Model comparison
GPT-5.2 vs GPT-5.3 Codex
GPT-5.2 is the stronger model overall, scoring 54.1 to 45.8 on the Noometry Index.
Last verified . 8 shared benchmarks.
Summary
- They share 8 benchmarks with published results for both. GPT-5.2 scores higher in 1 category and GPT-5.3 Codex in 1 category; 2 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where GPT-5.3 Codex leads 48.0 to 40.2.
- The biggest single-benchmark swing is Terminal-Bench: 64.9% for GPT-5.2 and 78.4% for GPT-5.3 Codex.
- Both cost about the same: $1.75 input and $14 output per million tokens.
Side by side
| GPT-5.2 | GPT-5.3 Codex | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 54.1 | 45.8 |
| Released | 2025-12-11 | 2026-02-05 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 400K |
| Max output | 128K | 128K |
| Input $ / M tokens | $1.75 | $1.75 |
| Output $ / M tokens | $14 | $14 |
| Results tracked | 67 | 8 |
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Category by category
Coding GPT-5.2 leads
GPT-5.2: 51.6 (#37), GPT-5.3 Codex: 48.6 (#56)
| Benchmark | GPT-5.2 | GPT-5.3 Codex |
|---|---|---|
| SWE-bench Verified | 73.8% | 74.8% |
| LMArena WebDev | 1416 | 1409 |
| WeirdML | 72.2% | 79.3% |
| ALE-Bench | 1,294 | 1,655 |
| SWE-bench Verified (bash only) | 72.8% | — |
| SWE-bench Multilingual | 66.7% | — |
| GSO | 27.4% | — |
| LMArena Coding | 1447 | — |
| AlgoTune | 2.05 | — |
Agentic & Tool Use GPT-5.3 Codex leads
GPT-5.2: 40.2 (#24), GPT-5.3 Codex: 48.0 (#9)
| Benchmark | GPT-5.2 | GPT-5.3 Codex |
|---|---|---|
| Terminal-Bench | 64.9% | 78.4% |
| METR Time Horizons | 75.3% | 74.5% |
| Vending-Bench 2 | 3,591 | 5,940 |
| Berkeley Function Calling Leaderboard | 55.9% | — |
| GDPval | 49.7% | — |
| Remote Labor Index | 2.5% | — |
| τ²-bench Airline | 83% | — |
| τ²-bench Banking | 32.2% | — |
| τ²-bench Retail | 81.6% | — |
| τ²-bench Telecom | 89.7% | — |
| DeepResearch Bench | 41.1% | — |
| LMArena Search | 1207 | — |
Reasoning Not comparable
GPT-5.2: 50.2 (#35), GPT-5.3 Codex: —
| Benchmark | GPT-5.2 | GPT-5.3 Codex |
|---|---|---|
| Epoch Capabilities Index | 153.45 | 156.77 |
| ARC-AGI-2 | 52.9% | — |
| SimpleBench | 45.8% | — |
| Kagi LLM Benchmark | 73.3% | — |
| NYT Connections (extended) | 83.6% | — |
| ARC-AGI-1 | 86.2% | — |
| Chess Puzzles | 49% | — |
| EnigmaEval | 10.4% | — |
| EBR-Bench | 23% | — |
| LMArena Hard Prompts | 1445 | — |
| Mystery Game Puzzles | 23% | — |
| DTBench | 90.9% | — |
| LMCA | 43.9% | — |
| ForecastBench | 60.1 | — |
Math Not comparable
GPT-5.2: 60.0 (#38), GPT-5.3 Codex: —
| Benchmark | GPT-5.2 | GPT-5.3 Codex |
|---|---|---|
| FrontierMath (Tiers 1-3) | 67.4% | — |
| FrontierMath Tier 4 | 31.7% | — |
| MathArena Final-Answer Competitions | 72% | — |
| OTIS Mock AIME 2024-2025 | 96.1% | — |
| ProofBench | 15% | — |
| LMArena Math | 1440 | — |
| FrontierMath (Feb 2025 set) | 40.7% | — |
| FrontierMath Tier 4 (v1) | 18.8% | — |
Knowledge Not comparable
GPT-5.2: 59.3 (#32), GPT-5.3 Codex: —
| Benchmark | GPT-5.2 | GPT-5.3 Codex |
|---|---|---|
| GPQA Diamond | 91.4% | — |
| Humanity's Last Exam | 27.8% | — |
| SimpleQA Verified | 37.1% | — |
| Vectara Hallucination Rate | 8.4% | — |
| LMArena Expert | 1445 | — |
Multimodal Not comparable
GPT-5.2: 51.3 (#7), GPT-5.3 Codex: —
| Benchmark | GPT-5.2 | GPT-5.3 Codex |
|---|---|---|
| LMArena Vision | 1268 | — |
| VPCT | 84% | — |
| Furniture Assembly | 38.3% | — |
| LMArena Document | 1405 | — |
Multilingual Not comparable
GPT-5.2: 53.4 (#67), GPT-5.3 Codex: —
| Benchmark | GPT-5.2 | GPT-5.3 Codex |
|---|---|---|
| LMArena Non-English | 1425 | — |
| LMArena Chinese | 1460 | — |
| LMArena French | 1455 | — |
| LMArena German | 1448 | — |
| LMArena Japanese | 1420 | — |
| LMArena Korean | 1392 | — |
| LMArena Russian | 1440 | — |
| LMArena Spanish | 1433 | — |
Instruction Following Not comparable
GPT-5.2: 74.7 (#89), GPT-5.3 Codex: —
| Benchmark | GPT-5.2 | GPT-5.3 Codex |
|---|---|---|
| LMArena Instruction Following | 1417 | — |
Long Context Not comparable
GPT-5.2: 44.0 (#78), GPT-5.3 Codex: —
| Benchmark | GPT-5.2 | GPT-5.3 Codex |
|---|---|---|
| CL-bench | 18.2% | — |
| LMArena Longer Query | 1428 | — |
Writing & Preference Not comparable
GPT-5.2: 66.8 (#32), GPT-5.3 Codex: —
| Benchmark | GPT-5.2 | GPT-5.3 Codex |
|---|---|---|
| LMArena Text | 1439 | — |
| LMArena Creative Writing | 1401 | — |
| EQ-Bench Creative Writing | 1703 | — |
| LMArena Multi-Turn | 1458 | — |
Frequently asked questions
Is GPT-5.2 better than GPT-5.3 Codex?
GPT-5.2 is the stronger model overall, scoring 54.1 to 45.8 on the Noometry Index.
Which is cheaper, GPT-5.2 or GPT-5.3 Codex?
GPT-5.3 Codex is cheaper. It lists at $1.75 per million input tokens and $14 per million output tokens; GPT-5.2 lists at $1.75 and $14.
Is GPT-5.2 or GPT-5.3 Codex better for coding?
GPT-5.2 scores higher on coding benchmarks: 51.6 versus 48.6 in the Noometry coding category.
Which has the bigger context window?
Both accept 400K tokens.
How many benchmarks do GPT-5.2 and GPT-5.3 Codex share?
8 benchmarks have published results for both models. GPT-5.2 has 67 scored results on Noometry and GPT-5.3 Codex has 8.