Claude Opus 4 and Sonnet 4 are hybrid models offering two modes: near-instant responses and extended thinking for deeper reasoning. The Pro, Max, Team, and Enterprise Claude plans include both models and extended thinking, with Sonnet 4 also available to free users.

Claude Opus 4 and Claude Sonnet 4 are both strong performers, but with distinct strengths. Claude Opus 4 outperforms Sonnet 4 in several key areas: it achieves higher accuracy in terminal coding (50.0% vs. 41.3%), high school math competition ...

October 2, 2025 - Claude 4.1 Opus came out swinging with energy. The opening line—”Let’s talk real talk: You’re not getting replaced by AI”—hits hard and immediately establishes a conversational vibe. It leaned heavily into metaphors (the orchestra conductor theme) and maintained a consistently upbeat, almost motivational speaker energy throughout. Claude 4.5 Sonnet opened with: “Here’s the truth nobody’s saying out loud: Your job isn’t one thing—it’s fifty things wrapped in a fancy title.” Different approach, but equally engaging.

May 29, 2025 - In Anthropic’s nomenclature, Opus denotes the top-tier, most capable model, while Sonnet models aim to balance high intelligence with efficiency. Claude Opus 4 is described as “our most intelligent model to date, pushing the frontier in ...

May 23, 2025 - Compared to Claude Sonnet 3.7, this version is faster, better at following instructions, and more reliable in code-heavy workflows. It supports up to 64K output tokens, which helps with slightly longer outputs like structured plans, multi-part ...

September 23, 2025 - Claude Opus 4 is Anthropic’s flagship model—best for deep reasoning, advanced coding, and long-context tasks. Claude Sonnet 4 is a balanced model—ideal for content generation, support bots, and cost-effective AI use.

Claude Opus 4 leads on the SWE-bench with a score of 72.5% and can reach up to 79.4% with parallel test-time compute. As you can see, there has already been over a 10% improvement over Anthropic’s previous model, Claude 3.7 Sonnet.

If you're unsure which model to use, we recommend starting with Claude Sonnet 4.5.

Opus 4 offers industry-leading reasoning and agentic capabilities, while Sonnet 4 provides an optimal balance of cost and performance for enterprise-scale deployments. With full integration into the Databricks Data Intelligence Platform, enterprise ...

May 27, 2025 - It shares the same massive context window, but under the hood is more advanced (Anthropic calls it their “most intelligent model”). Opus 4 is significantly more expensive to use, reflecting its superior capability in deep reasoning and coding. Both models are accessible via API and major ...

August 2, 2025 - I am curious about feedback and preferences among those who have tried both GPT-4.1 mini and Claude 4. Claude Sonnet 3.7 and more recently Claude Sonnet 4 have been my go-to LLM model for some time for review of academic or professsional documents. I use it to get an overview of very large ...

June 26, 2025 - On SWE-bench, a key software engineering test, Sonnet 4 scores 72.7%, and Opus 4 scores 72.5%. Gemini 2.5 Pro scores 63.8%, while Claude 3.7 Sonnet trails at 62.3%. Claude 4 models seem best for coding tasks.

July 6, 2025 - What are the results, the sensations, the size of the hole in your pocket? Has anyone tried writing a lot of code through it?

September 10, 2025 - I was eager to test these models' ... the TL;DR? Sonnet 4 is a workhorse upgrade that costs the same as before, while Opus 4 is their bet on "what if we made an AI that could finish an entire project."...

May 24, 2025 - For high-compute results, multiple ... tasks are approached at scale. Claude Opus 4 represents a major leap forward in building digital systems that can handle deep, uninterrupted thinking....

June 10, 2025 - Interestingly, Opus 4 and Sonnet ... coding improvements in Claude 4—Opus 4 now matches or exceeds the best open-source and proprietary models on core engineering benchmarks....

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May 25, 2025 - Our results are consistent with Anthropic's claims of state-of-the-art performance with 72.5% on SWE-bench Verified for Opus 4 and 72.7% for Sonnet 4 (default mode, no extended thinking).

May 23, 2025 - Opus is for power users and big projects, while Sonnet balances speed, cost, and performance for everyday coding and AI tasks. For most people, Sonnet will get things done for you.