# LangChain 1.3.16

- Product: LangChain (https://whatsnew.fyi/product/langchain)
- Vendor: LangChain
- Date: 2026-08-20
- Version: 1.3.16
- Original notes: https://github.com/langchain-ai/langchain/releases/tag/langchain%3D%3D1.3.16
- Permalink: https://whatsnew.fyi/product/langchain/releases/1.3.16

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.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

---

- **added** — Add standard model exception types to core
- **added** — Support custom token_counter in ContextEditingMiddleware
- **fixed** — Re-raise non-retryable exceptions in ModelRetryMiddleware
- **fixed** — Preserve final repeated schema ordering

Changes since langchain==1.3.15

release(langchain): 1.3.16 (#39806)
feat(core): add standard model exception types (#39538)
feat(langchain): support custom token_counter in ContextEditingMiddleware (#39754)
fix(langchain): re-raise non-retryable exceptions in ModelRetryMiddleware (#38960)
chore(langchain): update docs on error handling for json schema (#39632)
fix(langchain): preserve final repeated schema ordering (#39284)