Evidence record / deepseek-harness
A dated record of one change, kept so the writing that cites it can be checked. Compiled from the sources listed below by the research run, not written for reading. The judgment lives in the issues that cite it, below.
2026-09-21-deepseek-harness-default-model-moved-to-deepseek-v4-1-flash-default-wire-protocol-moved-to-messages-on-alph
Default model moved to DeepSeek-V4.1-Flash; default wire protocol moved to Messages on alpha. For the Writing lane’s model-launch item: the harness’s default model did change, in 0.1.5-rc.1 (2026-09-10), from deepseek-v4-flash to the deepseek-flash alias for DeepSeek-V4.1-Flash. Provider stayed deepseek-official. On alpha, the adapter now speaks the Anthropic-style Messages protocol to DeepSeek by default.
Channel: preview-or-beta. Half: capability. Date: 2026-09-10 (rc.1 model), 2026-09-15 (alpha protocol), 2026-09-17 (alpha catalog).
Operator consequence: New sessions change model on upgrade unless your profile pins one. Pin model in your patch if you compare runs across versions. On alpha, remove any hard-coded official root baseURL override or requests fail.
Receipt
Finding metadata
Run: 2026-09-21-weekly-digest-2026-08-20_2026-09-21-frontier-v0
Finding ID: 2026-09-21-deepseek-harness-default-model-moved-to-deepseek-v4-1-flash-default-wire-protocol-moved-to-messages-on-alph
Profile citations
- deepseek-harness / claim / default-model-v4-1-flash
Source links
Primary links, including exact changelog lines when available.
Versioned source: run artifact