Anthropic's SDK update hints at a new 'claude-opus-5-5' model and advanced context handlin

EXHIBIT 1538 · FLASH

Sep 22, 2026 17:19 UTC github_releases+hn+model_catalog+npm+pages+pypi+sitemap @anthropic-ai/sdk

Anthropic's SDK update hints at a new 'claude-opus-5-5' model and advanced context handling, alongside `claude-code` and `claude-haiku-4-5`.

READY TO POST:

anthropic's latest sdk has a new model id: claude-opus-5-5. could this be their next flagship? also seeing references to claude-code and haiku-4-5.

interesting new context window and continuation summary prompts in the anthropic sdk. looks like they're working on some pretty sophisticated session management.

[MERGED across 10 sources: github_releases, hn, model_catalog, npm, pages, pypi, sitemap] shared signal: claude-code, claude-haiku-4-5, claude-opus-4-8, claude-opus-5-5 --- model_catalog :: litellm model catalog --- Model catalog: 1 new model id appeared across cloud providers [watched families / cloud] (1) + claude-opus-5-5 --- npm :: @anthropic-ai/sdk --- @anthropic-ai/sdk 0.127.0 -> 0.128.0: +683 strings, -1797 strings, 36 flagged as interesting [model_id] (1) + claude-opus-5-5 [feature_flag] (2) + internal_error + ts * declare module '@anthropic-ai/sdk/internal/request-options' { * interface RequestOptions { * myContext?: string; * } * } * [sentence] (34) + ts * declare module '@anthropic-ai/sdk/internal/request-options' { * interface RequestOptions { * myContext?: string; * } * } * + You have been working on the task described above but have not yet completed it. Write a continuation summary that will allow you (or another instance of yourself) to resume work efficiently in a future context window where the conversation history will be replaced with this summary. Your summary sh + You have been working on the task described above but have not yet completed it. Write a continuation summary that will allow you (or another instance of yourself) to resume work efficiently in a future context window where the conversation history will be replaced with this summary. Your summary sh + from walking out of the root via a literal or * brace-expanded + json * [ * { * "name": "get_stock_price", * "description": "Get the current stock price for a given ticker symbol.", * "input_schema": { * "type": "object", * "properties": { + json * [ * { * "role": "user", * "content": "What's the Greek name for Sun? (A) Sol (B) Helios (C) Sun"