# Claude Opus 4.1 vs GPT-5.3 Chat

> GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 41.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-opus-4-1-vs-gpt-5-3-chat
- Last updated: 2026-10-12
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Claude Opus 4.1 scores higher in 6 categories and GPT-5.3 Chat in 2 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.3 Chat leads 38.2 to 22.3.
- GPT-5.3 Chat is cheaper at $1.75 / $14 per million input/output tokens, against $15 / $75 for Claude Opus 4.1.
- Claude Opus 4.1 accepts more context: 200K tokens versus 128K.

## Snapshot

| | Claude Opus 4.1 | GPT-5.3 Chat |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 41.0 | 42.8 |
| Rank | 142 | 109 |
| Context | 200K | 128K |
| Input $/M | $15 | $1.75 |
| Output $/M | $75 | $14 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Opus 4.1: 44.4 (#73)
- GPT-5.3 Chat: 41.4 (#124)

| Benchmark | Claude Opus 4.1 | GPT-5.3 Chat |
|---|---|---|
| LMArena Coding | 1479 | 1408 |
| SWE-bench Verified | 73.3% | — |
| LMArena WebDev | 1390 | — |
| WeirdML | 45.9% | — |
| ALE-Bench | 674.77 | — |
| AlgoTune | 1.34 | — |

## Agentic & Tool Use

- Claude Opus 4.1: 35.0 (#41)
- GPT-5.3 Chat: —

| Benchmark | Claude Opus 4.1 | GPT-5.3 Chat |
|---|---|---|
| Terminal-Bench | 38% | — |
| GDPval | 43.6% | — |
| Cybench | 42% | — |
| DeepResearch Bench | 48.3% | — |
| LMArena Search | 1148 | — |
| METR Time Horizons | 66.8% | — |

## Reasoning

- Claude Opus 4.1: 32.2 (#76)
- GPT-5.3 Chat: 28.5 (#102)

| Benchmark | Claude Opus 4.1 | GPT-5.3 Chat |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1399 |
| SimpleBench | 60% | — |
| Chess Puzzles | 7% | — |
| EnigmaEval | 7.2% | — |
| EBR-Bench | 7.9% | — |
| Mystery Game Puzzles | 21% | — |
| DTBench | 80% | — |
| LMCA | 37.1% | — |
| Epoch Capabilities Index | 144.12 | — |
| ForecastBench | 62 | — |

## Math

- Claude Opus 4.1: 22.3 (#277)
- GPT-5.3 Chat: 38.2 (#142)

| Benchmark | Claude Opus 4.1 | GPT-5.3 Chat |
|---|---|---|
| LMArena Math | 1431 | 1389 |
| FrontierMath (Tiers 1-3) | 12.6% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.9% | — |
| FrontierMath (Feb 2025 set) | 7.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |

## Knowledge

- Claude Opus 4.1: 42.0 (#101)
- GPT-5.3 Chat: 38.8 (#140)

| Benchmark | Claude Opus 4.1 | GPT-5.3 Chat |
|---|---|---|
| LMArena Expert | 1439 | 1397 |
| GPQA Diamond | 77.3% | — |
| Humanity's Last Exam | 11.5% | — |
| Confabulations | 17.1% | — |
| Vectara Hallucination Rate | 11.8% | — |

## Multimodal

- Claude Opus 4.1: 26.8 (#119)
- GPT-5.3 Chat: —

| Benchmark | Claude Opus 4.1 | GPT-5.3 Chat |
|---|---|---|
| VPCT | 35% | — |

## Multilingual

- Claude Opus 4.1: 52.0 (#95)
- GPT-5.3 Chat: 50.3 (#124)

| Benchmark | Claude Opus 4.1 | GPT-5.3 Chat |
|---|---|---|
| LMArena Non-English | 1405 | 1382 |
| LMArena Chinese | 1427 | 1432 |
| LMArena French | 1431 | 1397 |
| LMArena German | 1413 | 1384 |
| LMArena Japanese | 1378 | 1352 |
| LMArena Korean | 1380 | 1346 |
| LMArena Russian | 1422 | 1400 |
| LMArena Spanish | 1448 | 1371 |

## Instruction Following

- Claude Opus 4.1: 75.6 (#58)
- GPT-5.3 Chat: 72.8 (#129)

| Benchmark | Claude Opus 4.1 | GPT-5.3 Chat |
|---|---|---|
| LMArena Instruction Following | 1435 | 1378 |

## Long Context

- Claude Opus 4.1: 44.5 (#63)
- GPT-5.3 Chat: 42.6 (#120)

| Benchmark | Claude Opus 4.1 | GPT-5.3 Chat |
|---|---|---|
| LMArena Longer Query | 1455 | 1396 |

## Writing & Preference

- Claude Opus 4.1: 62.4 (#74)
- GPT-5.3 Chat: 63.1 (#68)

| Benchmark | Claude Opus 4.1 | GPT-5.3 Chat |
|---|---|---|
| LMArena Text | 1419 | 1389 |
| LMArena Creative Writing | 1412 | 1355 |
| LMArena Multi-Turn | 1444 | 1412 |
| Short-Story Creative Writing | 84.7% | — |
| EQ-Bench Creative Writing | — | 1690 |

## FAQ

### Is Claude Opus 4.1 better than GPT-5.3 Chat?

GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 41.0 on the Noometry Index.

### Which is cheaper, Claude Opus 4.1 or GPT-5.3 Chat?

GPT-5.3 Chat is cheaper. It lists at $1.75 per million input tokens and $14 per million output tokens; Claude Opus 4.1 lists at $15 and $75.

### Is Claude Opus 4.1 or GPT-5.3 Chat better for coding?

Claude Opus 4.1 scores higher on coding benchmarks: 44.4 versus 41.4 in the Noometry coding category.

### Which has the bigger context window?

Claude Opus 4.1 does, with 200K tokens against 128K.

### How many benchmarks do Claude Opus 4.1 and GPT-5.3 Chat share?

17 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and GPT-5.3 Chat has 18.