# GPT-5-Codex vs Grok Build 0.1

> GPT-5-Codex is the stronger model overall, scoring 37.3 to 35.8 on the Noometry Index. Grok Build 0.1 costs 2.8× less per token, which makes it the better buy when GPT-5-Codex's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-codex-vs-grok-build-0-1
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in agentic & tool use, where GPT-5-Codex leads 30.8 to 22.5.
- Grok Build 0.1 is cheaper at $1 / $2 per million input/output tokens, against $1.25 / $10 for GPT-5-Codex.
- GPT-5-Codex accepts more context: 400K tokens versus 256K.

## Snapshot

| | GPT-5-Codex | Grok Build 0.1 |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 37.3 | 35.8 |
| Rank | 190 | 214 |
| Context | 400K | 256K |
| Input $/M | $1.25 | $1 |
| Output $/M | $10 | $2 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5-Codex: 41.9 (#100)
- Grok Build 0.1: 42.5 (#90)

| Benchmark | GPT-5-Codex | Grok Build 0.1 |
|---|---|---|
| SciCode | — | 50.2% |
| WeirdML | 54.5% | — |

## Agentic & Tool Use

- GPT-5-Codex: 30.8 (#66)
- Grok Build 0.1: 22.5 (#122)

| Benchmark | GPT-5-Codex | Grok Build 0.1 |
|---|---|---|
| Terminal-Bench | 44.3% | — |
| GBAEval | — | 2.4% |

## Reasoning

- GPT-5-Codex: 30.0 (#80)
- Grok Build 0.1: 31.3 (#73)

| Benchmark | GPT-5-Codex | Grok Build 0.1 |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
| CritPt | — | 9.1% |

## FAQ

### Is GPT-5-Codex better than Grok Build 0.1?

GPT-5-Codex is the stronger model overall, scoring 37.3 to 35.8 on the Noometry Index. Grok Build 0.1 costs 2.8× less per token, which makes it the better buy when GPT-5-Codex's lead doesn't matter for your workload.

### Which is cheaper, GPT-5-Codex or Grok Build 0.1?

Grok Build 0.1 is cheaper. It lists at $1 per million input tokens and $2 per million output tokens; GPT-5-Codex lists at $1.25 and $10.

### Is GPT-5-Codex or Grok Build 0.1 better for coding?

They score almost the same on coding (41.9 vs 42.5); test both on your own repository before choosing.

### Which has the bigger context window?

GPT-5-Codex does, with 400K tokens against 256K.

### How many benchmarks do GPT-5-Codex and Grok Build 0.1 share?

0 benchmarks have published results for both models. GPT-5-Codex has 3 scored results on Noometry and Grok Build 0.1 has 3.