Model comparison
GLM-5.2 vs GPT-5.3 Codex
GLM-5.2 is the stronger model overall, scoring 51.1 to 45.8 on the Noometry Index.
Last verified . 6 shared benchmarks.
Summary
- They share 6 benchmarks with published results for both. GLM-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 32.4.
- The biggest single-benchmark swing is WeirdML: 70.1% for GLM-5.2 and 79.3% for GPT-5.3 Codex.
- GLM-5.2 is cheaper at $1.40 / $4.40 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Codex.
- GLM-5.2 accepts more context: 1M tokens versus 400K.
- GLM-5.2 has downloadable open weights; the other is API-only.
Side by side
| GLM-5.2 | GPT-5.3 Codex | |
|---|---|---|
| Provider | Z.ai (Zhipu) | OpenAI |
| Noometry Index | 51.1 | 45.8 |
| Released | 2026-06-13 | 2026-02-05 |
| Weights | Open | Proprietary |
| Context window | 1M | 400K |
| Max output | 131K | 128K |
| Input $ / M tokens | $1.40 | $1.75 |
| Output $ / M tokens | $4.40 | $14 |
| Results tracked | 51 | 8 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding GLM-5.2 leads
GLM-5.2: 51.3 (#41), GPT-5.3 Codex: 48.6 (#56)
| Benchmark | GLM-5.2 | GPT-5.3 Codex |
|---|---|---|
| SWE-bench Verified | 78.7% | 74.8% |
| LMArena WebDev | 1603 | 1409 |
| WeirdML | 70.1% | 79.3% |
| ALE-Bench | 1,047 | 1,655 |
| DeepSWE | 43.8% | — |
| FrontierCode | 24.5% | — |
| SciCode | 50.5% | — |
| LMArena Coding | 1485 | — |
Agentic & Tool Use GPT-5.3 Codex leads
GLM-5.2: 32.4 (#63), GPT-5.3 Codex: 48.0 (#9)
| Benchmark | GLM-5.2 | GPT-5.3 Codex |
|---|---|---|
| Vending-Bench 2 | 8,314 | 5,940 |
| Terminal-Bench | — | 78.4% |
| APEX-Agents | 45.2% | — |
| τ²-bench Banking | 37.1% | — |
| PostTrainBench | 31.7% | — |
| GBAEval | 0% | — |
| METR Time Horizons | — | 74.5% |
Reasoning Not comparable
GLM-5.2: 42.3 (#52), GPT-5.3 Codex: —
| Benchmark | GLM-5.2 | GPT-5.3 Codex |
|---|---|---|
| Epoch Capabilities Index | 151.78 | 156.77 |
| ARC-AGI-2 | 22.8% | — |
| SimpleBench | 58.8% | — |
| Kagi LLM Benchmark | 62.6% | — |
| NYT Connections (extended) | 74.3% | — |
| ARC-AGI-1 | 77% | — |
| CritPt | 20.9% | — |
| Chess Puzzles | 21% | — |
| EBR-Bench | 9.5% | — |
| LMArena Hard Prompts | 1480 | — |
| Mystery Game Puzzles | 19% | — |
| DTBench | 93.6% | — |
| LMCA | 45.8% | — |
| Surface Evolver Bench | 55.6% | — |
Math Not comparable
GLM-5.2: 55.7 (#43), GPT-5.3 Codex: —
| Benchmark | GLM-5.2 | GPT-5.3 Codex |
|---|---|---|
| FrontierMath (Tiers 1-3) | 59.2% | — |
| FrontierMath Tier 4 | 29.3% | — |
| MathArena Final-Answer Competitions | 67.6% | — |
| OTIS Mock AIME 2024-2025 | 86.4% | — |
| ProofBench | 35% | — |
| LMArena Math | 1482 | — |
Knowledge Not comparable
GLM-5.2: 57.1 (#40), GPT-5.3 Codex: —
| Benchmark | GLM-5.2 | GPT-5.3 Codex |
|---|---|---|
| GPQA Diamond | 91.9% | — |
| SimpleQA Verified | 34.2% | — |
| LMArena Expert | 1486 | — |
Multilingual Not comparable
GLM-5.2: 55.8 (#26), GPT-5.3 Codex: —
| Benchmark | GLM-5.2 | GPT-5.3 Codex |
|---|---|---|
| LMArena Non-English | 1459 | — |
| LMArena Chinese | 1519 | — |
| LMArena French | 1479 | — |
| LMArena German | 1468 | — |
| LMArena Japanese | 1451 | — |
| LMArena Korean | 1445 | — |
| LMArena Russian | 1466 | — |
| LMArena Spanish | 1477 | — |
Instruction Following Not comparable
GLM-5.2: 76.9 (#34), GPT-5.3 Codex: —
| Benchmark | GLM-5.2 | GPT-5.3 Codex |
|---|---|---|
| LMArena Instruction Following | 1465 | — |
Long Context Not comparable
GLM-5.2: 45.3 (#43), GPT-5.3 Codex: —
| Benchmark | GLM-5.2 | GPT-5.3 Codex |
|---|---|---|
| LMArena Longer Query | 1479 | — |
Writing & Preference Not comparable
GLM-5.2: 70.4 (#21), GPT-5.3 Codex: —
| Benchmark | GLM-5.2 | GPT-5.3 Codex |
|---|---|---|
| LMArena Text | 1470 | — |
| LMArena Creative Writing | 1462 | — |
| EQ-Bench Creative Writing | 1757 | — |
| EQ-Bench 4 | 1222 | — |
| LMArena Multi-Turn | 1469 | — |
Frequently asked questions
Is GLM-5.2 better than GPT-5.3 Codex?
GLM-5.2 is the stronger model overall, scoring 51.1 to 45.8 on the Noometry Index.
Which is cheaper, GLM-5.2 or GPT-5.3 Codex?
GLM-5.2 is cheaper. It lists at $1.40 per million input tokens and $4.40 per million output tokens; GPT-5.3 Codex lists at $1.75 and $14.
Is GLM-5.2 or GPT-5.3 Codex better for coding?
GLM-5.2 scores higher on coding benchmarks: 51.3 versus 48.6 in the Noometry coding category.
Which has the bigger context window?
GLM-5.2 does, with 1M tokens against 400K.
How many benchmarks do GLM-5.2 and GPT-5.3 Codex share?
6 benchmarks have published results for both models. GLM-5.2 has 51 scored results on Noometry and GPT-5.3 Codex has 8.