Scoring 72.7% on SWE-bench Verified at launch, Sonnet 4 introduced extended thinking for step-by-step problem decomposition and parallel tool execution within a 200K context window. Subsequent updates at the same $3/$15 price point pushed agentic coding to 77.2% (Sonnet 4.5) and 79.6% (Sonnet 4.6), establishing the Sonnet tier as Anthropic's fastest-improving model line.
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Claude Sonnet 4 outperforms the original GPT-4 on most benchmarks and is competitive with newer models like GPT-4o and GPT-4.1. It is particularly strong on coding and instruction-following tasks where nuanced understanding of context matters.
Claude Sonnet 4 is Anthropic's flagship production model, released in May 2025 as part of the Claude 4 model family. It balances strong reasoning capability with practical latency and cost for real-world deployments.
Claude Sonnet 4 scores 86.5% on MMLU and 72.7% on SWE-bench Verified at launch, placing it between GPT-4 Turbo (86.5% MMLU) and Claude 3.7 Sonnet (86.1% MMLU) on general knowledge while significantly outperforming both on coding tasks. Subsequent updates at the same price point pushed SWE-bench to 79.6% (Sonnet 4.6), making it the fastest-improving model line at this tier.
Running Claude Sonnet 4 through Telnyx Inference costs $3.00 per million input tokens and $15.00 per million output tokens. Analyzing 1,000,000 code reviews at 2,000 tokens each would cost approximately $18,000, roughly 40% less than Claude Opus 4.6 ($25,000) for workloads where Sonnet-tier reasoning is sufficient.
Claude Sonnet 4 excels due to Anthropic's focus on instruction following, reduced hallucination, and strong performance on agentic coding tasks. It consistently ranks among the top models on SWE-bench and other coding benchmarks, making it a preferred choice for developer workflows.
Claude Sonnet 4 is available for free with usage limits on claude.ai, and through the API at $3 per million input tokens and $15 per million output tokens. Infrastructure providers like Telnyx offer API access with co-located inference for reduced latency.
Claude Sonnet 4 is free with usage limits on claude.ai. API access requires a paid account, with pricing at $3/$15 per million tokens for input/output. Hosted inference platforms provide alternative access points with their own pricing.
Claude Sonnet 4 generally outperforms Grok on coding benchmarks, particularly on SWE-bench Verified and agentic coding tasks. Grok has strengths in real-time information access, but for code generation and refactoring, Claude Sonnet 4 is the stronger choice.
Claude and ChatGPT each have advantages depending on the task. Claude Sonnet 4 tends to excel on coding, writing, and instruction following, while ChatGPT (GPT-5) has broader tool integration with web search, image generation, and plugins.
