Anthropic released Fable 5.1 and Mythos 5.1 on September 1 — the same underlying model behind two different safeguard settings, with Fable generally available and Mythos limited to trusted-access programs.
What it means for your work
The change that shows up on a bill is the cache-read price, which is where long agentic runs spend; Devin's team said it is what finally made a Fable-class model economical for their code review.
Our read on the items that move something. The reporting is everyone's; this part is ours.
1
If your merge rule counts approvals, this is the first setting under which a machine can satisfy it — worth deciding on purpose rather than finding out during a release.GitHub Copilot can now approve a pull request, if an admin switches it onThe AI-Assisted Software Development beat · GitHub
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The last mile of a pull request — rerunning checks, clearing conflicts, answering review notes — is the part that actually eats an afternoon.VS Code 1.136 adds an agent that works a pull request until it is ready to mergeThe AI-Assisted Software Development beat · Visual Studio Code
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Third Flash release in six weeks at the same rate card — the cheap tier is where most production traffic actually runs, and working harder per task is a cost change even when the price is not.Google's Gemini 3.8 Flash holds the old price and adds a cybersecurity-only siblingThe AI-Assisted Software Development beat · Google DeepMind
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All coverage
Everything Intel has read, newest first. Each title opens at its original publisher.
When agents arrive through declared tools rather than the page, what your site exposes - and what it refuses - becomes a product decision rather than a search one.
If your requirement is loose, a fresh install now pulls the 2.x library and the reference servers will not start on it. Pin explicitly before the next deploy.
Six days from spec publication to GA across every Copilot surface, with the two largest rival vendors co-maintaining, is the point at which packaging skills and MCP servers separately per client stops being worth the effort.
If you have wanted your own data in front of a chat assistant without building an app, this is the current shortest real path, written down by someone who did it.
The connection layer between models and business data is thin enough to rebuild, which makes a deep enterprise trial a real commercial risk for anyone selling one.
Anything hosting or consuming a remote tool server can version per request and drop sticky sessions — but a handshake-era client needs the compatibility path, not a version bump.
The first government-issued checklist specifically for MCP deployments — worth a direct read before your next MCP server goes into production, not just a headline.
National Security Agency (AI Security Center)·2026-05-20
Confirms MCP as the durable interop bet for Intel's agent-facing side — "serve our KB over MCP" reaches every major client without per-client integration.