Claude Sonnet's Memory Gets A Big Boost With 1m Tokens Of Context

Sabrina Ortiz/ZDNET

ZDNET's cardinal takeaways

• Claude Sonnet 4 now has 1 cardinal discourse tokens.
• As a result, nan exemplary tin process overmuch larger developer tasks.
• Developers tin entree it now, but API pricing does summation for definite requests. 

We each person that friend who is simply a awesome progressive listener and tin callback specifications from past interactions, which past feeds into amended conversations successful nan future. Similarly, AI models person discourse windows that effect really overmuch contented they tin reference -- and Anthropic's Claude Sonnet conscionable sewage a immense upgrade that should fto it do a batch much for you. 

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Claude Sonnet 4 can now support up to 1 cardinal tokens of context, marking a fivefold summation from nan anterior 200,000, Anthropic said connected Tuesday. With this ample discourse window, Claude Sonnet tin process codebases pinch complete 75,000 lines of codification aliases dozens of investigation papers pinch a azygous API request.  

The longer discourse model allows developers to usage Claude for much data-heavy projects, specified arsenic large-scale codification study and archive synthesis, arsenic mentioned above, but besides context-aware agents that require a batch of worldly to run analyzable workflows. 

Anthropic describes Claude Sonnet arsenic a "hybrid reasoning exemplary pinch superior intelligence." ZDNET's own soul testing has recovered it to beryllium a very tin model, moreover outperforming what Anthropic touted astatine nan clip arsenic its astir precocious coding model, Opus 4. Sonnet passed each 4 coding tests while Claude Opus grounded two.

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Developers willing successful trying nan upgraded Sonnet 4 tin entree it successful nationalist beta connected nan Anthropic API arsenic customers pinch Tier 4 and civilization complaint limits. It is besides disposable connected third-party unreality computing platforms, starting pinch Amazon Bedrock, and coming soon to Google Cloud's Vertex AI. The API pricing does summation for prompts complete 200K tokens. 

Since launching nan Claude 4 models successful May, Anthropic has been riding a activity of dependable upward momentum. Claude Code, a instrumentality favourite coding adjunct that tin beryllium called connected straight successful a developer's workspace to constitute aliases negociate code, shipped 10 features successful nan past month, and its highly anticipated Opus 4.1 was released past week. The institution reports that its B2B run-rate gross has grown 17 times YoY arsenic of June 2025.