# Claude 3 Haiku vs GPT-5.2 Codex

> GPT-5.2 Codex is the stronger model overall, scoring 42.2 to 25.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-haiku-vs-gpt-5-2-codex
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-5.2 Codex leads 45.4 to 26.1.

## Snapshot

| | Claude 3 Haiku | GPT-5.2 Codex |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 25.7 | 42.2 |
| Rank | 333 | 107 |
| Context | — | 400K |
| Input $/M | — | $1.75 |
| Output $/M | — | $14 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude 3 Haiku: 26.1 (#320)
- GPT-5.2 Codex: 45.4 (#66)

| Benchmark | Claude 3 Haiku | GPT-5.2 Codex |
|---|---|---|
| SWE-bench Verified (bash only) | — | 72.8% |
| LMArena WebDev | — | 1339 |
| SWE-bench Multilingual | — | 66.3% |
| WeirdML | 9.8% | — |
| BigCodeBench Instruct | 39.4% | — |
| LMArena Coding | 1199 | — |
| BigCodeBench Complete | 50.1% | — |
| CadEval | 12% | — |
| ALE-Bench | — | 1,300 |
| HumanEval+ | 68.9% | — |
| MBPP+ | 68.8% | — |

## Agentic & Tool Use

- Claude 3 Haiku: —
- GPT-5.2 Codex: 40.7 (#20)

| Benchmark | Claude 3 Haiku | GPT-5.2 Codex |
|---|---|---|
| Terminal-Bench | — | 66.5% |

## Reasoning

- Claude 3 Haiku: 15.7 (#303)
- GPT-5.2 Codex: —

| Benchmark | Claude 3 Haiku | GPT-5.2 Codex |
|---|---|---|
| Kagi LLM Benchmark | 34.2% | — |
| LMArena Hard Prompts | 1174 | — |
| DTBench | 50.1% | — |
| LMCA | 8.8% | — |
| Epoch Capabilities Index | 118.3 | — |
| ForecastBench | 53.2 | — |
| WinoGrande | 74.2% | — |

## Math

- Claude 3 Haiku: 9.2 (#313)
- GPT-5.2 Codex: —

| Benchmark | Claude 3 Haiku | GPT-5.2 Codex |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 1.8% | — |
| LMArena Math | 1188 | — |
| MATH Level 5 | 14.9% | — |

## Knowledge

- Claude 3 Haiku: 17.3 (#280)
- GPT-5.2 Codex: —

| Benchmark | Claude 3 Haiku | GPT-5.2 Codex |
|---|---|---|
| GPQA Diamond | 36.3% | — |
| Confabulations | 34.2% | — |
| LMArena Expert | 1148 | — |
| MMLU | 73.8% | — |

## Multimodal

- Claude 3 Haiku: 23.1 (#123)
- GPT-5.2 Codex: —

| Benchmark | Claude 3 Haiku | GPT-5.2 Codex |
|---|---|---|
| LMArena Vision | 950 | — |
| ScienceQA | 72% | — |

## Multilingual

- Claude 3 Haiku: 36.1 (#238)
- GPT-5.2 Codex: —

| Benchmark | Claude 3 Haiku | GPT-5.2 Codex |
|---|---|---|
| LMArena Non-English | 1178 | — |
| LMArena Chinese | 1155 | — |
| LMArena French | 1194 | — |
| LMArena German | 1174 | — |
| LMArena Japanese | 1102 | — |
| LMArena Korean | 1108 | — |
| LMArena Russian | 1204 | — |
| LMArena Spanish | 1165 | — |

## Instruction Following

- Claude 3 Haiku: 61.5 (#242)
- GPT-5.2 Codex: —

| Benchmark | Claude 3 Haiku | GPT-5.2 Codex |
|---|---|---|
| LMArena Instruction Following | 1174 | — |

## Long Context

- Claude 3 Haiku: 36.1 (#232)
- GPT-5.2 Codex: —

| Benchmark | Claude 3 Haiku | GPT-5.2 Codex |
|---|---|---|
| LMArena Longer Query | 1191 | — |

## Writing & Preference

- Claude 3 Haiku: 29.8 (#286)
- GPT-5.2 Codex: —

| Benchmark | Claude 3 Haiku | GPT-5.2 Codex |
|---|---|---|
| LMArena Text | 1195 | — |
| LMArena Creative Writing | 1157 | — |
| EQ-Bench Creative Writing | 717 | — |
| LMArena Multi-Turn | 1190 | — |

## FAQ

### Is Claude 3 Haiku better than GPT-5.2 Codex?

GPT-5.2 Codex is the stronger model overall, scoring 42.2 to 25.7 on the Noometry Index.

### Is Claude 3 Haiku or GPT-5.2 Codex better for coding?

GPT-5.2 Codex scores higher on coding benchmarks: 45.4 versus 26.1 in the Noometry coding category.

### How many benchmarks do Claude 3 Haiku and GPT-5.2 Codex share?

0 benchmarks have published results for both models. Claude 3 Haiku has 37 scored results on Noometry and GPT-5.2 Codex has 5.