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OpenAI Agents SDK 0.20.0 updates default model to GPT 5.6 Luna

By PulseAugur Editorial · [1 sources] ·

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.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

OpenAI Agents SDK 0.20.0 updates default model to GPT 5.6 Luna

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0 / 100
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Tool
This is a software development kit update, not a core AI model release.
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Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
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product, infra
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High
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52 days old
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COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · LucioLiu ·

    An SDK Upgrade Can Change an Agent Without Changing the App

    <p>An SDK upgrade can change an agent even when the application code does not.</p> <p>OpenAI Agents SDK 0.20.0 changes the implicit default model to <code>gpt-5.6-luna</code>. Explicit models, run-level overrides, and <code>OPENAI_DEFAULT_MODEL</code> still take precedence, but a…

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