Claude 3.5 Sonnet
Released
Claude 3.5 Sonnet is an AI model released by Anthropic on Thursday, Jun 20 2024, 108 days after Claude 3 Opus. Benchmark results (shown below) cover BullshitBench v2, SWE-Bench Verified, and GPQA Diamond.
Benchmarks
Coding
Reasoning & science
Robustness
About
Claude 3.5 Sonnet, released June 20, 2024, was the model that made Claude a default choice for developers. Despite being a mid-tier model, it outperformed the larger Claude 3 Opus while running roughly twice as fast at a fraction of the cost, and its coding and vision abilities set a new bar for the price point. It launched together with Artifacts in the Claude app, which turned chat output into live, editable documents and code.
On benchmarks it jumped to 59.4% on GPQA Diamond — nine points over Opus — and it became the base of one of the most-used model lines in AI-assisted programming. An upgraded version followed on October 22, 2024, lifting SWE-Bench Verified to 49.0% and introducing computer use, before Claude 3.7 Sonnet succeeded the line in February 2025.
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Frequently asked questions
Claude 3.5 Sonnet was released by Anthropic on Thursday, Jun 20 2024.
Claude 3.5 Sonnet was built by Anthropic. AI safety company building the Claude family of models. Founded in 2021 by former OpenAI researchers.
Claude 3.5 Sonnet reports 3 tracked benchmark scores — BullshitBench v2: 45%; SWE-Bench Verified: 33.4%; GPQA Diamond: 59.4%. Scores are the figures published at release by Anthropic.
No. Claude 3.5 Sonnet is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.
Anthropic's previous tracked release was Claude 3 Opus on Mar 4 2024, 108 days earlier. It was followed by Claude 3.5 Haiku on Oct 22 2024.