Claude 3 Opus
Released
Claude 3 Opus is an AI model released by Anthropic on Monday, Mar 4 2024, the same day as Claude 3 Sonnet. Benchmark results (shown below) cover SWE-Bench Verified, and GPQA Diamond.
Benchmarks
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Reasoning & science
About
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.
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Frequently asked questions
Claude 3 Opus was released by Anthropic on Monday, Mar 4 2024.
Claude 3 Opus was built by Anthropic. AI safety company building the Claude family of models. Founded in 2021 by former OpenAI researchers.
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.
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.
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.