GLM-5.2 is the first open-weight model that feels right as a general coding agent in real harness use, despite minor integration bugs like image inputs bricking a Fireworks API session.

Testing GLM-5.2 hands-on via Fireworks' API inside Claude Code to build course content, the author found setup easy and capabilities immediately convincing, aside from a bug where sending images would brick the API session. ✦ AI generated

Nathan Lambert · Interconnects · 2026-06-22 · original ↗

I put it to work helping make content for my post-training course with Fireworks' API in Claude Code (setting this up was very easy). There were some minor knife cuts, such as the Claude Code harness / my repo documentation trying to send images to the model, which would brick Fireworks API for the session — forcing a manual context clear.

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