Anthropic

22 models · 4 agents · 2 APIs · 2 apps · 1 developer tool

Every change, in the Monday brief

Updates

All 118 changes

Claude Opus 4.8

Model at Anthropic

Retiring2d

Claude Opus 4.8 fast mode is deprecated and ends November 30, 2026

Fast mode for Claude Opus 4.8 is deprecated and will be removed on November 30, 2026. After removal, requests with speed set to fast will return an error.

Takes effect Nov 30, 2026 · in 29 days

Action needed:: Migrate fast mode requests to Claude Opus 5.5 before November 30, 2026.

API at Anthropic

New release3d

Claude API launches Usage and Cost Analytics API in beta

New analytics endpoints report token usage and cost for Console and Enterprise organizations, grouped by model, workspace, API key or user. The older Usage and Cost API is now legacy but remains supported.

Perplexity Agent API and Claude Opus 5.5

2 products from Perplexity AI and Anthropic

Limits change3d

Perplexity Agent API xhigh effort raises max steps from 100 to 300

The xhigh level stays on Claude Opus 5.5 with GPT-6.1 Sol as fallback. Context compaction starts at 150,000 tokens, and it no longer sends a system prompt.

Before

100 max steps

After

300 max steps

Upcoming

Announced dates

Nov 16: Copilot to remove Claude Opus 4.8, Claude Opus 5 and GPT-5.6 Terra on November 16Retiring · in 15 days
Nov 30: Claude Opus 4.8 fast mode is deprecated and ends November 30, 2026Retiring · in 29 days
Nov 30: Claude Sonnet 4.5 deprecated, retiring November 30, 2026Retiring · in 29 days
Dec 14: Standalone Claude Design closes December 14Retiring · in 43 days

Families

Claude Opus
Model family · 8 models
Retiring: Claude Opus 4.8 fast mode is deprecated and ends November 30, 2026 · 2d
Claude Fable
Model family · 2 models
Now available: Full Claude Platform available on Google Cloud (Anthropic managed) · 1w
Claude Sonnet
Model family · 5 models
Now available: Full Claude Platform available on Google Cloud (Anthropic managed) · 1w
Claude Mythos
Model family · 3 models
Successor: Claude Fable 5.1 released as the successor to Fable 5 · Sep 1, 2026
Claude Haiku
Model family · 4 models
Now available: Full Claude Platform available on Google Cloud (Anthropic managed) · 1w

Models

Claude Opus 5.5
Model · Claude Opus family
Limits change: Perplexity Agent API xhigh effort raises max steps from 100 to 300 · 3d
Claude Fable 5.1
Model · Claude Fable family
Now available: Full Claude Platform available on Google Cloud (Anthropic managed) · 1w
Claude Mythos 5.1
Model · Claude Mythos family
Successor: Claude Fable 5.1 released as the successor to Fable 5 · Sep 1, 2026
Claude Sonnet 5.5
Model · Claude Sonnet family
Now available: Full Claude Platform available on Google Cloud (Anthropic managed) · 1w
Claude Fable 5
Model · Claude Fable family
Successor: Claude Fable 5.1 released as the successor to Fable 5 · Sep 1, 2026
Claude Opus 5
Model · Claude Opus family
Benchmark: Arena text leaderboard: Gemini 4 Argon first, Opus 5.5 second, GPT-6 Astra 73rd · 1w
Claude Haiku 5.5
Model · Claude Haiku family
Now available: Full Claude Platform available on Google Cloud (Anthropic managed) · 1w
Claude Sonnet 5
Model · Claude Sonnet family
Price change: Claude Sonnet 5 keeps its $2 / $10 price permanently · Aug 10, 2026

Agents

Claude Code
Agent
Default change: Claude Code makes Haiku 5.5 the default Haiku model · 3w
Claude Cowork
Agent
Now available: Claude Cowork features available from any conversation · Sep 16, 2026
Claude Security
Agent
New release: Claude Security now scans continuously and tracks fixes · 1w
Claude Duet
Agent
New release: Claude Duet opens as a research preview for US Pro and Max subscribers · 1w

APIs

Apps

Claude
App
Price change: Anthropic offers government partners a 40% discount on Claude Enterprise and API · 5d
Claude DesignRetiring Dec 14, 2026
App
Retiring: Standalone Claude Design closes December 14 · 3w

Developer tools

Claude Agent SDK
Developer tool
Default change: Claude Agent SDK starts in default permission mode on third-party providers · 2w