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Claude Sonnet 4

Claude Sonnet 4 supports a context window of 1M tokens on Vercel AI Gateway, enabling full codebase analysis of 75,000+ lines or large document sets, while scoring 72.7% on SWE-bench Verified with hybrid extended thinking and enhanced steerability.

File InputReasoningTool UseVision (Image)Explicit Caching
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'anthropic/claude-sonnet-4',
  prompt: 'Why is the sky blue?'
})
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Frequently Asked Questions

  • How do I enable the context window of 1M tokens for Claude Sonnet 4 on AI Gateway?

    Add the anthropic-beta: context-1m-2025-08-07 header to your request. Under providerOptions.gateway, set only to ['anthropic'] so the request routes through the Anthropic provider, which supports the feature.

  • What does the context window of 1M tokens enable in practice?

    The context window of 1M tokens lets you process entire codebases, long documents, or extended conversation histories in a single request. This is particularly useful for code review across multiple files, document analysis, and agentic workflows that accumulate context over many steps.

  • How did Claude Sonnet 4 perform on SWE-bench Verified?

    72.7% on SWE-bench Verified, matching or exceeding Claude Opus 4's 72.5% on that specific benchmark.

  • What is enhanced steerability in Claude Sonnet 4?

    Sonnet 4 responds more precisely to instructions, reducing misinterpretation of complex or nuanced prompts. Anthropic highlighted steerability as an explicit design improvement for applications where exact specification of behavior matters.

  • Does Claude Sonnet 4 support extended thinking?

    Yes. Sonnet 4 is a hybrid model that supports both near-instant responses and extended thinking. Extended thinking with tool use, where the model alternates between reasoning and calling tools, is also available in beta.

  • What is 1-hour prompt caching and does Sonnet 4 support it?

    Yes. The Claude 4 launch introduced one-hour prompt caching as a new API capability, compared to shorter-lived caching in previous generations. This is particularly useful for codebases or large system prompts that appear in many requests.

  • Why would I use Sonnet 4 instead of Opus 4 given the SWE-bench scores are similar?

    Claude Sonnet 4 is priced at the Sonnet tier, while Opus 4 is priced at the Opus tier. When benchmark results are comparable, the cost gap determines the choice at scale. Check the pricing panel on this page for current rates.