# GPT-5.1-Codex-Max vs Grok 4

> Side-by-side benchmark comparison for GPT-5.1-Codex-Max and Grok 4 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-1-codex-max-vs-grok-4
- Last updated: October 17, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for GPT-5.1-Codex-Max and Grok 4.

## Summary

- GPT-5.1-Codex-Max and Grok 4 do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | GPT-5.1-Codex-Max | Grok 4 |
|----------|----------|----------|
| Creator | OpenAI | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 400K | 128K |
| Independent public score (not head-to-head) | null | 51.77 |
| Benchmarks Covered | 2 | 2 |
| Pricing (input/output) | $1.25 / $10.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.1-Codex-Max public-lane score: Coming soon
- Grok 4 public-lane score: Coming soon

| Benchmark | GPT-5.1-Codex-Max | Grok 4 | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | Coming soon | 42.34% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.1-Codex-Max public-lane score: Coming soon
- Grok 4 public-lane score: Coming soon

| Benchmark | GPT-5.1-Codex-Max | Grok 4 | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 22.17% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 83.6% | Coming soon | Coming soon |
| React Native Evals | Coming soon | 72.6% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.1-Codex-Max public-lane score: Coming soon
- Grok 4 public-lane score: 72.6 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.1-Codex-Max public-lane score: Coming soon
- Grok 4 public-lane score: 65.9 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.1-Codex-Max public-lane score: Coming soon
- Grok 4 public-lane score: 50.4 (Estimated · #80/184)

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.1-Codex-Max public-lane score: Coming soon
- Grok 4 public-lane score: 64.3 (#78/148)

## FAQ

### Can I compare GPT-5.1-Codex-Max and Grok 4 on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [GPT-5.1-Codex-Max vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gpt-5-1-codex-max)
- [Grok 4 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-grok-4)
- [GPT-5.1-Codex-Max vs GPT-6.1 Sol](/compare/gpt-5-1-codex-max-vs-gpt-6-1-sol)
- [Grok 4 vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-grok-4)

## Explore More

- [GPT-5.1-Codex-Max profile](/models/gpt-5-1-codex-max)
- [Grok 4 profile](/models/grok-4)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)