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Fast mode is out of research preview for Claude Opus 5.5, and you no longer need to request access

Thu, October 15, 2026

25 days agoUnverified

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Fast mode is out of research preview for Claude Opus 5.5, and you no longer need to request access. Requests to Claude Opus 5.5 no longer require the fast-mode-Feb 1, 2026 beta header, and requests that still send it keep working. Claude Opu.

Every year

Jun 30Claude Sonnet 5 launches with a 1M token context window at $2 / $10 per MTokanthropicAn event.4 mo agoanthropicDetails →Jul 2agent-memory-2026-07-22 beta header changes memory store listing behavioranthropicAn event.4 mo agoanthropicDetails →Jul 10Dreams research preview adds Claude Fable 5 and Claude Sonnet 5anthropicAn event.4 mo agoanthropicDetails →Jul 14Admin API adds Claude Enterprise user management in betaanthropicAn event.4 mo agoanthropicDetails →Jul 15Mid-conversation system messages available on Claude Fable 5, Mythos 5 and Opus 4.8anthropicAn event.4 mo agoanthropicDetails →Jul 22Claude Managed Agents agents accept an effort level in model configurationanthropicAn event.4 mo agoanthropicDetails →Jul 24Claude Opus 5 launches with a 1M token context window at $5 / $25 per MTokanthropicAn event.4 mo agoanthropicDetails →Jul 24Claude API fallbacks parameter adds a default mode for recommended fallbacksanthropicAn event.4 mo agoanthropicDetails →Jul 24Mid-conversation tool changes enter beta on the Claude APIanthropicAn event.4 mo agoanthropicDetails →Aug 1Dreams research preview adds support for Claude Opus 5anthropicAn event.3 mo agoanthropicDetails →Aug 3Compliance API returns cloud Cowork session transcripts in betaanthropicAn event.3 mo agoanthropicDetails →Aug 5Inference hooksanthropicAn event.3 mo agoanthropicDetails →Aug 7Claude Managed Agents sessions can consult an advisor modelanthropicAn event.3 mo agoanthropicDetails →Aug 19Agent Skills and the Skills API are out of beta on the Claude APIanthropicAn event.3 mo agoanthropicDetails →Aug 19Claude Enterprise Admin API user-management endpoints are out of betaanthropicAn event.3 mo agoanthropicDetails →Aug 19Files API is out of beta on the Claude APIanthropicAn event.3 mo agoanthropicDetails →Aug 19Claude computer use tool is out of beta as computer_toolset_20260801anthropicAn event.3 mo agoanthropicDetails →Aug 19Claude API launches browser_toolset_20260801 browser use toolanthropicAn event.3 mo agoanthropicDetails →Aug 26Admin API comes to the ant CLI and Claude SDKs under client.beta.organizationanthropicAn event.2 mo agoanthropicDetails →Aug 26Compliance API adds Claude Science and Microsoft 365 session transcripts in betaanthropicAn event.2 mo agoanthropicDetails →Sep 1Claude Fable 5.1 launches alongside Claude Mythos 5.1 with 1M token contextanthropicAn event.2 mo agoanthropicDetails →Sep 1Claude API adds turn-scoped system messages in betaanthropicAn event.2 mo agoanthropicDetails →Sep 1Claude API thinking.display adds an updates mode in betaanthropicAn event.2 mo agoanthropicDetails →Sep 1Per-message effort changes enter beta on the Claude APIanthropicAn event.2 mo agoanthropicDetails →Sep 1Claude Fable 5.1 thinking blocks only replay to the same or newer modelsanthropicAn event.2 mo agoanthropicDetails →UnverifiedSep 1Claude Fable 5.1 and Claude Mythos 5.1 launchanthropicAn event.2 mo agoanthropicDetails →Sep 3Per-message effort changes beta expands to Claude on Google CloudanthropicAn event.2 mo agoanthropicDetails →Sep 10ant CLI 1.32.0 adds sessions connect for live Managed Agents sessionsanthropicAn event.2 mo agoanthropicDetails →UnverifiedSep 10Smart reports (beta)anthropicAn event.2 mo agoanthropicDetails →Sep 14Claude API input_transformations adds thinking_mismatch_allowed entries in betaanthropicAn event.2 mo agoanthropicDetails →Sep 14Messages API adds on-demand conversation compaction in betaanthropicAn event.2 mo agoanthropicDetails →Sep 18Compliance API adds Claude in Chrome session transcripts in betaanthropicAn event.2 mo agoanthropicDetails →UnverifiedSep 18For cache