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.
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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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Everything Intel has read, newest first. Each title opens at its original publisher.
If your training plan is a prompt-engineering course, this is evidence the market is hiring for something else — and the four headings are a usable curriculum outline for a team that needs one.