Model comparison
Claude 2 vs GPT-5-Codex
GPT-5-Codex is the stronger model overall, scoring 37.3 to 24.7 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in reasoning, where GPT-5-Codex leads 30.0 to 20.8.
Side by side
| Claude 2 | GPT-5-Codex | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 24.7 | 37.3 |
| Released | 2023-07-11 | 2025-09-15 |
| Weights | Proprietary | Proprietary |
| Context window | — | 400K |
| Max output | — | 128K |
| Input $ / M tokens | — | $1.25 |
| Output $ / M tokens | — | $10 |
| Results tracked | 8 | 3 |
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Category by category
Coding Not comparable
Claude 2: —, GPT-5-Codex: 41.9 (#100)
| Benchmark | Claude 2 | GPT-5-Codex |
|---|---|---|
| WeirdML | — | 54.5% |
| HumanEval+ | 61.6% | — |
Agentic & Tool Use Not comparable
Claude 2: —, GPT-5-Codex: 30.8 (#66)
| Benchmark | Claude 2 | GPT-5-Codex |
|---|---|---|
| Terminal-Bench | — | 44.3% |
Reasoning GPT-5-Codex leads
Claude 2: 20.8 (#213), GPT-5-Codex: 30.0 (#80)
| Benchmark | Claude 2 | GPT-5-Codex |
|---|---|---|
| Kagi LLM Benchmark | — | 70.3% |
| DTBench | 51.9% | — |
| Epoch Capabilities Index | 120.08 | — |
Math Not comparable
Claude 2: 8.7 (#314), GPT-5-Codex: —
| Benchmark | Claude 2 | GPT-5-Codex |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | — |
| MATH Level 5 | 11.7% | — |
Knowledge Not comparable
Claude 2: 17.0 (#282), GPT-5-Codex: —
| Benchmark | Claude 2 | GPT-5-Codex |
|---|---|---|
| GPQA Diamond | 34.7% | — |
| MMLU | 78.5% | — |
| TriviaQA | 87.5% | — |
Frequently asked questions
Is Claude 2 better than GPT-5-Codex?
GPT-5-Codex is the stronger model overall, scoring 37.3 to 24.7 on the Noometry Index.
How many benchmarks do Claude 2 and GPT-5-Codex share?
0 benchmarks have published results for both models. Claude 2 has 8 scored results on Noometry and GPT-5-Codex has 3.