Shipped. Daily, Tuesday, June 10, 2026

The Lead

Fable 5 is not a Preview. Not behind a waitlist. Anthropic put the first Mythos-class model into general release on June 9: model ID claude-fable-5, 128,000 output tokens, $10 input and $50 output per million tokens. Pro, Max, Team, and seat-based Enterprise plans get it free through June 22. The simultaneous Claude Mythos 5 release stays limited, via Project Glasswing.

TechCrunch put the timing plainly: Anthropic shipped its most powerful public model within days of warning that AI is getting too dangerous. That is the move and the month in one sentence. (anthropic.com)

Models

1 release

Jun 09

MODEL

Claude Fable 5 and Claude Mythos 5

First Mythos-class model in general release. Model ID: claude-fable-5. Supports 128,000 output tokens. Pricing: $10 input / $50 output per MTok. Available on Claude API, Bedrock, and Vertex. Free on Pro, Max, Team, and Enterprise through June 22, 2026. Claude Mythos 5 available simultaneously in limited access via Project Glasswing.

How to use Pass model="claude-fable-5" in your API call. Re-tune prompts; the capability jump over prior flagships is significant. Pricing unchanged from Fable 5 Preview tiers.

API and Platform

1 release

Jun 09

API

Claude Managed Agents: Cron Schedules and Credential Vaults (public beta)

Managed Agents now support cron-based scheduling: attach an agent to a schedule on the Claude Platform and it fires automatically, no manual trigger needed. Credential vault integration keeps secrets out of model context entirely, binding keys at the network boundary only on requests to customer-allowlisted domains. No separate scheduler fee; billed through existing Claude Platform usage. Reported by itbrief.news.

How to use Add cron_schedule to your agent definition on the Claude Platform. Store credentials in the platform vault rather than the system prompt. See Claude Platform docs for vault allowlist configuration.

Claude Code

2 releases

Jun 09

CODE

Claude Code v2.1.170

Claude Fable 5 available in Claude Code. Fixed sessions not saving transcripts when launched from the VS Code integrated terminal or shells with inherited Claude Code environment variables.

How to use Run claude update to pull v2.1.170 and access Fable 5 in your sessions.

Jun 10

CODE

Claude Code v2.1.172

Sub-agents can now spawn their own sub-agents, up to 5 levels deep. Bedrock reads AWS region from ~/.aws config when AWS_REGION is not set. Plugin marketplace gains a search bar. Added model attribute to the claude_code.lines_of_code.count OTEL metric. Multiple fixes for background sub-agents, model picker, permission rules, WebFetch wildcard domains, and idle CPU usage. Performance improvements for long conversations.

How to use Run claude update. Sub-agent nesting is on by default. Bedrock users can remove the AWS_REGION env var if ~/.aws is configured.

Quiet on the Wire

Watch.

claude-sonnet-4-20250514 and claude-opus-4-20250514 retire June 15. Five days from today. Production code pinning either model ID returns errors on Sunday. Migrate to claude-sonnet-4-6 and claude-opus-4-7 before then.

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