# opencode v1.18.27

- Product: opencode (https://whatsnew.fyi/product/opencode)
- Vendor: anomalyco
- Date: 2026-09-02
- Version: v1.18.27
- Original notes: https://github.com/anomalyco/opencode/releases/tag/v1.18.27
- Permalink: https://whatsnew.fyi/product/opencode/releases/v1.18.27

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

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

##### 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)