# GPT-5.2-Codex vs Grok 4.1 Fast

> Side-by-side benchmark comparison for GPT-5.2-Codex and Grok 4.1 Fast across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-2-codex-vs-grok-4-1-fast
- 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-5.2-Codex and Grok 4.1 Fast 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 4.1 Fast has the lower published output-token price.
- Grok 4.1 Fast has the larger published context window at 1M.

## Model Snapshot

| Property | GPT-5.2-Codex | Grok 4.1 Fast |
|----------|----------|----------|
| Creator | OpenAI | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 400K | 1M |
| Independent public score (not head-to-head) | 55.3 | 36.45 |
| Benchmarks Covered | 5 | 1 |
| Pricing (input/output) | $1.75 / $14.00 | $0.20 / $0.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 40.8 (Estimated · #64/128)
- Grok 4.1 Fast public-lane score: Coming soon

| Benchmark | GPT-5.2-Codex | Grok 4.1 Fast | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 51.79% | 47.32% | GPT-5.2-Codex |
| JobBench | 26.0% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 43.7 (Supported · #56/150)
- Grok 4.1 Fast public-lane score: Coming soon

| Benchmark | GPT-5.2-Codex | Grok 4.1 Fast | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 37.91% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 88.0% | Coming soon | Coming soon |
| SWE-bench (Vals) | 72.4% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 82.4 (Unranked · 2 rankable rows)
- Grok 4.1 Fast public-lane score: 47.4 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 76.9 (Unranked · 1 rankable row)
- Grok 4.1 Fast public-lane score: 35.9 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 56.4 (Estimated · #54/184)
- Grok 4.1 Fast public-lane score: 31.5 (Estimated · #149/184)

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 93.8 (#4/148)
- Grok 4.1 Fast public-lane score: 41.9 (#114/148)

## FAQ

### Is there enough evidence to pick between GPT-5.2-Codex and Grok 4.1 Fast?

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-5.2-Codex vs Grok 4.1 Fast (Reasoning)](/compare/gpt-5-2-codex-vs-grok-4-1-fast-reasoning)
- [Grok 4.1 Fast vs Grok 4.1 Fast (Reasoning)](/compare/grok-4-1-fast-vs-grok-4-1-fast-reasoning)
- [GPT-5.2-Codex vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gpt-5-2-codex)
- [Grok 4.1 Fast vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-grok-4-1-fast)

## Explore More

- [GPT-5.2-Codex profile](/models/gpt-5-2-codex)
- [Grok 4.1 Fast profile](/models/grok-4-1-fast)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)