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”
GENERATIVE AI
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Opus 4 vs Sonnet 4: Hybrid models comparison details
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API Pricing Unchanged for Opus 4 and Sonnet 4
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API pricing remains unchanged 🙂
– Opus 4: $15/$75 per million tokens
– Sonnet 4: $3/$15 per million tokens -
Claude 4 Models Now Available on All Paid Plans and Free Plan
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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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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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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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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