# GPT-OSS 120B vs Grok Code Fast 1

> Side-by-side benchmark comparison for GPT-OSS 120B and Grok Code Fast 1 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-oss-120b-vs-grok-code-fast-1
- 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: GPT-OSS 120B and Grok Code Fast 1 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.
- Grok Code Fast 1 has the larger published context window at 256K.

## Model Snapshot

| Property | GPT-OSS 120B | Grok Code Fast 1 |
|----------|----------|----------|
| Creator | OpenAI | xAI |
| Type | Open Weight | Proprietary |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | 128K | 256K |
| Independent public score (not head-to-head) | 37.32 | 34.09 |
| Benchmarks Covered | 8 | 2 |
| Pricing (input/output) | $0.00 / $0.00 | $0.20 / $1.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-OSS 120B public-lane score: 19.5 (Estimated · #110/128)
- Grok Code Fast 1 public-lane score: Coming soon

| Benchmark | GPT-OSS 120B | Grok Code Fast 1 | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 29.61% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-OSS 120B public-lane score: 23 (Estimated · #111/150)
- Grok Code Fast 1 public-lane score: 16.7 (Estimated · #127/150)

| Benchmark | GPT-OSS 120B | Grok Code Fast 1 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 62.4% | 70.8% | Grok Code Fast 1 |
| React Native Evals | 71.6% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 62.0% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-OSS 120B public-lane score: 61.6 (Unranked · 2 rankable rows)
- Grok Code Fast 1 public-lane score: 62.3 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Insufficient shared evidence
- GPT-OSS 120B public-lane score: 38.6 (Supported · #122/184)
- Grok Code Fast 1 public-lane score: 35.9 (Estimated · #131/184)

| Benchmark | GPT-OSS 120B | Grok Code Fast 1 | Winner |
|-----------|-----------|-----------|--------|
| MMLU | 90% | Coming soon | Coming soon |
| GPQA | 80.1% | Coming soon | Coming soon |
| HLE | 14.9% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-OSS 120B public-lane score: 84.3 (#50/148)
- Grok Code Fast 1 public-lane score: 48.2 (#98/148)

### Mathematics

- Winner: Insufficient shared evidence
- GPT-OSS 120B public-lane score: Coming soon
- Grok Code Fast 1 public-lane score: Coming soon

| Benchmark | GPT-OSS 120B | Grok Code Fast 1 | Winner |
|-----------|-----------|-----------|--------|
| AIME 2024 | 95.8% | Coming soon | Coming soon |
| AIME 2025 | 92.5% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between GPT-OSS 120B and Grok Code Fast 1?

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 120B vs GPT-OSS 20B](/compare/gpt-oss-120b-vs-gpt-oss-20b)
- [Grok Code Fast 1 vs GPT-OSS 20B](/compare/gpt-oss-20b-vs-grok-code-fast-1)
- [GPT-OSS 120B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gpt-oss-120b)
- [Grok Code Fast 1 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-grok-code-fast-1)

## Explore More

- [GPT-OSS 120B profile](/models/gpt-oss-120b)
- [Grok Code Fast 1 profile](/models/grok-code-fast-1)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)