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web: model tooltip always shows "No reasoning" because capabilities.reasoning is hard-coded false

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評価

難易度
2/5
見積もり時間
1〜3時間
初心者へのやさしさ
68/100
issue の種類
バグ
明瞭さ
明確に書かれている
活発さ
活発
技術スタック
typescript
領域
frontend

調査の方向性

サーバーのモデルをクライアント側のモデル形式に変換する Web UI のコードを見つけます。issue では、関連データとして capabilities.reasoning の代入とモデルの variants が挙げられています。variants がどのように表現され、tooltip が capability をどのように読み取るかを確認し、モデルのマッピングやモデルピッカーに関する既存のテストがあるか調べます。reasoning バリアントを持つモデルには「Allows reasoning」、持たないモデルには「No reasoning」と表示され、対応するバリアントも引き続き利用できれば完了です。

索引モデルが issue の本文から書いたものです。

説明

pending close triaging

Summary

In the Web UI, the model picker tooltip reports "No reasoning" for every model, even ones that clearly expose reasoning. Reasoning detection is driven by capabilities.reasoning, which the client hard-codes to false (and which the V2 model payload never populates) instead of being derived from the model's variants (thinking / effort). Result: users believe no model supports reasoning.

Environment

  • opencode version: 2.0.26
  • OS: Linux VM-0-3-ubuntu 7.0.0-38-generic #38-Ubuntu SMP PREEMPT_DYNAMIC Fri Sep 4 09:10:14 UTC 2026 x86_64 GNU/Linux
  • Terminal: Web UI in a browser (client served by opencode serve --service on :port); shell TERM=xterm-256color
  • Shell: /bin/bash
  • Install/channel: latest installer, /home/ubuntu/.opencode/bin/opencode
  • Active plugins: none found in config

Reproduction

  1. /connect → select the built-in OpenCode Console provider and enter an API key (provider id opencode).
  2. Start/serve the Web UI (opencode serve; in our case the shared background service at http://<host>:<port>).
  3. Open the model picker and hover/inspect a model that supports reasoning, e.g. Claude Haiku 5.5 (opencode/claude-haiku-5-5).
  4. The tooltip's Reasoning row shows "No reasoning".

The same happens for every model in the provider, e.g. opencode/gpt-5.5, opencode/claude-opus-5-5, opencode/glm-5.3.

Expected Behavior

A model that exposes reasoning variants should show "Allows reasoning" (and offer the corresponding variants).

Actual Behavior

Every model shows "No reasoning", regardless of its actual capabilities. No error is raised.

Additional Context

Server truth contradicts the tooltip. opencode api get /api/model returns reasoning variants for opencode/claude-haiku-5-5:

{
  "id": "claude-haiku-5-5",
  "providerID": "opencode",
  "package": "@opencode/ai/providers/anthropic",
  "capabilities": { "tools": true, "input": ["text","image","pdf"], "output": ["text"] },
  "variants": [
    { "id": "none",    "settings": { "thinking": { "type": "disabled" } } },
    { "id": "low",     "settings": { "thinking": { "type": "adaptive", "display": "summarized" }, "effort": "low" } },
    { "id": "medium",  "settings": { "thinking": { "type": "adaptive", "display": "summarized" }, "effort": "medium" } },
    { "id": "high",    "settings": { "thinking": { "type": "adaptive", "display": "summarized" }, "effort": "high" } },
    { "id": "xhigh",   "settings": { "thinking": { "type": "adaptive", "display": "summarized" }, "effort": "xhigh" } },
    { "id": "max",     "settings": { "thinking": { "type": "adaptive", "display": "summarized" }, "effort": "max" } }
  ]
}

The V2 OpenAPI Model.Capabilities schema only defines { tools, input, output } — there is no reasoning field. Reasoning is expressed through variants (settings.thinking / settings.effort) and compatibility.reasoningField.

Client hard-codes the flag. In the served client bundle (_assets/runtime-*.js), server models are mapped into a models.dev-shaped object with reasoning forced to false:

t.models[e.id] = {
  id: e.id,
  providerID: e.providerID,
  api: { id: e.modelID, url: ``, npm: e.package ?? t.id },
  name: e.name,
  family: e.family,
  capabilities: {
    temperature: false,
    reasoning: false,          // <-- hard-coded; never derived from e.variants
    attachment: e.capabilities.input.some(x => x !== `text`),
    toolcall: e.capabilities.tools,
    input:  { text: ..., audio: ..., image: ..., video: ..., pdf: ... },
    output: { text: ..., audio: ..., image: ..., video: ..., pdf: ... },
    interleaved: false,
  },
  ...
  variants: Object.fromEntries(e.variants.map(e => [e.id, e.settings ?? {}])),
}

The tooltip then chooses its label from this flag (i18n keys in the client bundle):

"model.tooltip.reasoning":         "Reasoning"
"model.tooltip.reasoning.allowed": "Allows reasoning"
"model.tooltip.reasoning.none":    "No reasoning"

Because capabilities.reasoning is always false, the none label is always selected.

Impact: display-only. Selecting a reasoning variant (e.g. #high) still works, but the UI misleads users into thinking reasoning is unsupported. Suggested fix: derive reasoning from whether the model exposes reasoning variants (e.g. any variant carrying settings.thinking), or from a dedicated capability on the model payload.

Frequency: reproducible consistently on every load.

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