Model comparison
GPT-5.3 Chat vs Phi 3 Medium 4k Instruct
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 33.0 on the Noometry Index.
Last verified . 17 shared benchmarks.
MicrosoftSummary
- They share 17 benchmarks with published results for both. GPT-5.3 Chat scores higher in 8 categories and Phi 3 Medium 4k Instruct 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 34.1.
- Phi 3 Medium 4k Instruct has downloadable open weights; the other is API-only.
Side by side
| GPT-5.3 Chat | Phi 3 Medium 4k Instruct | |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 42.8 | 33.0 |
| Released | 2026-03-03 | — |
| Weights | Proprietary | Open |
| Context window | 128K | — |
| Max output | 16K | — |
| Input $ / M tokens | $1.75 | — |
| Output $ / M tokens | $14 | — |
| Results tracked | 18 | 17 |
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Category by category
Coding GPT-5.3 Chat leads
GPT-5.3 Chat: 41.4 (#124), Phi 3 Medium 4k Instruct: 32.9 (#268)
| Benchmark | GPT-5.3 Chat | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Coding | 1408 | 1130 |
Reasoning GPT-5.3 Chat leads
GPT-5.3 Chat: 28.5 (#102), Phi 3 Medium 4k Instruct: 21.7 (#214)
| Benchmark | GPT-5.3 Chat | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1127 |
Math GPT-5.3 Chat leads
GPT-5.3 Chat: 38.2 (#142), Phi 3 Medium 4k Instruct: 33.4 (#202)
| Benchmark | GPT-5.3 Chat | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Math | 1389 | 1173 |
Knowledge GPT-5.3 Chat leads
GPT-5.3 Chat: 38.8 (#140), Phi 3 Medium 4k Instruct: 30.2 (#229)
| Benchmark | GPT-5.3 Chat | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Expert | 1397 | 1108 |
Multilingual GPT-5.3 Chat leads
GPT-5.3 Chat: 50.3 (#124), Phi 3 Medium 4k Instruct: 30.6 (#263)
| Benchmark | GPT-5.3 Chat | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Non-English | 1382 | 1094 |
| LMArena Chinese | 1432 | 1108 |
| LMArena French | 1397 | 1110 |
| LMArena German | 1384 | 1101 |
| LMArena Japanese | 1352 | 1042 |
| LMArena Korean | 1346 | 954 |
| LMArena Russian | 1400 | 1145 |
| LMArena Spanish | 1371 | 1095 |
Instruction Following GPT-5.3 Chat leads
GPT-5.3 Chat: 72.8 (#129), Phi 3 Medium 4k Instruct: 57.6 (#268)
| Benchmark | GPT-5.3 Chat | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Instruction Following | 1378 | 1113 |
Long Context GPT-5.3 Chat leads
GPT-5.3 Chat: 42.6 (#120), Phi 3 Medium 4k Instruct: 34.0 (#255)
| Benchmark | GPT-5.3 Chat | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Longer Query | 1396 | 1120 |
Writing & Preference GPT-5.3 Chat leads
GPT-5.3 Chat: 63.1 (#68), Phi 3 Medium 4k Instruct: 34.1 (#272)
| Benchmark | GPT-5.3 Chat | Phi 3 Medium 4k Instruct |
|---|---|---|
| LMArena Text | 1389 | 1138 |
| LMArena Creative Writing | 1355 | 1107 |
| LMArena Multi-Turn | 1412 | 1088 |
| EQ-Bench Creative Writing | 1690 | — |
Frequently asked questions
Is GPT-5.3 Chat better than Phi 3 Medium 4k Instruct?
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 33.0 on the Noometry Index.
Is GPT-5.3 Chat or Phi 3 Medium 4k Instruct better for coding?
GPT-5.3 Chat scores higher on coding benchmarks: 41.4 versus 32.9 in the Noometry coding category.
How many benchmarks do GPT-5.3 Chat and Phi 3 Medium 4k Instruct share?
17 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Phi 3 Medium 4k Instruct has 17.