Model comparison
GPT-5.1-Codex vs GPT-5.2
GPT-5.2 is the stronger model overall, scoring 54.1 to 38.6 on the Noometry Index.
Last verified . 6 shared benchmarks.
Summary
- They share 6 benchmarks with published results for both. GPT-5.1-Codex scores higher in 0 categories and GPT-5.2 in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.2 leads 60.0 to 30.3.
- The biggest single-benchmark swing is SWE-bench Verified (bash only): 66% for GPT-5.1-Codex and 72.8% for GPT-5.2.
- GPT-5.1-Codex is cheaper at $1.25 / $10 per million input/output tokens, against $1.75 / $14 for GPT-5.2.
Side by side
| GPT-5.1-Codex | GPT-5.2 | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 38.6 | 54.1 |
| Released | 2025-11-12 | 2025-12-11 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 400K |
| Max output | 128K | 128K |
| Input $ / M tokens | $1.25 | $1.75 |
| Output $ / M tokens | $10 | $14 |
| Results tracked | 6 | 67 |
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Category by category
Coding GPT-5.2 leads
GPT-5.1-Codex: 41.9 (#116), GPT-5.2: 51.6 (#37)
| Benchmark | GPT-5.1-Codex | GPT-5.2 |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | 72.8% |
| LMArena WebDev | 1337 | 1416 |
| ALE-Bench | 1,245 | 1,294 |
| SWE-bench Verified | — | 73.8% |
| SWE-bench Multilingual | — | 66.7% |
| GSO | — | 27.4% |
| WeirdML | — | 72.2% |
| LMArena Coding | — | 1447 |
| AlgoTune | — | 2.05 |
Agentic & Tool Use GPT-5.2 leads
GPT-5.1-Codex: 38.0 (#33), GPT-5.2: 40.2 (#24)
| Benchmark | GPT-5.1-Codex | GPT-5.2 |
|---|---|---|
| Terminal-Bench | 60.4% | 64.9% |
| METR Time Horizons | 70.8% | 75.3% |
| 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 |
| Vending-Bench 2 | — | 3,591 |
Reasoning Not comparable
GPT-5.1-Codex: —, GPT-5.2: 50.2 (#35)
| Benchmark | GPT-5.1-Codex | GPT-5.2 |
|---|---|---|
| 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% |
| Epoch Capabilities Index | — | 153.45 |
| ForecastBench | — | 60.1 |
Math GPT-5.2 leads
GPT-5.1-Codex: 30.3 (#235), GPT-5.2: 60.0 (#38)
| Benchmark | GPT-5.1-Codex | GPT-5.2 |
|---|---|---|
| ProofBench | 9% | 15% |
| FrontierMath (Tiers 1-3) | — | 67.4% |
| FrontierMath Tier 4 | — | 31.7% |
| MathArena Final-Answer Competitions | — | 72% |
| OTIS Mock AIME 2024-2025 | — | 96.1% |
| LMArena Math | — | 1440 |
| FrontierMath (Feb 2025 set) | — | 40.7% |
| FrontierMath Tier 4 (v1) | — | 18.8% |
Knowledge Not comparable
GPT-5.1-Codex: —, GPT-5.2: 59.3 (#32)
| Benchmark | GPT-5.1-Codex | GPT-5.2 |
|---|---|---|
| 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-5.1-Codex: —, GPT-5.2: 51.3 (#7)
| Benchmark | GPT-5.1-Codex | GPT-5.2 |
|---|---|---|
| LMArena Vision | — | 1268 |
| VPCT | — | 84% |
| Furniture Assembly | — | 38.3% |
| LMArena Document | — | 1405 |
Multilingual Not comparable
GPT-5.1-Codex: —, GPT-5.2: 53.4 (#67)
| Benchmark | GPT-5.1-Codex | GPT-5.2 |
|---|---|---|
| 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-5.1-Codex: —, GPT-5.2: 74.7 (#89)
| Benchmark | GPT-5.1-Codex | GPT-5.2 |
|---|---|---|
| LMArena Instruction Following | — | 1417 |
Long Context Not comparable
GPT-5.1-Codex: —, GPT-5.2: 44.0 (#78)
| Benchmark | GPT-5.1-Codex | GPT-5.2 |
|---|---|---|
| CL-bench | — | 18.2% |
| LMArena Longer Query | — | 1428 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, GPT-5.2: 66.8 (#32)
| Benchmark | GPT-5.1-Codex | GPT-5.2 |
|---|---|---|
| LMArena Text | — | 1439 |
| LMArena Creative Writing | — | 1401 |
| EQ-Bench Creative Writing | — | 1703 |
| LMArena Multi-Turn | — | 1458 |
Frequently asked questions
Is GPT-5.1-Codex better than GPT-5.2?
GPT-5.2 is the stronger model overall, scoring 54.1 to 38.6 on the Noometry Index.
Which is cheaper, GPT-5.1-Codex or GPT-5.2?
GPT-5.1-Codex is cheaper. It lists at $1.25 per million input tokens and $10 per million output tokens; GPT-5.2 lists at $1.75 and $14.
Is GPT-5.1-Codex or GPT-5.2 better for coding?
GPT-5.2 scores higher on coding benchmarks: 51.6 versus 41.9 in the Noometry coding category.
Which has the bigger context window?
Both accept 400K tokens.
How many benchmarks do GPT-5.1-Codex and GPT-5.2 share?
6 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and GPT-5.2 has 67.