Near-Fable-5 frontier intelligence at half the price ($5/$25 per Mtok) and state of the art on coding evals, live today across the API, Claude.ai, and Claude Code. If you build on frontier models, benchmark Opus 5 on your own tasks now that the price-per-capability has shifted.
read the source →Opus 5 becomes the default with fast mode, plus a sandbox network allowlist and a DirectoryAdded hook to register repos mid-session. Update Claude Code to pick up the new default and the mid-session repo hook.
Opus 5 is now selectable in Copilot Pro+, Max, Business, and Enterprise for long-running, multi-step coding tasks across VS Code, JetBrains, and mobile. Switch it on for your heaviest agentic sessions.
A new Flash model with configurable reasoning effort and parallel tool use, with higher task-completion and better token efficiency than 3.5 Flash; also shipping in Copilot. Worth A/B-ing on cost-sensitive agent workloads.
Router reads each request and sends it to the best model, with Intent modes, so you stop hand-picking models per task. Turn it on if you have been manually swapping models between refactors and quick edits.
Copilot's MCP trust layer, Codex's wider rm detection, Claude Code's runaway caps, and the Grok Build repo-exfiltration scare all landed in the same two weeks. Safety is now a shipping feature, not an afterthought.
No hype. No 12-part funnels. Just the tools I've actually run.