# GPT-5.3 Codex vs Grok 4.6

> Side-by-side benchmark comparison for GPT-5.3 Codex and Grok 4.6 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-3-codex-vs-grok-4-6
- Last updated: September 25, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-5.3 Codex and Grok 4.6 share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Grok 4.6 has the lower published output-token price.
- Grok 4.6 has the larger published context window at 500K.

## Model Snapshot

| Property | GPT-5.3 Codex | Grok 4.6 |
|----------|----------|----------|
| Creator | OpenAI | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 400K | 500K |
| Independent public score (not head-to-head) | 62.18 | 69.19 |
| Benchmarks Covered | 10 | 17 |
| Pricing (input/output) | $1.75 / $14.00 | $2.00 / $6.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 54.2 (Estimated · #31/105)
- Grok 4.6 public-lane score: 67.9 (Supported · #8/105)

| Benchmark | GPT-5.3 Codex | Grok 4.6 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 77.3% | Coming soon | Coming soon |
| OSWorld-Verified | 64.7% | Coming soon | Coming soon |
| Gert Labs | 57.47% | Coming soon | Coming soon |
| JobBench | 33.7% | Coming soon | Coming soon |
| Terminal-Bench 3.0 | Coming soon | 26.5% | Coming soon |
| APEX-Agents | Coming soon | 57.5% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 78.3% | Coming soon |
| ApprenticeBench | Coming soon | 13% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 55.9 (Supported · #26/135)
- Grok 4.6 public-lane score: 62 (Supported · #14/135)

| Benchmark | GPT-5.3 Codex | Grok 4.6 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 85% | Coming soon | Coming soon |
| SWE-bench Pro | 56.8% | Coming soon | Coming soon |
| SWE-Rebench | 58.2% | Coming soon | Coming soon |
| Vibe Code Bench | 61.77% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.3% | 88.2% | Grok 4.6 |
| SWE-bench (Vals) | 78.0% | 95.6% | Grok 4.6 |
| Bug Hunt Bench | Coming soon | 27 fixes | Coming soon |
| DeepSWE | Coming soon | 65.9% | Coming soon |
| cursorBench32 | Coming soon | 70.8% | Coming soon |
| FrontierCode 1.1 Extended | Coming soon | 61.3% | Coming soon |
| VulcanBench v3 | Coming soon | 87.0% | Coming soon |
| FrontierSWE v2 | Coming soon | 25.3% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 79.3 (Unranked · 2 rankable rows)
- Grok 4.6 public-lane score: 57.6 (#16/19)

| Benchmark | GPT-5.3 Codex | Grok 4.6 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | Coming soon | 87.00% | Coming soon |
| ARC-AGI-2 | Coming soon | 67.1% | Coming soon |
| ARC-AGI-3 | Coming soon | 2.1% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 75.7 (Unranked · 1 rankable row)
- Grok 4.6 public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 64.3 (Estimated · #26/158)
- Grok 4.6 public-lane score: 69 (Supported · #13/158)

| Benchmark | GPT-5.3 Codex | Grok 4.6 | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | Coming soon | 94.7% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 89.4% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 91.2 (#14/124)
- Grok 4.6 public-lane score: Coming soon

## FAQ

### Is there enough evidence to pick between GPT-5.3 Codex and Grok 4.6?

Not yet. The models share only 2 sourced benchmark rows, 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-5.3 Codex vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-vs-gpt-5-3-codex-spark)
- [Grok 4.6 vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-spark-vs-grok-4-6)
- [GPT-5.3 Codex vs GPT-6 Astra](/compare/gpt-5-3-codex-vs-gpt-6-astra)
- [Grok 4.6 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-4-6)

## Explore More

- [GPT-5.3 Codex profile](/models/gpt-5-3-codex)
- [Grok 4.6 profile](/models/grok-4-6)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)