diagnostics, a response to a request that sends the cache-diagnosis-2026-04-07 beta header nowanthropicAn event.2 mo agoanthropicDetails →Sep 22Claude Opus 5.5 launches with a 1M token context window and 128k outputanthropicAn event.2 mo agoanthropicDetails →Sep 22Claude API beta lets tools be defined inside mid-conversation system messagesanthropicAn event.2 mo agoanthropicDetails →Sep 22Fast mode research preview available for Claude Opus 5.5 on the Claude APIanthropicAn event.2 mo agoanthropicDetails →UnverifiedSep 22Claude Opus 5.5 launchanthropicAn event.2 mo agoanthropicDetails →UnverifiedSep 23Cache diagnostics is out of beta on the Claude API and no longer requires the cache-diagnosis-2026-04-07 betaanthropicAn event.2 mo agoanthropicDetails →UnverifiedSep 24The Compliance API local session endpoints are out of beta for Claude for Microsoft 365 sessions in ExcelanthropicAn event.2 mo agoanthropicDetails →UnverifiedSep 28We've launched Claude Sonnet 5.5 (claude-sonnet-5-5)anthropicAn event.42 days agoanthropicDetails →UnverifiedSep 30In Python SDK 1.10.0, TypeScript SDK 0.130.0, C# SDK 12.52.0, Go SDK 1.77.0, Java SDK 2.67.0, PHP SDK 0.53.0anthropicAn event.40 days agoanthropicDetails →UnverifiedOct 1We've added a line field to the Models APIanthropicAn event.39 days agoanthropicDetails →UnverifiedOct 1Dreams (research preview) now supports Claude Opus 5.5, Claude Fable 5.1, and Claude Sonnet 5.5anthropicAn event.39 days agoanthropicDetails →UnverifiedOct 5We've added capabilities.thinking.types.disabled to the Models APIanthropicAn event.35 days agoanthropicDetails →UnverifiedOct 6We've added capabilities.server_tools to the Models APIanthropicAn event.34 days agoanthropicDetails →UnverifiedOct 7The Python and TypeScript SDKs now include classes, in beta, for the browser use tool and the computer useanthropicAn event.33 days agoanthropicDetails →UnverifiedOct 7We've launched Claude Haiku 5.5 (claude-haiku-5-5), our most capable model tuned for high-volume andanthropicAn event.33 days agoanthropicDetails →UnverifiedOct 8The Compliance API can now download Claude Docs documents as Word files, in betaanthropicAn event.32 days agoanthropicDetails →UnverifiedOct 8The Compliance API chat endpoints now also return chats from the unified Claude experience, in beta foranthropicAn event.32 days agoanthropicDetails →UnverifiedOct 9You can now let a Claude Managed Agents agent use dynamic workflows, in beta with theanthropicAn event.31 days agoanthropicDetails →UnverifiedOct 14Claude Managed Agents scheduled deployments are now available on Claude Platform on AWSanthropicAn event.26 days agoanthropicDetails →UnverifiedOct 14We've launched OpenTelemetry export in beta, so you can trace Messages API requests and Claude Managed AgentsanthropicAn event.26 days agoanthropicDetails →UnverifiedOct 15We've added capabilities.thinking.types.between_tools to the Models APIanthropicAn event.25 days agoanthropicDetails →UnverifiedOct 15Fast mode for Claude Opus 5.5 is now available on Claude in Microsoft Foundry for deployments hosted on AzureanthropicAn event.25 days agoanthropicDetails →
UnverifiedOct 15Fast mode is out of research preview for Claude Opus 5.5, and you no longer need to request accessanthropicAn event.25 days agoanthropic
UnverifiedOct 15The Compliance API now returns the text each organization member saved as Instructions for Claude inanthropicAn event.25 days agoanthropicDetails →UnverifiedOct 20The Claude Tag API is available in beta for Claude Enterprise organizations with theanthropicAn event.20 days agoanthropicDetails →UnverifiedOct 20We've added organization webhooks to the Admin API, in beta with the webhooks-2026-10-07 beta headeranthropicAn event.20 days agoanthropicDetails →UnverifiedOct 20We've launched user profiles, so you can tell Anthropic which of your end customers each API request is foranthropicAn event.20 days agoanthropicDetails →UnverifiedOct 20Inference hooks are out of beta for Claude Enterprise organizationsanthropicAn event.20 days agoanthropicDetails →

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  • 2026-10-20: added to 2026-10-15