Both Claude 4 models are available today for all paid plans in claude dot ai. Additionally, Sonnet 4 is available on the free plan. Read more here:
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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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Opus 4 Returns: Advanced Model with Superior Conversational Nuance
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Let's start with Opus 4. It’s finally back and it's better than ever. This model picks up on the subtlest nuances in conversation. Every interaction I’ve had with it feels more natural and intuitive than with any other model I’ve used.
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Opus 4 Redefines AI Agent Capabilities in Production Environments
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Opus 4 also excels at agentic tasks. Combined with our advances in memory training and context handling, it will redefine what AI agents can actually accomplish in production.
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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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Introduction of Claude Opus 4 and Claude Sonnet 4 Models
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Introducing Claude Opus 4 and Claude Sonnet 4. Our best models yet. The Claude 4 family is here.
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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 Models Now Available for All Paid 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: http://
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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.