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Sweep 06 Nov 2026 · 01:32Z Build v2.1.319 537 read Stable v2.1.311 Latest v2.1.319 Next v2.1.319 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Developer Platform 22 Sep 2026
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apple-foundation-models changedcli-sdks-libraries/libraries/apple-foundation-models

Nearest release: v2.1.280, published under an hour before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

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First seen 14 Aug 2026 this site's first read of the page
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6868Model identifiers are values of `ClaudeModel`. Use a compiled-in constant, or construct one with explicit capabilities for an ID that isn't compiled in yet (see [Capabilities](https://platform.claude.com/docs/en/cli-sdks-libraries/libraries/apple-foundation-models#capabilities)):
6969 
7070```swift
71ClaudeLanguageModel(name: .opus5, auth: auth)
71ClaudeLanguageModel(name: .opus5_5, auth: auth)
7272```
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7474Constants mirror API model IDs (`.opus5` is `claude-opus-5`) and carry each model's capabilities. New models ship as new constants in package releases; check `ClaudeModel` in Xcode for the current list, and the [Models overview](https://platform.claude.com/docs/en/models/overview) to compare models.
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9090Pin a Claude [effort level](https://platform.claude.com/docs/en/build-with-claude/effort) for every request with `fixedEffort:`. It takes precedence over the framework's per-request reasoning hints. The framework's named reasoning levels stop at high; to request more effort for a single request instead, pass a custom reasoning level naming the Claude effort (`.custom("xhigh")` or `.custom("max")`), which maps directly. The API defaults to `high` when no effort is sent:
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9292```swift
93ClaudeLanguageModel(name: .opus5, auth: auth, fixedEffort: .xhigh)
93ClaudeLanguageModel(name: .opus5_5, auth: auth, fixedEffort: .xhigh)
9494```
9595 
9696The level must be one the model accepts. Each `ClaudeModel` declares which of the five levels (`low`, `medium`, `high`, `xhigh`, `max`) its model takes, if any: some models don't accept effort at all.
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