Model comparison
GPT-5-Codex vs Grok Build 0.1
GPT-5-Codex is the stronger model overall, scoring 37.9 to 36.4 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.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in agentic & tool use, where GPT-5-Codex leads 31.0 to 22.7.
- 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.
Side by side
| GPT-5-Codex | Grok Build 0.1 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 37.9 | 36.4 |
| Released | 2025-09-15 | 2026-04-16 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 256K |
| Max output | 128K | 256K |
| Input $ / M tokens | $1.25 | $1 |
| Output $ / M tokens | $10 | $2 |
| Results tracked | 3 | 3 |
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Category by category
Coding Too close to call
GPT-5-Codex: 42.4 (#103), Grok Build 0.1: 43.1 (#91)
Agentic & Tool Use GPT-5-Codex leads
GPT-5-Codex: 31.0 (#72), Grok Build 0.1: 22.7 (#129)
| Benchmark | GPT-5-Codex | Grok Build 0.1 |
|---|---|---|
| Terminal-Bench | 44.3% | — |
| GBAEval | — | 2.4% |
Reasoning Grok Build 0.1 leads
GPT-5-Codex: 30.9 (#83), Grok Build 0.1: 32.2 (#77)
| Benchmark | GPT-5-Codex | Grok Build 0.1 |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
| CritPt | — | 9.1% |
Frequently asked questions
Is GPT-5-Codex better than Grok Build 0.1?
GPT-5-Codex is the stronger model overall, scoring 37.9 to 36.4 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 (42.4 vs 43.1); 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.