Introducing the next generation: Claude Opus 4 and Claude Sonnet 4....
Anthropic@AnthropicAI
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May 22, 2025
~1 min read
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Introducing the next generation: Claude Opus 4 and Claude Sonnet 4.
Claude Opus 4 is our most powerful model yet, and the world’s best coding model.
Claude Sonnet 4 is a significant upgrade from its predecessor, delivering superior coding and reasoning.
Claude Opus 4 is our most powerful model yet, and the world’s best coding model.
Claude Sonnet 4 is a significant upgrade from its predecessor, delivering superior coding and reasoning.
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Claude Opus 4 and Sonnet 4 are hybrid models offering two modes: near-instant responses and extended thinking for deeper reasoning.
Both models can also alternate between reasoning and tool use—like web search—to improve responses.
Both models can also alternate between reasoning and tool use—like web search—to improve responses.
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Both Claude 4 models are state-of-the-art on SWE-bench Verified, which measures how models solve real software issues.
As the best coding model, Claude Opus 4 can work continuously for hours on complex, long-running tasks—significantly expanding what AI agents can do.
As the best coding model, Claude Opus 4 can work continuously for hours on complex, long-running tasks—significantly expanding what AI agents can do.
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Claude Sonnet 4 is a significant upgrade to Claude Sonnet 3.7.
It delivers superior coding and reasoning, all while offering greater control over how eagerly it implements changes.
It delivers superior coding and reasoning, all while offering greater control over how eagerly it implements changes.
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Claude Code is now generally available.
We're bringing Claude to more of your development workflow—in the terminal, your favorite IDEs, and running in the background with the Claude Code SDK.
We're bringing Claude to more of your development workflow—in the terminal, your favorite IDEs, and running in the background with the Claude Code SDK.
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But it's not just coding.
Claude 4 models operate with sustained focus and full context via deep integrations.
Watch our team work through a full day with Claude, conducting extended research, prototyping applications, and orchestrating complex project plans.
Claude 4 models operate with sustained focus and full context via deep integrations.
Watch our team work through a full day with Claude, conducting extended research, prototyping applications, and orchestrating complex project plans.
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Both Claude 4 models are available today for all paid plans. Additionally, Claude Sonnet 4 is available on the free plan.
For even more details, see the full announcement: anthropic.com/news/claude-4.
For even more details, see the full announcement: anthropic.com/news/claude-4.
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Our docs are taking a little while to update.
The new model names on the Anthropic API are:
`claude-opus-4-20250514`
`claude-sonnet-4-20250514`
The new model names on the Anthropic API are:
`claude-opus-4-20250514`
`claude-sonnet-4-20250514`