The OpenAI Agents SDK has been updated to version 0.20.0, which implicitly changes the default model to GPT 5.6 Luna. This update affects applications that relied on the previous implicit default model, altering their runtime behavior without requiring code changes. The release also includes migration support for MCP v2 and enhancements to RunState.add_input() for persisting input before model calls, along with tighter binding of tool approvals to invocation identity. AI
IMPACT Developers using the OpenAI Agents SDK will need to be aware of the default model change to GPT 5.6 Luna, which may affect application behavior without explicit code updates.
RANK_REASON This is a software development kit update, not a core AI model release.
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