Observed source change · Anthropic
Claude exact model identities and documented context/output documentation changed
Published documentation; runtime behavior and legal interpretation not established.
Last unchanged check: 2026-10-21T18:50:09Z
First changed check: 2026-10-21T20:55:09Z
Before
Once you've picked a model, [learn how to make your first API call](https://platform.claude.com/docs/en/get-started). To understand how model IDs, aliases, and snapshots work, see [Model IDs and versioning](https://platform.claude.com/docs/en/about-claude/models/model-ids-and-versions); for the reliable-knowledge and training-data cutoffs behind each model, see [Anthropic's Transparency Hub](https://www.anthropic.com/transparency). * **Output quality:** When migrating from a previous model generation, you may notice larger improvements in overall performance. If you're on Claude Opus 5 or earlier, see the [Claude Opus 5.5 migration guide](https://platform.claude.com/docs/en/models/opus-5-5/migration-guide). If you're ready to start exploring what Claude can do for you, dive in! Whether you're a …
After
Once you've picked a model, [learn how to make your first API call](https://platform.claude.com/docs/en/get-started). To understand how model IDs, aliases, and snapshots work, see [Model IDs and versioning](https://platform.claude.com/docs/en/about-claude/models/model-ids-and-versions); for the reliable-knowledge and training-data cutoffs behind each model, see Anthropic's [Transparency Hub](https://www.anthropic.com/transparency). * **Output quality:** When migrating from a previous model generation, you might notice larger improvements in overall performance. If you're on Claude Opus 5 or earlier, see the [Claude Opus 5.5 migration guide](https://platform.claude.com/docs/en/models/opus-5-5/migration-guide). Whether you're a developer looking to integrate Claude into your applications or a user wanting to experience …
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Raw before SHA-256: e45c1c8a21ca036c6638de55904540e3040c60d7547e322c3440c45faf1cb4fc
Raw after SHA-256: 86d26d2b1f39ff97f686ebf6633042048886b26ece5a1214a4b8a3352a35f692
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