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Claude API ships version 2026-10-21, its first since 2023: sampling parameters removed, new major SDKs across languages

On Oct 21 Anthropic released Claude API version 2026-10-21, its first official version since 2023. It removes the temperature, top_p and top_k sampling parameters and drops old Admin API field names, while new SDK majors (Python 2.0, TypeScript 1.0, Go 2.0, Java 3.0 and more) default to it. Version 2023-06-01 is not deprecated.

Key Takeaways

Version: 2026-10-21 is the Claude API's first official version since 2023; 2023-06-01 is not deprecated and more frequent versions are planned
Breaking: sending temperature, top_p or top_k returns a 400 on every model; Claude 4.7+ models behave as before
SDKs: Python 2.0.0, TypeScript 1.0.0, Go 2.0.0 (/v2 path), Java 3.0.0, C# 13.0.0, Ruby 2.0.0, PHP 1.0.0, ant CLI 2.0.0
Auth: SDKs send the API key as Authorization: Bearer and hold 1 credential per client; SDK license moves to Apache 2.0
Platforms: Claude API, Claude Platform on AWS, Microsoft Foundry, Google Cloud; Bedrock only for Claude 4.7+, see the migration guide

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Linked Models & Agents:

⚡ Claude Opus 5.5 ⚡ Claude Sonnet 4.6 🤖 Claude API 🤖 ant CLI 🌐 Anthropic

#Claude API#API versioning#SDK#breaking changes

Anthropic@anthropics·Collected 35d ago

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Anthropic TS SDK 0.131 / Python 1.11: Admin list spend limits; client deprecates Sonnet 4.5

Hours after 0.130/1.10 Admin GA work, Anthropic shipped @anthropic-ai/[email protected] and Python 1.11.0 at 2026-09-30T22:58Z: Admin API gains a list spend limits endpoint; both clients deprecate Sonnet 4.5 toward newer aliases (Sonnet 5.5 line).

Key Takeaways

TS sdk-v0.131.0 at 2026-09-30T22:58:20Z; Python v1.11.0 at 22:58:09Z
Admin API: list spend limits endpoint (compare)
Clients deprecate Sonnet 4.5; prefer Sonnet 5.5 aliases for new work
Install: npm i @anthropic-ai/[email protected] / pip install anthropic==1.11.0; Admin docs linked above
No public SWE-bench; enterprise quota listing + model alias hygiene

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Linked Models & Agents:

⚡ Claude Sonnet 5.5⚡ Claude Sonnet 4.5🤖 Claude Code (Anthropic)🤖 managed-agents 🌐 Anthropic

#Anthropic#SDK#Admin API#Spend limits#sonnet-4.5#Deprecation#Release

Anthropic@anthropics·Collected 36d ago

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Anthropic TS SDK 0.130 / Python 1.10: Admin analytics & plugin marketplaces; Organization API GA; MCP tunnels beta

Anthropic shipped @anthropic-ai/[email protected] and Python anthropic==1.10.0 on 2026-09-30: Admin API gains enterprise analytics, spend limits, RBAC groups/roles, Plugins/Plugin Marketplaces, and per-user usage/cost reports; Organization API endpoints go GA; MCP tunnels beta returns read-only transport plus one-time relay token on create; Managed Agents add refusal stop reason and repository error types.

Key Takeaways

Releases: TS sdk-v0.130.0 at 2026-09-30T18:29:28Z; Python v1.10.0 at 2026-09-30T18:28:45Z
Admin API: analytics, spend limits, RBAC, Plugins/Marketplaces, per-user usage/cost; compare
Organization API endpoints now GA; MCP tunnels beta adds read-only transport + one-time relay token
Managed Agents: refusal stop reason/stop_details on idle; repository error types
Install: npm i @anthropic-ai/[email protected] / pip install anthropic==1.10.0; docs https://docs.anthropic.com/en/api/admin-api

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Linked Models & Agents:

⚡ Claude Sonnet 5.5⚡ Claude Opus🤖 Claude Code (Anthropic)🤖 managed-agents 🌐 Anthropic

#Anthropic#SDK#Admin API#Organization API#MCP tunnels#Rbac#Plugins#Enterprise#Release