# Claude Opus 4.7 vs GPT-OSS 20B

> Side-by-side benchmark comparison for Claude Opus 4.7 and GPT-OSS 20B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-4-7-vs-gpt-oss-20b
- Last updated: October 17, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude Opus 4.7 and GPT-OSS 20B 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 20B has the lower published output-token price.
- Claude Opus 4.7 has the larger published context window at 1M.

## Model Snapshot

| Property | Claude Opus 4.7 | GPT-OSS 20B |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | 1M | 128K |
| Independent public score (not head-to-head) | 66.74 | 33.32 |
| Benchmarks Covered | 15 | 7 |
| Pricing (input/output) | $5.00 / $25.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Opus 4.7 public-lane score: 54.5 (Supported · #42/128)
- GPT-OSS 20B public-lane score: 14.9 (Estimated · #115/128)

| Benchmark | Claude Opus 4.7 | GPT-OSS 20B | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 65.59% | Coming soon | Coming soon |
| ResearchClawBench | 20.7% | Coming soon | Coming soon |
| OSWorld 2.0 | 13.9% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 68.5% | Coming soon | Coming soon |
| ApprenticeBench | 7% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Opus 4.7 public-lane score: 55.4 (Supported · #32/150)
- GPT-OSS 20B public-lane score: 18.2 (Estimated · #123/150)

| Benchmark | Claude Opus 4.7 | GPT-OSS 20B | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 71.00% | Coming soon | Coming soon |
| React Native Evals | 82.8% | 71% | Claude Opus 4.7 |
| FrontierCode 1.1 Main | 38.5% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 85.1% | Coming soon | Coming soon |
| SWE-bench (Vals) | 82.0% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 28.6% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 60.7% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Opus 4.7 public-lane score: Coming soon
- GPT-OSS 20B public-lane score: 49.7 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Insufficient shared evidence
- Claude Opus 4.7 public-lane score: 66.2 (Estimated · #30/184)
- GPT-OSS 20B public-lane score: 33.9 (Supported · #140/184)

| Benchmark | Claude Opus 4.7 | GPT-OSS 20B | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 90.2% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 89.9% | Coming soon | Coming soon |
| MMLU | Coming soon | 85.3% | Coming soon |
| GPQA | Coming soon | 71.5% | Coming soon |
| HLE | Coming soon | 10.9% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Claude Opus 4.7 public-lane score: Coming soon
- GPT-OSS 20B public-lane score: 79.2 (#60/148)

### Mathematics

- Winner: Insufficient shared evidence
- Claude Opus 4.7 public-lane score: 72.9 (Unranked · 2 rankable rows)
- GPT-OSS 20B public-lane score: Coming soon

| Benchmark | Claude Opus 4.7 | GPT-OSS 20B | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 70.175% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 31.707% | Coming soon | Coming soon |
| AIME 2024 | Coming soon | 92.1% | Coming soon |
| AIME 2025 | Coming soon | 91.7% | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude Opus 4.7 and GPT-OSS 20B?

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 Opus 4.7 vs Claude Opus 4.7 (Adaptive)](/compare/claude-opus-4-7-vs-claude-opus-4-7-adaptive)
- [GPT-OSS 20B vs Claude Opus 4.7 (Adaptive)](/compare/claude-opus-4-7-adaptive-vs-gpt-oss-20b)
- [Claude Opus 4.7 vs GPT-OSS 120B](/compare/claude-opus-4-7-vs-gpt-oss-120b)
- [GPT-OSS 20B vs GPT-OSS 120B](/compare/gpt-oss-120b-vs-gpt-oss-20b)

## Explore More

- [Claude Opus 4.7 profile](/models/claude-opus-4-7)
- [GPT-OSS 20B profile](/models/gpt-oss-20b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)