v2.13.0

New Features

• [core] Add toReadableStream() method to SseStream.
  The new method converts the asynchronous iterable stream to a pull-based ReadableStream of newline-delimited JSON, enabling composable transformations via the Web Streams API pipeThrough() pattern with native flow control. (6542a2a)
• [langchain] Add cache_control call option to the LangChain orchestration client.
  When the cache_control option is set, a cache breakpoint is automatically applied to the request. (fafd99e)
• [langchain] Expose cached_tokens and cache_creation_tokens in usage_metadata.input_token_details for LangChain orchestration responses. (fafd99e)
• [openai] Allow setting a model configuration per request. (fea1c3f)

Improvements

• [core] Remove deprecated models mistralai--mistral-small-instruct (retirement date: not earlier than 2026-09-30) — use mistralai--mistral-small instead, amazon--nova-premier (retirement date: 2026-09-10) — use amazon--nova-lite (version: 2) instead, anthropic--claude-3-haiku (retirement date: 2026-09-10) — use anthropic--claude-4.5-haiku instead and anthropic--claude-4-sonnet (retirement date: 2026-10-14) — use anthropic--claude-4.5-sonnet instead. (11baf52)
• [core] Added gpt-5.1 to the available model list. (cb8ffe7)
• [core] Remove deprecated models gpt-4.1 (retirement date: 2026-10-14), gpt-4.1-mini (retirement date: 2026-10-14), o3 (retirement date: 2026-10-16) and o4-mini (retirement date: 2026-10-16). (a8c9b29)