AI News & Daily Digest

Anthropic · Claude APISep 1, 2026

Prompt cache reads on Claude Fable 5.1 and Claude Mythos 5.1 cost $0.25 USD per million tokens: 0.025x the…

Cache writes are unchanged. On Claude Fable 5.1 and Claude Mythos 5.1, tool_choice types any and tool aren't supported and return a 400 error. auto and none are unchanged. Thinking blocks produced by Claude Fable 5.1 and Claude Mythos 5.1 are preserved only for the model that produced them or a newer one: earlier models can't read them, and the API drops one replayed to an earlier model. Per-message effort changes are in beta on Claude Fable 5.1, Claude Mythos 5.1, and Claude Opus 5 on the Claude API. Turn-scoped system messages are in beta (mid-conversation-system-clear-at-2026-08-21 header). thinking.display accepts a third value, "updates", in beta (thinking-display-updates-2026-08-18 header). Text generated by Claude Fable 5.1 and Claude Mythos 5.1 carries Anthropic's text watermark, and supported image, video, and audio files that Claude produces through the code execution tool carry C2PA Content Credentials when you retrieve them through the Files API on the Claude API. Like Claude Fable 5, both models require 30-day data retention and aren't available under zero data retention unless expressly authorized by Anthropic. The guides for the Claude Enterprise endpoints of the Admin API (user management and spend limits), the Claude Enterprise Analytics API, and the Compliance API now show the anthropic-version header; send it on every request to these endpoints, as in the rest of the Claude API.

Every AI release note

New model: Gemini 3.8 Flash

Claude Code 2.1.258

Gemini CLI 0.58.0

Claude Code 2.1.257

Prompt cache reads on Claude Fable 5.1 and Claude Mythos 5.1 cost $0.25 USD per million tokens: 0.025x the…

Claude Fable 5.1 and Claude Mythos 5.1 launch

New models: Claude Fable 5.1 and Claude Mythos 5.1

ChatGPT for iOS

Codex CLI 0.152.0

Codex CLI 0.152.1

Agentic video understanding: Released agentic video understanding for Gemini 3.7 Flash, 3.6 Flash, and 3.5…

Model autocompletion improvements, subagent streaming optimizations, and MCP tool resolution fixes

grok-imagine-image-quality retirement on November 2

Grok 4.7

Grok Voice Transcribe 2.0

Claude Code 2.1.252

Default Gemini 3.8 Flash model upgrade, lightweight agent configuration, and Vertex AI Express mode

OCR 4.1 is now Generally Available

Claude Code 2.1.251

Claude Code 2.1.250

Claude Code 2.1.248

In Python SDK 1.2.0, TypeScript SDK 0.122.0, Go SDK 1.68.0, Java SDK 2.59.0, Ruby SDK 1.67.0, and C# SDK…

Model selection command arguments, reasoning effort autocompletion, transient retry handling, and UI…

New model: Gemini Omni Flash

Claude Code 2.1.247

The Compliance API session endpoints are out of beta for Cowork and Claude Code sessions

ChatGPT for iOS

Voice dictation, embedded ripgrep code search, status line cost metrics, and UTF-8 encoding fixes

Generative UI and UI improvements

New model: Gemini 3.5 Transcribe