docs: sync model facts with 2026-10-01 ECNU update

references/agent_development.md

@@ -8,11 +8,12 @@ Model facts and protocol rules are linked from [models.md](models.md) and
 [api_reference.md](api_reference.md). The design advice and prompt examples
 below are **`application-policy`**: starting points to evaluate on your tasks.
 
-**Contract update checked 2026-10-02:** the 2026-09-18 model change made
-`ecnu-max` text-only again; use `ecnu-plus` for vision. Plus now supports
-`low` / `medium` / `xhigh` effort when thinking is enabled. The older model
-choices below describe the September 12 checks, not current execution advice;
-follow [current model selection](models.md) and [thinking](examples.md#thinking-and-tool-history).
+**Contract update checked 2026-10-19:** the 2026-10-01 model update moved
+`ecnu-max` to a multimodal backend, and both primary models now document image
+understanding. Plus supports `low` / `medium` / `xhigh` effort when thinking is
+enabled. The older model choices below describe the September 12 checks, not
+current execution advice; follow [current model selection](models.md) and
+[thinking](examples.md#thinking-and-tool-history).
 
 ## Choose a model and reasoning budget
 
@@ -33,9 +34,9 @@ Two upstream differences matter when adapting examples:
   ECNU still documents `low` / `high` / `max` for direct Chat requests. Use the
   ECNU protocol mappings; do not invent numeric equivalents.
 - **Qwen3.8:** upstream thinking defaults and template options differ from
-  ECNU. On ECNU, thinking defaults off, and `ecnu-plus` ignores effort tiers.
-  Use `thinking.type`; do not copy `enable_thinking`, `preserve_thinking`, or
-  `chat_template_kwargs` into ECNU requests.
+  ECNU. On ECNU, thinking defaults off, and `ecnu-plus` uses `low` / `medium` /
+  `xhigh` effort tiers. Use `thinking.type`; do not copy `enable_thinking`,
+  `preserve_thinking`, or `chat_template_kwargs` into ECNU requests.
 
 Use the API's thinking control instead of trying to activate it with a
 "think step by step" phrase. Ask for a concise answer with evidence and checks;

references/api_reference.md

@@ -32,6 +32,7 @@ in environment variables; ticket URLs are also credentials.
 | Anthropic-compatible client | [Anthropic API](https://developer.ecnu.edu.cn/vitepress/llm/api/anthropic.html) | [SDK setup](examples.md#anthropic-sdk); investigate suffix errors only when they occur |
 | Embed an iframe | [Embed integration](https://developer.ecnu.edu.cn/vitepress/llm/api/embediframe.html) | Do not log or reuse one-time tickets |
 | Browser link that submits a question | [URL chat](https://developer.ecnu.edu.cn/vitepress/llm/api/urlchat.html) | Opening a submit link sends data; do not auto-open it as a documentation check |
+| Error status or response shape | [Error codes](https://developer.ecnu.edu.cn/vitepress/llm/error.html) | [Targeted diagnosis](workflows.md#start-from-the-symptom); keep the actual status and body type |
 
 ## Account and changing values
 

references/known_deviations.md

@@ -204,10 +204,11 @@ and credentials were not retained.
 
 ## Direct `ecnu-max` image input
 
-Current-contract note (documentation checked 2026-10-02, not a retest): the
-[2026-09-18 model change](https://developer.ecnu.edu.cn/vitepress/llm/model.html)
-made `ecnu-max` text-only again. Use `ecnu-plus` for image understanding.
-The resolved status below describes only the September 12 fixture.
+Current-contract note (documentation checked 2026-10-19, not a retest): the
+[2026-10-01 model update](https://developer.ecnu.edu.cn/vitepress/llm/model.html)
+moved `ecnu-max` to DeepSeek-V4.1-Flash-1017 with native image understanding.
+The 2026-09-18 text-only interval is historical, and the resolved status below
+still describes only the September 12 fixture.
 
 - **Tested at:** 2026-09-12; previous failure on 2026-08-23
 - **Environment:** live-2026-09-12-a, direct HTTP; historical live-2026-08-23-a
@@ -405,10 +406,12 @@ max default. Its original test date and status are retained.
 
 ## Verified coverage on 2026-09-12 through 2026-09-14
 
-**Current-contract note (2026-10-02):** This is historical coverage, not a
-current capability test. The model page now specifies max as text-only with
-512K context; use plus for image understanding and the current per-model
-thinking tiers. No live revalidation was performed for this note.
+**Current-contract note (2026-10-19):** This is historical coverage, not a
+current capability test. The model page now documents image understanding on
+both primary models; the max-vision result below predates the 2026-09-18
+text-only interval and the 2026-10-01 multimodal backend update. Use the
+current per-model thinking tiers. No live revalidation was performed for this
+note.
 
