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The cache read and write multipliers are identical on both models, so the break-even point is the same. What differs is the minimum cacheable prefix (1,024 vs 4,096 tokens), the per-token dollar savings, and a new Opus 4.7 tokenizer that counts up to 35% more tokens. With claude-sonnet-4-6 and claude-opus-4-7 pricing math.

Two ways to call Claude from C#: the official Anthropic .NET SDK directly, or the provider-neutral Microsoft.Extensions.AI IChatClient that wraps it. When each wins, what you lose at the abstraction boundary, and why it is not actually either/or. With claude-opus-4-8 and claude-sonnet-4-6 examples.

Anthropic shipped a free security-guidance plugin for Claude Code that scans the agent's own edits for vulnerabilities in three layers, from a no-cost pattern match to an agentic review on commit.

Swashbuckle is gone from the ASP.NET Core templates. Here is how to generate and serve an OpenAPI document in .NET 11 with the built-in Microsoft.AspNetCore.OpenApi package: AddOpenApi, MapOpenApi, transformers, multiple documents, build-time generation, and a UI on top.

Stamp CreatedBy/ModifiedOn columns and write a full change-trail with an ISaveChangesInterceptor in EF Core 11, including the DI lifetime, current-user, and ExecuteUpdate gotchas.

At Build 2026 GitHub shipped Copilot SDK 1.0 GA with a first-class .NET package. You can now drive the same planning, tool-calling, and multi-turn agent runtime from C# code, BYOK included.

A complete guide to structuring minimal APIs in ASP.NET Core 11 with MapGroup: per-resource endpoint modules as extension methods, nested groups, shared filters and auth, route-parameter prefixes, OpenAPI tags, and the filter-ordering rules that surprise people.

Wire HybridCache to a Redis L2 in ASP.NET Core 11: register the service, add the StackExchange Redis distributed cache, and let GetOrCreateAsync give you a two-tier cache with built-in stampede protection and tag invalidation.

ASP.NET Core 11 has built-in validation for minimal APIs: call AddValidation, annotate your request record with DataAnnotations, and a source generator validates the bound model and returns 400 ProblemDetails before your handler runs. No controllers, no FluentValidation, no manual checks.

.NET 11 Preview 4 ships a built-in meter for Microsoft.Extensions.Caching.Memory, so cache hit ratio and evictions flow into OpenTelemetry without a background poller.