# GPT-OSS 20B vs Grok 4

> Side-by-side benchmark comparison for GPT-OSS 20B and Grok 4 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-oss-20b-vs-grok-4
- 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: GPT-OSS 20B and Grok 4 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.
- Grok 4 has the lower published output-token price.

## Model Snapshot

| Property | GPT-OSS 20B | Grok 4 |
|----------|----------|----------|
| Creator | OpenAI | xAI |
| Type | Open Weight | Proprietary |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | 128K | 128K |
| Independent public score (not head-to-head) | 33.57 | 52.6 |
| Benchmarks Covered | 1 | 4 |
| Pricing (input/output) | $0.00 / $0.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-OSS 20B public-lane score: 16.1 (Estimated · #106/117)
- Grok 4 public-lane score: Coming soon

| Benchmark | GPT-OSS 20B | Grok 4 | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | Coming soon | 42.34% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-OSS 20B public-lane score: 21.7 (Estimated · #117/143)
- Grok 4 public-lane score: Coming soon

| Benchmark | GPT-OSS 20B | Grok 4 | Winner |
|-----------|-----------|-----------|--------|
| React Native Evals | 71% | 72.6% | Grok 4 |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-OSS 20B public-lane score: 46 (Unranked · 2 rankable rows)
- Grok 4 public-lane score: 69 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-OSS 20B public-lane score: Coming soon
- Grok 4 public-lane score: 62.5 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- GPT-OSS 20B public-lane score: 33 (Estimated · #125/169)
- Grok 4 public-lane score: 48.5 (Estimated · #65/169)

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-OSS 20B public-lane score: 77.8 (#54/124)
- Grok 4 public-lane score: 62.9 (#71/124)

### Mathematics

- Winner: Insufficient shared evidence
- GPT-OSS 20B public-lane score: Coming soon
- Grok 4 public-lane score: 38.3 (Unranked · 2 rankable rows)

| Benchmark | GPT-OSS 20B | Grok 4 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | Coming soon | 19.655% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 2.083% | Coming soon |

## FAQ

### Is there enough evidence to pick between GPT-OSS 20B and Grok 4?

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

- [GPT-OSS 20B vs GPT-OSS 120B](/compare/gpt-oss-120b-vs-gpt-oss-20b)
- [Grok 4 vs GPT-OSS 120B](/compare/gpt-oss-120b-vs-grok-4)
- [GPT-OSS 20B vs GPT-6 Astra](/compare/gpt-6-astra-vs-gpt-oss-20b)
- [Grok 4 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-4)

## Explore More

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