Wednesday, April 8, 2026
Daily picks
21
articles scored
#1 GOLDReleaseGitHub anthropics/anthropic-sdk-python
claude-mythos-preview appears simultaneously in all Anthropic SDKs
- All five major Anthropic SDKs (Python, TypeScript, Go, Java, C#) shipped a new release on the same day, and they all have exactly one thing in common: `claude-mythos-preview` is now a supported model ID
- You can start passing `model="claude-mythos-preview"` in your API calls right now — the SDK handles it, though actual access depends on Anthropic granting your account
- This is the standard pattern Anthropic uses just before a model becomes broadly available: SDK support lands first, public announcement follows
- The synchronized multi-language rollout suggests this isn't a leak — it's a coordinated release prep
- Related context: a Thomas Friedman NYT piece and Anthropic's "Glasswing" page are already circulating with details about Mythos' capabilities, including finding vulnerabilities in major software systems
#2 SILVERReleaseClaude Code Releases
Claude Code v2.1.94 — effort defaults back to high for API users, 20+ fixes
- Default effort level is now `high` again for API-key, Bedrock/Vertex/Foundry, Team, and Enterprise users — it was silently changed to `medium` a while back, this reverses that; control it with `/effort`
- Bedrock Mantle is now supported via `CLAUDE_CODE_USE_MANTLE=1`
- Fixed: agents stuck silently after 429 rate-limit (error now surfaces immediately)
- Fixed: Console login on macOS silently failing with "Not logged in" when keychain is locked — `claude doctor` now diagnoses it
- Fixed: CJK and multibyte text corruption when chunk boundaries split a UTF-8 sequence in stream-json mode
- `--resume` now works across worktrees of the same repo directly, no more `cd` command required
#3 BRONZEReleaseGitHub anthropics/anthropic-sdk-python
Amazon Bedrock Mantle client lands across all Anthropic SDKs
- A new `AnthropicBedrockMantle` client is now available in Python (v0.91.0), TypeScript (v0.85.0), Go (v1.32.0), and C# Bedrock (v0.2.0) — also in Claude Code itself via `CLAUDE_CODE_USE_MANTLE=1`
- Mantle is Amazon's unified inference layer for Bedrock — this client lets you talk to Claude through Mantle's routing without managing region-specific endpoint strings manually