# GPT-5-Codex vs Phi-4 Mini

> GPT-5-Codex is the stronger model overall, scoring 37.9 to 30.9 on the Noometry Index. Phi-4 Mini costs 26× 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-phi-4-mini
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-5-Codex leads 42.4 to 28.1.
- Phi-4 Mini is cheaper at $0.075 / $0.30 per million input/output tokens, against $1.25 / $10 for GPT-5-Codex.
- GPT-5-Codex accepts more context: 400K tokens versus 128K.
- Phi-4 Mini has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5-Codex | Phi-4 Mini |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 37.9 | 30.9 |
| Rank | 192 | 283 |
| Context | 400K | 128K |
| Input $/M | $1.25 | $0.075 |
| Output $/M | $10 | $0.30 |
| Weights | Proprietary | Open |

## Coding

- GPT-5-Codex: 42.4 (#103)
- Phi-4 Mini: 28.1 (#317)

| Benchmark | GPT-5-Codex | Phi-4 Mini |
|---|---|---|
| SciCode | — | 10.8% |
| WeirdML | 54.5% | — |

## Agentic & Tool Use

- GPT-5-Codex: 31.0 (#72)
- Phi-4 Mini: —

| Benchmark | GPT-5-Codex | Phi-4 Mini |
|---|---|---|
| Terminal-Bench | 44.3% | — |

## Reasoning

- GPT-5-Codex: 30.9 (#83)
- Phi-4 Mini: 22.4 (#195)

| Benchmark | GPT-5-Codex | Phi-4 Mini |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
| CritPt | — | 0% |

## Knowledge

- GPT-5-Codex: —
- Phi-4 Mini: 25.3 (#262)

| Benchmark | GPT-5-Codex | Phi-4 Mini |
|---|---|---|
| Vectara Hallucination Rate | — | 23.5% |

## FAQ

### Is GPT-5-Codex better than Phi-4 Mini?

GPT-5-Codex is the stronger model overall, scoring 37.9 to 30.9 on the Noometry Index. Phi-4 Mini costs 26× 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 Phi-4 Mini?

Phi-4 Mini is cheaper. It lists at $0.075 per million input tokens and $0.30 per million output tokens; GPT-5-Codex lists at $1.25 and $10.

### Is GPT-5-Codex or Phi-4 Mini better for coding?

GPT-5-Codex scores higher on coding benchmarks: 42.4 versus 28.1 in the Noometry coding category.

### Which has the bigger context window?

GPT-5-Codex does, with 400K tokens against 128K.

### How many benchmarks do GPT-5-Codex and Phi-4 Mini share?

0 benchmarks have published results for both models. GPT-5-Codex has 3 scored results on Noometry and Phi-4 Mini has 3.