A bounded look at the WWDC26 LanguageModel abstraction, image input, Private Cloud Compute, tools, and evaluation in the iOS 27 beta cycle.
Separate Llama 4 output, local inference, tool parsing, and authorization to build a testable local agent that remains safe on bad calls.
Understand Gemini 3.5 Flash and hosted agent runtimes through execution boundaries, durable state, approvals, observability, and portability.
Use a fixed GPT-5.5 snapshot in a controlled Responses API tool loop with reasoning policy, validation, idempotent execution, and recoverable checkpoints.
Evaluate GPT-5.5 on frozen tasks, hidden acceptance, tool traces, blinded review, and total task cost after its April 2026 API availability.