# Claude 3 Opus

Claude 3 Opus is an AI model released by Anthropic on Mar 4 2024. At release it scored 50.4% on GPQA Diamond and 33% on SWE-Bench Verified.

## Facts

| Field | Value |
| --- | --- |
| Model | Claude 3 Opus |
| Developer | Anthropic |
| Release date | Monday, Mar 4 2024 |
| Licensing | Proprietary |

## Benchmark scores published at release

| Benchmark | Score | Source | What it measures |
| --- | --- | --- | --- |
| SWE-Bench Verified | 33% | Lab | Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. |
| GPQA Diamond | 50.4% | Lab | Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. |

## About Claude 3 Opus

Claude 3 Opus was the flagship of the Claude 3 family, launched on March 4, 2024 alongside the faster Claude 3 Sonnet and Claude 3 Haiku. It was the first Claude generation with vision support, shipped with a 200K-token context window, and outperformed GPT-4 on a wide range of benchmarks at launch — a moment that established Anthropic as a genuine frontier-lab rival rather than a safety-focused also-ran.

Opus was marketed on graduate-level reasoning: it scored 50.4% on GPQA Diamond and 33.0% on SWE-Bench Verified, both leading numbers for early 2024. It remained Anthropic's largest model for over a year, until the Claude 4 generation arrived in May 2025, and its three-tier Haiku/Sonnet/Opus naming scheme still structures the Claude lineup today.

## Questions and answers

### When was Claude 3 Opus released?

Claude 3 Opus was released by Anthropic on Monday, Mar 4 2024.

### Who made Claude 3 Opus?

Claude 3 Opus was built by Anthropic. AI safety company building the Claude family of models. Founded in 2021 by former OpenAI researchers.

### What benchmark scores did Claude 3 Opus get?

Claude 3 Opus reports 2 tracked benchmark scores — SWE-Bench Verified: 33%; GPQA Diamond: 50.4%. Scores are the figures published at release by Anthropic.

### Is Claude 3 Opus open source?

No. Claude 3 Opus is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

### What came before and after Claude 3 Opus?

Anthropic's previous tracked release was Claude 3 Sonnet on Mar 4 2024. It was followed by Claude 3.5 Sonnet on Jun 20 2024.


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Canonical page: https://aireleasetracker.com/model/anthropic/claude-3-opus
Full dataset: https://aireleasetracker.com/llms-full.txt · JSON: https://aireleasetracker.com/models.json
Source: AI Release Tracker (https://aireleasetracker.com). Benchmark scores are the figures published by the releasing lab at launch.