Anthropic's API changelog shows updates to Claude Opus 5 with new steering controls, mid-c

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Jul 25, 2026 15:46 UTC docs https://platform.claude.com/docs/en/release-notes/api

Anthropic's API changelog shows updates to Claude Opus 5 with new steering controls, mid-conversation tool changes, and the removal of fast mode for Claude Opus 4.7, plus new higher education categories.

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anthropic's api changelog updated! opus 5 now has 'effort' as a primary steering control and expanded mid-conversation tool changes. seems like more nuanced control is coming.

looks like anthropic is deprecating fast mode for claude opus 4.7, pushing users to opus 5 or 4.8. also, new education categories for claude. interesting changes.

Anthropic API changelog changed: https://platform.claude.com/docs/en/release-notes/api 18 added lines --- +++ @@ -68,5 +68,6 @@ Customer support -Education Financial services Government +Higher education +K-12 teachers Life sciences @@ -167,5 +168,4 @@ . -Claude Opus 5 supports the full -effort -ladder ( +Effort +is the primary control for steering Claude Opus 5: the model supports the full ladder ( low @@ -179,6 +179,6 @@ max -), including the +), with max -level for capability-critical work. -Mid-conversation tool changes are now in beta on Claude Opus 5: add or remove tools between turns of a conversation while preserving the prompt cache. Include the +for capability-critical work. +Mid-conversation tool changes are now in beta on Claude Fable 5, Claude Mythos 5, Claude Opus 4.8, and Claude Opus 5: add or remove tools between turns of a conversation while preserving the prompt cache. Include the mid-conversation-tool-changes-2026-07-01 @@ -195,2 +195,13 @@ Refusals and fallback +. +We've removed +fast mode +for Claude Opus 4.7. Requests to +claude-opus-4-7 +with +speed: "fast" +now return an error; unlike Claude Opus 4.6, they do not fall back to standard speed. Claude Opus 4.7 itself remains available at standard speed. To continue using fast mode, migrate to +Claude Opus 5 +or Claude Opus 4.8. Read more in +Fast mode .