# Composer 2 vs GPT-OSS 20B

> Side-by-side benchmark comparison for Composer 2 and GPT-OSS 20B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/composer-2-vs-gpt-oss-20b
- Last updated: September 21, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Composer 2 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.
- Composer 2 has the larger published context window at 200K.

## Model Snapshot

| Property | Composer 2 | GPT-OSS 20B |
|----------|----------|----------|
| Creator | Cursor | OpenAI |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 200K | 128K |
| Independent public score (not head-to-head) | null | 41.27 |
| Benchmarks Covered | 5 | 1 |
| Pricing (input/output) | $0.50 / $2.50 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Composer 2 public-lane score: 49.5 (Estimated · #64/154)
- GPT-OSS 20B public-lane score: 36.8 (Estimated · #136/154)

| Benchmark | Composer 2 | GPT-OSS 20B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 61.7% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Composer 2 public-lane score: 49.5 (Estimated · #68/156)
- GPT-OSS 20B public-lane score: 38.9 (Estimated · #129/156)

| Benchmark | Composer 2 | GPT-OSS 20B | Winner |
|-----------|-----------|-----------|--------|
| SWE Multilingual | 73.7% | Coming soon | Coming soon |
| SWE-Rebench | 58% | Coming soon | Coming soon |
| React Native Evals | 96.1% | 71% | Composer 2 |
| Terminal-Bench 2.0 | 61.7% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Composer 2 public-lane score: Coming soon
- GPT-OSS 20B public-lane score: 44.9 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Insufficient shared evidence
- Composer 2 public-lane score: Coming soon
- GPT-OSS 20B public-lane score: 39.6 (Estimated · #138/186)

### Instruction Following

- Winner: Insufficient shared evidence
- Composer 2 public-lane score: Coming soon
- GPT-OSS 20B public-lane score: 77.8 (#54/124)

## FAQ

### Is there enough evidence to pick between Composer 2 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

- [Composer 2 vs Composer 2.5](/compare/composer-2-vs-composer-2-5)
- [GPT-OSS 20B vs Composer 2.5](/compare/composer-2-5-vs-gpt-oss-20b)
- [Composer 2 vs Composer 2 Fast](/compare/composer-2-vs-composer-2-fast)
- [GPT-OSS 20B vs Composer 2 Fast](/compare/composer-2-fast-vs-gpt-oss-20b)

## Explore More

- [Composer 2 profile](/models/composer-2)
- [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)