OpenCode 1.18.27

Changelog: v1.18.27

Core

Bugfixes

• Default provider header timeouts to five minutes so slow model startups fail less often.
• Default streamed chunk timeouts to five minutes, with false supported to disable them.
• Let Anthropic thinking.blockBinding opt out via config when you need to keep the provider default. (@dkindlund)
• Limit Anthropic thinking block binding to Claude 5.1+ models so older deployments do not reject requests.
• Avoid unhandled errors when canceling timed-out SSE reads. (@AlexanderWillner)

Thank you to 2 community contributors:

• @AlexanderWillner:
• fix(provider): handle SSE reader cancel rejections (#44944)
• @dkindlund:
• fix(opencode): let config opt out of Anthropic thinking blockBinding (#46820)