Open weights ate the week. Two big Chinese coding models, a corrected benchmark, and a couple of developer-tooling shifts worth a look.
- Z.ai releases GLM-5.2 open weights — Z.ai published the full MIT-licensed weights of GLM-5.2 on June 16 (753B params, 40B active, 1M-token context), claiming it beats GPT-5.5 on several long-horizon coding benchmarks at roughly one-sixth the cost.
- Moonshot AI releases Kimi K2.7-Code — Moonshot shipped an open-weight (modified MIT) coding model, a 1T-parameter MoE with 32B active and a 256K context, reporting +21.8% on its own Code Bench v2 over K2.6 while using about 30% fewer reasoning tokens.
- Epoch AI ships FrontierMath v2 — After an audit found small but critical errors in 42% of the original problems, Epoch corrected 135 and removed 12, leaving a 338-problem set on which Claude Fable 5 now holds the top spot.
- OpenAI adds Record & Replay to Codex — On June 18 OpenAI added a macOS feature that turns a demonstrated workflow into a reusable Codex skill.
- Gemini 3.5 Flash hits general availability — Google moved Gemini 3.5 Flash to GA in the Gemini API on June 16, positioning it as its default model for sustained agentic and coding work.
- Anthropic ships a Claude Design overhaul — A June 17 update adds design-system imports from GitHub repos or raw uploads, tighter Claude Code integration, direct canvas editing, and more export options.