Model comparison
GPT-5.3 Chat vs o4-mini
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 41.6 on the Noometry Index. o4-mini costs 2.5× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. GPT-5.3 Chat scores higher in 4 categories and o4-mini in 4 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where GPT-5.3 Chat leads 63.1 to 54.0.
- o4-mini is cheaper at $1.10 / $4.40 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
- o4-mini accepts more context: 200K tokens versus 128K.
Side by side
| GPT-5.3 Chat | o4-mini | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 42.8 | 41.6 |
| Released | 2026-03-03 | 2025-04-16 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | 200K |
| Max output | 16K | 100K |
| Input $ / M tokens | $1.75 | $1.10 |
| Output $ / M tokens | $14 | $4.40 |
| Results tracked | 18 | 60 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Too close to call
GPT-5.3 Chat: 41.4 (#124), o4-mini: 40.9 (#127)
| Benchmark | GPT-5.3 Chat | o4-mini |
|---|---|---|
| LMArena Coding | 1408 | 1368 |
| SWE-bench Verified (bash only) | — | 45% |
| Aider Polyglot | — | 72% |
| GSO | — | 3.6% |
| WeirdML | — | 52.6% |
| CadEval | — | 62% |
| ALE-Bench | — | 826.17 |
| AlgoTune | — | 1.72 |
Agentic & Tool Use Not comparable
GPT-5.3 Chat: —, o4-mini: 32.6 (#61)
| Benchmark | GPT-5.3 Chat | o4-mini |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 53.2% |
| GDPval | — | 25.3% |
| METR Time Horizons | — | 63.9% |
Reasoning GPT-5.3 Chat leads
GPT-5.3 Chat: 28.5 (#102), o4-mini: 24.6 (#162)
| Benchmark | GPT-5.3 Chat | o4-mini |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1351 |
| ARC-AGI-2 | — | 6.1% |
| SimpleBench | — | 38.7% |
| Kagi LLM Benchmark | — | 67.6% |
| ARC-AGI-1 | — | 58.7% |
| CritPt | — | 0.6% |
| Chess Puzzles | — | 26% |
| EnigmaEval | — | 9.2% |
| Mystery Game Puzzles | — | 5% |
| DTBench | — | 77.6% |
| LMCA | — | 26.5% |
| Epoch Capabilities Index | — | 145.64 |
| ForecastBench | — | 61.8 |
Math o4-mini leads
GPT-5.3 Chat: 38.2 (#142), o4-mini: 40.8 (#89)
| Benchmark | GPT-5.3 Chat | o4-mini |
|---|---|---|
| LMArena Math | 1389 | 1389 |
| FrontierMath (Tiers 1-3) | — | 36.1% |
| FrontierMath Tier 4 | — | 4.9% |
| OTIS Mock AIME 2024-2025 | — | 81.7% |
| Omni-MATH | — | 72% |
| MATH Level 5 | — | 97.8% |
| FrontierMath (Feb 2025 set) | — | 24.8% |
| FrontierMath Tier 4 (v1) | — | 6.3% |
Knowledge o4-mini leads
GPT-5.3 Chat: 38.8 (#140), o4-mini: 43.6 (#91)
| Benchmark | GPT-5.3 Chat | o4-mini |
|---|---|---|
| LMArena Expert | 1397 | 1343 |
| GPQA Diamond | — | 79.6% |
| Humanity's Last Exam | — | 18.1% |
| SimpleQA Verified | — | 19.6% |
| MMLU-Pro | — | 82% |
| Confabulations | — | 15.8% |
| Vectara Hallucination Rate | — | 18.6% |
| GPQA (HELM) | — | 73.5% |
Multimodal Not comparable
GPT-5.3 Chat: —, o4-mini: 40.2 (#49)
| Benchmark | GPT-5.3 Chat | o4-mini |
|---|---|---|
| LMArena Vision | — | 1194 |
| GeoBench | — | 64% |
| VPCT | — | 57.5% |
Multilingual GPT-5.3 Chat leads
GPT-5.3 Chat: 50.3 (#124), o4-mini: 47.0 (#154)
| Benchmark | GPT-5.3 Chat | o4-mini |
|---|---|---|
| LMArena Non-English | 1382 | 1337 |
| LMArena Chinese | 1432 | 1354 |
| LMArena French | 1397 | 1364 |
| LMArena German | 1384 | 1336 |
| LMArena Japanese | 1352 | 1308 |
| LMArena Korean | 1346 | 1312 |
| LMArena Russian | 1400 | 1334 |
| LMArena Spanish | 1371 | 1347 |
Instruction Following o4-mini leads
GPT-5.3 Chat: 72.8 (#129), o4-mini: 75.2 (#68)
| Benchmark | GPT-5.3 Chat | o4-mini |
|---|---|---|
| LMArena Instruction Following | 1378 | 1321 |
| IFEval | — | 92.8% |
Long Context o4-mini leads
GPT-5.3 Chat: 42.6 (#120), o4-mini: 45.5 (#33)
| Benchmark | GPT-5.3 Chat | o4-mini |
|---|---|---|
| LMArena Longer Query | 1396 | 1315 |
| Fiction.LiveBench | — | 77.8% |
Writing & Preference GPT-5.3 Chat leads
GPT-5.3 Chat: 63.1 (#68), o4-mini: 54.0 (#152)
| Benchmark | GPT-5.3 Chat | o4-mini |
|---|---|---|
| LMArena Text | 1389 | 1353 |
| LMArena Creative Writing | 1355 | 1294 |
| LMArena Multi-Turn | 1412 | 1350 |
| Short-Story Creative Writing | — | 75% |
| EQ-Bench Creative Writing | 1690 | — |
| WildBench | — | 85.4% |
Frequently asked questions
Is GPT-5.3 Chat better than o4-mini?
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 41.6 on the Noometry Index. o4-mini costs 2.5× 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 o4-mini?
o4-mini is cheaper. It lists at $1.10 per million input tokens and $4.40 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.
Is GPT-5.3 Chat or o4-mini better for coding?
They score almost the same on coding (41.4 vs 40.9); test both on your own repository before choosing.
Which has the bigger context window?
o4-mini does, with 200K tokens against 128K.
How many benchmarks do GPT-5.3 Chat and o4-mini share?
17 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and o4-mini has 60.