# GPT-5.2-Codex vs Grok Voice Think Fast 1.0

> Side-by-side benchmark comparison for GPT-5.2-Codex and Grok Voice Think Fast 1.0 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-2-codex-vs-grok-voice-think-fast-1-0
- Last updated: September 18, 2026

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

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for GPT-5.2-Codex and Grok Voice Think Fast 1.0.

## Summary

- GPT-5.2-Codex and Grok Voice Think Fast 1.0 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-5.2-Codex | Grok Voice Think Fast 1.0 |
|----------|----------|----------|
| Creator | OpenAI | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 400K | N/A |
| Independent public score (not head-to-head) | 53.95 | null |
| Benchmarks Covered | 3 | 0 |
| Pricing (input/output) | $1.75 / $14.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 50.4 (Estimated · #50/154)
- Grok Voice Think Fast 1.0 public-lane score: Coming soon

| Benchmark | GPT-5.2-Codex | Grok Voice Think Fast 1.0 | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 51.79% | Coming soon | Coming soon |
| JobBench | 26.0% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 51.4 (Supported · #52/154)
- Grok Voice Think Fast 1.0 public-lane score: Coming soon

| Benchmark | GPT-5.2-Codex | Grok Voice Think Fast 1.0 | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 37.91% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 72.5 (Unranked · 1 rankable row)
- Grok Voice Think Fast 1.0 public-lane score: Coming soon

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 77.6 (Unranked · 2 rankable rows)
- Grok Voice Think Fast 1.0 public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 56.1 (Estimated · #50/184)
- Grok Voice Think Fast 1.0 public-lane score: Coming soon

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.2-Codex public-lane score: 92.4 (#3/124)
- Grok Voice Think Fast 1.0 public-lane score: Coming soon

## FAQ

### Can I compare GPT-5.2-Codex and Grok Voice Think Fast 1.0 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-5.2-Codex vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gpt-5-2-codex)
- [Grok Voice Think Fast 1.0 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-grok-voice-think-fast-1-0)
- [GPT-5.2-Codex vs GPT-6 Astra](/compare/gpt-5-2-codex-vs-gpt-6-astra)
- [Grok Voice Think Fast 1.0 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-voice-think-fast-1-0)

## Explore More

- [GPT-5.2-Codex profile](/models/gpt-5-2-codex)
- [Grok Voice Think Fast 1.0 profile](/models/grok-voice-think-fast-1-0)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)