Sonnet 4 is available in Cursor! We've been very impressed by its coding ability. It is much easier to control than 3.7 and is excellent at understanding codebases. It appears to be a new state of the art.
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Opus 4 vs Sonnet 4: Hybrid models comparison details
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Adding more details as they come: —Both models are hybrid models
—Opus 4 is great at understanding codebases and “the right choice” for agentic workflows
—Sonnet 4 excels at everyday tasks, and is your “daily go to” -
New Models Improve Instruction Following and Reduce Reward Hacking
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We've addressed the quirks from previous models head-on. Significantly reduced reward hacking in code generation. Better instruction following. Less overeager responses. These models do what you ask, how you ask.
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Claude 4 Alternates Between Thinking and Tool Calls
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Claude 4 is able to alternate between thinking and tool calls as well, in both claude dot ai and the API. We’ve seen this greatly improve Claude’s performance and tool calling ability.
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Sonnet 4: New Workhorse Model with State-of-the-Art Performance
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Now onto Sonnet 4 – our new workhorse. State-of-the-art SWE-Bench Verified score. Dramatically improved function calling. This is a true drop-in replacement for Sonnet 3.5, and you can expect immediate performance gains across the board.
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Anthropic Unveils Claude 4 Opus and Sonnet with 7-Hour Autonomous Coding
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It’s happening Anthropic just announced Claude 4 Opus and Claude 4 Sonnet just now at the Code with Claude event Early testers said it could code autonomously for up to seven hours
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Claude 4 Extended Focus: Full Day Workflow Demonstration
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But it's not just coding.
— Anthropic (@AnthropicAI) 22 mai 2025
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. pic.twitter.com/4kPpDiKf2aBut 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.
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Claude Sonnet 4: Superior Coding and Reasoning Capabilities
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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.
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Claude Code Now Generally Available for Developers
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Claude Code is now generally available.
— Anthropic (@AnthropicAI) 22 mai 2025
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. pic.twitter.com/K8YO177sHLClaude 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.
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Claude Opus 4 Advances Coding and AI Agent Capabilities
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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.