# Claude 3.5 Sonnet (upgraded)

Claude 3.5 Sonnet (upgraded) is an AI model released by Anthropic on Oct 22 2024. At release it scored 49% on SWE-Bench Verified.

## Facts

| Field | Value |
| --- | --- |
| Model | Claude 3.5 Sonnet (upgraded) |
| Developer | Anthropic |
| Release date | Tuesday, Oct 22 2024 |
| Licensing | Proprietary |

## Benchmark scores published at release

| Benchmark | Score | What it measures |
| --- | --- | --- |
| SWE-Bench Verified | 49% | 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. |

## Questions and answers

### When was Claude 3.5 Sonnet (upgraded) released?

Claude 3.5 Sonnet (upgraded) was released by Anthropic on Tuesday, Oct 22 2024.

### Who made Claude 3.5 Sonnet (upgraded)?

Claude 3.5 Sonnet (upgraded) 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 3.5 Sonnet (upgraded) get?

Claude 3.5 Sonnet (upgraded) reports 1 tracked benchmark score — SWE-Bench Verified: 49%. Scores are the figures published at release by Anthropic.

### Is Claude 3.5 Sonnet (upgraded) open source?

No. Claude 3.5 Sonnet (upgraded) 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 3.5 Sonnet (upgraded)?

Anthropic's previous tracked release was Claude 3.5 Haiku on Oct 22 2024. It was followed by Claude 3.7 Sonnet on Feb 24 2025.


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Canonical page: https://aireleasetracker.com/model/anthropic/claude-3.5-sonnet-(upgraded)
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.