# GPT-5.3 Chat vs Phi-4

> GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 31.2 on the Noometry Index. Phi-4 costs 55× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-3-chat-vs-phi-4
- Last updated: 2026-10-11
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GPT-5.3 Chat scores higher in 8 categories and Phi-4 in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where GPT-5.3 Chat leads 63.1 to 40.5.
- Phi-4 is cheaper at $0.07 / $0.14 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
- Phi-4 has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.3 Chat | Phi-4 |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 42.8 | 31.2 |
| Rank | 109 | 279 |
| Context | 128K | 128K |
| Input $/M | $1.75 | $0.07 |
| Output $/M | $14 | $0.14 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.3 Chat: 41.4 (#124)
- Phi-4: 34.4 (#239)

| Benchmark | GPT-5.3 Chat | Phi-4 |
|---|---|---|
| LMArena Coding | 1408 | 1231 |
| BigCodeBench Instruct | — | 45.5% |
| LiveBench Coding | — | 30.7% |
| BigCodeBench Complete | — | 55.4% |

## Agentic & Tool Use

- GPT-5.3 Chat: —
- Phi-4: 22.8 (#128)

| Benchmark | GPT-5.3 Chat | Phi-4 |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 28.8% |
| BALROG | — | 11.6% |

## Reasoning

- GPT-5.3 Chat: 28.5 (#102)
- Phi-4: 17.7 (#291)

| Benchmark | GPT-5.3 Chat | Phi-4 |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1220 |
| Chess Puzzles | — | 1% |
| LiveBench Reasoning | — | 47.8% |
| LiveBench Data Analysis | — | 45.2% |
| Epoch Capabilities Index | — | 130.42 |
| LiveBench | — | 41.6% |

## Math

- GPT-5.3 Chat: 38.2 (#142)
- Phi-4: 20.8 (#285)

| Benchmark | GPT-5.3 Chat | Phi-4 |
|---|---|---|
| LMArena Math | 1389 | 1246 |
| OTIS Mock AIME 2024-2025 | — | 13.8% |
| LiveBench Math | — | 42% |
| MATH Level 5 | — | 64.9% |

## Knowledge

- GPT-5.3 Chat: 38.8 (#140)
- Phi-4: 32.6 (#209)

| Benchmark | GPT-5.3 Chat | Phi-4 |
|---|---|---|
| LMArena Expert | 1397 | 1203 |
| GPQA Diamond | — | 56.1% |
| Confabulations | — | 29.4% |
| Vectara Hallucination Rate | — | 3.7% |
| MMLU | — | 84.8% |

## Multilingual

- GPT-5.3 Chat: 50.3 (#124)
- Phi-4: 37.2 (#237)

| Benchmark | GPT-5.3 Chat | Phi-4 |
|---|---|---|
| LMArena Non-English | 1382 | 1197 |
| LMArena Chinese | 1432 | 1212 |
| LMArena French | 1397 | 1224 |
| LMArena German | 1384 | 1222 |
| LMArena Japanese | 1352 | 1158 |
| LMArena Korean | 1346 | 1151 |
| LMArena Russian | 1400 | 1209 |
| LMArena Spanish | 1371 | 1234 |

## Instruction Following

- GPT-5.3 Chat: 72.8 (#129)
- Phi-4: 60.4 (#251)

| Benchmark | GPT-5.3 Chat | Phi-4 |
|---|---|---|
| LMArena Instruction Following | 1378 | 1201 |
| LiveBench Instruction Following | — | 58.4% |

## Long Context

- GPT-5.3 Chat: 42.6 (#120)
- Phi-4: 36.9 (#226)

| Benchmark | GPT-5.3 Chat | Phi-4 |
|---|---|---|
| LMArena Longer Query | 1396 | 1217 |

## Writing & Preference

- GPT-5.3 Chat: 63.1 (#68)
- Phi-4: 40.5 (#244)

| Benchmark | GPT-5.3 Chat | Phi-4 |
|---|---|---|
| LMArena Text | 1389 | 1217 |
| LMArena Creative Writing | 1355 | 1182 |
| LMArena Multi-Turn | 1412 | 1206 |
| Short-Story Creative Writing | — | 62.6% |
| EQ-Bench Creative Writing | 1690 | — |
| LiveBench Language | — | 25.6% |

## FAQ

### Is GPT-5.3 Chat better than Phi-4?

GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 31.2 on the Noometry Index. Phi-4 costs 55× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.3 Chat or Phi-4?

Phi-4 is cheaper. It lists at $0.07 per million input tokens and $0.14 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

### Is GPT-5.3 Chat or Phi-4 better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 41.4 versus 34.4 in the Noometry coding category.

### Which has the bigger context window?

Both accept 128K tokens.

### How many benchmarks do GPT-5.3 Chat and Phi-4 share?

17 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Phi-4 has 37.