 Environment `live-2026-09-12-c` made characterization requests across two
 personal tokens on Windows x64, Node.js 24.14.1, over Asia/Shanghai dates

references/models.md

@@ -20,8 +20,12 @@ a measured quality or latency ranking.
 ## Select the capability, not just a new model name
 
 The [2026-09-30 release](https://developer.ecnu.edu.cn/vitepress/llm/release.html)
-added multimodal retrieval and image editing. Contract checked 2026-10-02;
-these are documented capabilities, not new live-test results.
+added multimodal retrieval and image editing. The
+[model page](https://developer.ecnu.edu.cn/vitepress/llm/model.html) also
+records the 2026-10-01 backend update: `ecnu-max` is now
+DeepSeek-V4.1-Flash-1017 and `ecnu-plus` is Qwen3.8-Flash-Next. Contract
+checked 2026-10-19; these are documented capabilities, not new live-test
+results.
 
 | Model | Backend in the current model page | Integration choice |
 |---|---|---|
@@ -31,19 +35,26 @@ these are documented capabilities, not new live-test results.
 | `ecnu-rerank-vl` | Qwen3-VL-Reranker-8B | Text/image query and candidates; rerank an already retrieved candidate set |
 | `ecnu-image` | qwen-image-2.1 | Generate from text or edit one existing image; different request formats and prompt handling |
 
+The same page currently lists `ecnu-max` with 512K context, up to 256K output,
+and `low` / `high` / `max` effort, and `ecnu-plus` with 256K context, up to
+128K output, and `low` / `medium` / `xhigh` effort. Per-user concurrency caps
+are 3 for `ecnu-max` and 5 for `ecnu-plus`, counted independently. Recheck
+those values before displaying or depending on them. `ecnu-tts` is
+Fun-CosyVoice3-0.5B with 16 voices and a 4096-character input limit.
+
 Use the [retrieval and image recipes](examples.md) for the differences that
 affect requests. Equal vector dimensions do not imply compatible embedding
 spaces: changing embedding models requires re-embedding the indexed items and
 using that same model and dimensions for queries. A reranker can change without
 replacing stored vectors; its relevance scores are not scientific or educational
 quality judgments and should not be compared across models.
 
-For image understanding, the current model page specifies `ecnu-plus`.
-`ecnu-max` currently uses DeepSeek-V4-Flash-0731 and is text-only; older
-DeepSeek-V4.1 and successful vision observations are historical, not current
-capability guarantees. Keep stable ECNU aliases in requests and recheck backend
-labels before displaying them. Do not relabel old generated assets as output
-from a newly announced backend.
+The current model page documents image understanding on both `ecnu-max` and
+`ecnu-plus`. The 2026-10-01 backend update moved `ecnu-max` to
+DeepSeek-V4.1-Flash-1017, ending the 2026-09-18 interval when it was text-only.
+Keep stable ECNU aliases in requests and recheck backend labels before
+displaying them. Do not relabel old generated assets as output from a newly
+announced backend.
 
 ## ECNU-specific boundaries
 

references/workbuddy_setup.md

@@ -4,7 +4,7 @@ Connect ECNU to WorkBuddy desktop as a custom OpenAI-compatible model source.
 The desktop implementation and startup behavior below were inspected on
 2026-09-12; they have not been revalidated on current WorkBuddy builds.
 The configuration follows the [ECNU model contract](https://developer.ecnu.edu.cn/vitepress/llm/model.html)
-checked on 2026-10-02, but this revised configuration has not been live-tested.
+checked on 2026-10-19, but this revised configuration has not been live-tested.
 
 ## Configuration file
 
@@ -36,9 +36,12 @@ Edit the JSON file directly.
 ## Configuration example
 
 Use `ecnu-reasoner` for thinking and `ecnu-max` for ordinary text requests.
-Both are currently text-only. The input/output limits below are conservative
-client budgets: together they stay below the documented 512K context, without
-assuming whether K means 1000 or 1024. They are not backend maximums.
+The entries below keep this client text-only; since 2026-10-01 the ECNU model
+page documents image understanding on both `ecnu-max` and `ecnu-plus`, so
+`supportsImages: false` is a client configuration choice, not a model limit.
+The input/output limits below are conservative client budgets: together they
+stay below the documented 512K context, without assuming whether K means 1000
+or 1024. They are not backend maximums.
 
 ```json
 [

references/workflows.md

@@ -26,9 +26,9 @@ These links are dated observations, not claims that the issue still reproduces.
 | An effort tier fails | Use the chosen model's [documented tiers](examples.md#thinking-and-tool-history); the [September max observation](known_deviations.md#unavailable-reasoning-effort-tiers) does not apply to plus |
 | TTS error parsing crashes | Tolerate non-JSON errors: [invalid voice](known_deviations.md#invalid-tts-voice-error-shape) |
 | PCM bytes arrive without format metadata | Configure the format explicitly: [missing headers](known_deviations.md#successful-tts-response-headers) |
-| Old max-vision success conflicts with current docs | Current max is text-only; the [September 12 fixture](known_deviations.md#direct-ecnu-max-image-input) predates the September 18 contract change |
+| Old max-vision notes conflict with current docs | Current docs list image understanding on both models; the [September 12 fixture](known_deviations.md#direct-ecnu-max-image-input) predates the 2026-09-18 text-only interval and the 2026-10-01 backend update |
 | `422` | Inspect `detail` and the relevant [request contract](api_reference.md); do not retry the unchanged request |
-| `429` | Check [current credits/quota](models.md); stop parallel retries |
+| `429` | Check [current credits/quota](models.md) and the independent per-user concurrency caps (`ecnu-max`: 3; `ecnu-plus`: 5); stop parallel retries |
 | Timeout or dropped connection after POST | Completion and debit may be unknown; do not automatically resubmit |
 
 A later release announcement does not by itself resolve a deviation. Do not