude 4 Sonnet and GPT-OSS 120B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-4-sonnet-vs-gpt-oss-120b
- 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 4 Sonnet and GPT-OSS 120B 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-OSS 120B has the lower published output-token price.
- Claude 4 Sonnet has the larger published context window at 200K.

## Model Snapshot

| Property | Claude 4 Sonnet | GPT-OSS 120B |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | 200K | 128K |
| Independent public score (not head-to-head) | 35.92 | 37.66 |
| Benchmarks Covered | 3 | 2 |
| Pricing (input/output) | $3.00 / $15.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude 4 Sonnet public-lane score: Coming soon
- GPT-OSS 120B public-lane score: 20.5 (Estimated · #97/117)

| Benchmark | Claude 4 Sonnet | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 39.66% | 29.61% | Claude 4 Sonnet |
| JobBench | 18.4% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude 4 Sonnet public-lane score: Coming soon
- GPT-OSS 120B public-lane score: 26.4 (Estimated · #104/143)

| Benchmark | Claude 4 Sonnet | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 72.7% | Coming soon | Coming soon |
| React Native Evals | Coming soon | 71.6% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude 4 Sonnet public-lane score: 52.5 (Unranked · 2 rankable rows)
- GPT-OSS 120B public-lane score: 58 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Claude 4 Sonnet public-lane score: 53 (Unranked · 1 rankable row)
- GPT-OSS 120B public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- Claude 4 Sonnet public-lane score: 37 (Estimated · #108/169)
- GPT-OSS 120B public-lane score: 37.1 (Estimated · #107/169)

### Instruction Following

- Winner: Insufficient shared evidence
- Claude 4 Sonnet public-lane score: 52 (#78/124)
- GPT-OSS 120B public-lane score: 82.8 (#46/124)

## FAQ

### Is there enough evidence to pick between Claude 4 Sonnet and GPT-OSS 120B?

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 4 Sonnet vs GPT-OSS 20B](/compare/claude-4-sonnet-vs-gpt-oss-20b)
- [GPT-OSS 120B vs GPT-OSS 20B](/compare/gpt-oss-120b-vs-gpt-oss-20b)
- [Claude 4 Sonnet vs GPT-6 Astra](/compare/claude-4-sonnet-vs-gpt-6-astra)
- [GPT-OSS 120B vs GPT-6 Astra](/compare/gpt-6-astra-vs-gpt-oss-120b)

## Explore More

- [Claude 4 Sonnet profile](/models/claude-4-sonnet)
- [GPT-OSS 120B profile](/models/gpt-oss-120b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)