Model comparison
Claude 3 Sonnet vs GPT-5.2 Codex
GPT-5.2 Codex is the stronger model overall, scoring 42.6 to 29.0 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in coding, where GPT-5.2 Codex leads 45.5 to 29.6.
Side by side
| Claude 3 Sonnet | GPT-5.2 Codex | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 29.0 | 42.6 |
| Released | 2024-02-29 | 2025-12-18 |
| Weights | Proprietary | Proprietary |
| Context window | — | 400K |
| Max output | — | 128K |
| Input $ / M tokens | — | $1.75 |
| Output $ / M tokens | — | $14 |
| Results tracked | 30 | 5 |
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Category by category
Coding GPT-5.2 Codex leads
Claude 3 Sonnet: 29.6 (#302), GPT-5.2 Codex: 45.5 (#71)
| Benchmark | Claude 3 Sonnet | GPT-5.2 Codex |
|---|---|---|
| SWE-bench Verified (bash only) | — | 72.8% |
| LMArena WebDev | — | 1339 |
| SWE-bench Multilingual | — | 66.3% |
| WeirdML | 10.2% | — |
| BigCodeBench Instruct | 42.7% | — |
| LMArena Coding | 1223 | — |
| BigCodeBench Complete | 53.8% | — |
| ALE-Bench | — | 1,300 |
| HumanEval+ | 64% | — |
| MBPP+ | 69.3% | — |
Agentic & Tool Use Not comparable
Claude 3 Sonnet: —, GPT-5.2 Codex: 41.0 (#22)
| Benchmark | Claude 3 Sonnet | GPT-5.2 Codex |
|---|---|---|
| Terminal-Bench | — | 66.5% |
Reasoning Not comparable
Claude 3 Sonnet: 20.5 (#237), GPT-5.2 Codex: —
| Benchmark | Claude 3 Sonnet | GPT-5.2 Codex |
|---|---|---|
| LMArena Hard Prompts | 1197 | — |
| DTBench | 53.6% | — |
| Epoch Capabilities Index | 120.7 | — |
| WinoGrande | 75.1% | — |
Math Not comparable
Claude 3 Sonnet: 10.7 (#310), GPT-5.2 Codex: —
| Benchmark | Claude 3 Sonnet | GPT-5.2 Codex |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | — |
| LMArena Math | 1213 | — |
| MATH Level 5 | 18.2% | — |
Knowledge Not comparable
Claude 3 Sonnet: 21.1 (#276), GPT-5.2 Codex: —
| Benchmark | Claude 3 Sonnet | GPT-5.2 Codex |
|---|---|---|
| GPQA Diamond | 40.6% | — |
| LMArena Expert | 1173 | — |
| MMLU | 75.9% | — |
Multimodal Not comparable
Claude 3 Sonnet: 25.2 (#125), GPT-5.2 Codex: —
| Benchmark | Claude 3 Sonnet | GPT-5.2 Codex |
|---|---|---|
| LMArena Vision | 984 | — |
Multilingual Not comparable
Claude 3 Sonnet: 37.8 (#234), GPT-5.2 Codex: —
| Benchmark | Claude 3 Sonnet | GPT-5.2 Codex |
|---|---|---|
| LMArena Non-English | 1205 | — |
| LMArena Chinese | 1189 | — |
| LMArena French | 1229 | — |
| LMArena German | 1204 | — |
| LMArena Japanese | 1131 | — |
| LMArena Korean | 1128 | — |
| LMArena Russian | 1227 | — |
| LMArena Spanish | 1204 | — |
Instruction Following Not comparable
Claude 3 Sonnet: 62.8 (#235), GPT-5.2 Codex: —
| Benchmark | Claude 3 Sonnet | GPT-5.2 Codex |
|---|---|---|
| LMArena Instruction Following | 1199 | — |
Long Context Not comparable
Claude 3 Sonnet: 36.7 (#228), GPT-5.2 Codex: —
| Benchmark | Claude 3 Sonnet | GPT-5.2 Codex |
|---|---|---|
| LMArena Longer Query | 1211 | — |
Writing & Preference Not comparable
Claude 3 Sonnet: 42.1 (#238), GPT-5.2 Codex: —
| Benchmark | Claude 3 Sonnet | GPT-5.2 Codex |
|---|---|---|
| LMArena Text | 1218 | — |
| LMArena Creative Writing | 1186 | — |
| LMArena Multi-Turn | 1227 | — |
Frequently asked questions
Is Claude 3 Sonnet better than GPT-5.2 Codex?
GPT-5.2 Codex is the stronger model overall, scoring 42.6 to 29.0 on the Noometry Index.
Is Claude 3 Sonnet or GPT-5.2 Codex better for coding?
GPT-5.2 Codex scores higher on coding benchmarks: 45.5 versus 29.6 in the Noometry coding category.
How many benchmarks do Claude 3 Sonnet and GPT-5.2 Codex share?
0 benchmarks have published results for both models. Claude 3 Sonnet has 30 scored results on Noometry and GPT-5.2 Codex has 5.