OpenCode v1.17.9 Released with GLM-5.2 Support and MCP Fixes
SST
OpenCode v1.17.9, released on June 21, 2026, adds high and max thinking variants for GLM-5.2 models, fixes Devstral model detection with varying provider ID casing, passes custom headers to Copilot model requests, and fixes OpenAI-compatible providers rejecting MCP tool schemas. Cloudflare AI Gateway API key passing and session timeline flicker are also fixed, and agent step limits now force a final text response rather than failing mid-run.
Why it matters
GLM-5.2 thinking-mode support ships same day as the model's ongoing adoption wave; the MCP schema fix unblocks a class of providers that were silently broken.
Importance: 2/5
In-window release; same-day GLM-5.2 thinking support and MCP compatibility fixes extend practical reach across 75+ supported providers.
Sources
official
Releases · sst/opencode