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fix(docs): the alias targets and effort defaults match the docs today (green)

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Verified 2026-10-02 against code.claude.com/docs/en/model-config and
/sub-agents. On the Anthropic API opus -> Opus 5.5 and sonnet ->
Sonnet 5.5 (default effort medium), fable -> Fable 5.1 (default high).
Three more claims in the same section were false and are corrected:
an agent without effort: inherits the session level, not the model
default; MAX_THINKING_TOKENS=0 has no effect on Opus 5.5, Sonnet 5.5
or Fable; effort is capped by maxEffortLevel or an organization cap.
"Mythos-class" is replaced by the docs' own wording. History is
untouched (CHANGELOG, the measurement docs, the Path C line).

STATE said seven files but listed six; the red pin found exactly
these six. The end-state registry line names a CC changelog fact and
stays as history.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Kjell Tore Guttormsen 2026-10-02 21:43:51 +02:00
commit e4e37f91ef
Signed by: ktg
SSH key fingerprint: SHA256:JakMjO6FTBBzN0Bhfj9saOoEjaFxlSdYuZQQpM/lF9Q
6 changed files with 33 additions and 28 deletions
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2
docs/operations.md
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@ -37,7 +37,7 @@ Four built-in model profiles plus operator-defined `<custom>.yaml`. Each profile
| `economy` | sonnet | sonnet | sonnet | sonnet | sonnet | sonnet | ⚠ **Experimental** (uncalibrated Jaccard floor) — lowest cost; high-confidence small-scope tasks (operator-opt-in via `--profile economy`) |
| `balanced` | sonnet | sonnet | opus | sonnet | opus | sonnet | Mixed — opus where reasoning depth pays off (operator-opt-in via `--profile balanced`) |
| `premium` (default) | opus | opus | opus | opus | opus | opus | Maximum quality — Opus on every phase. Default since 2026-05-13 operator request; also the hardcoded resolver default returned by `resolveProfile()` in `lib/profiles/resolver.mjs` |
| `fable` | fable | fable | fable | fable | fable | fable | Max quality — Fable 5 (Mythos-class, above Opus) on every phase (operator-opt-in via `--profile fable`); reasoning effort inherits from the session — see `docs/profiles.md` §Model & effort axes |
| `fable` | fable | fable | fable | fable | fable | fable | Max quality — Fable 5.1 (the most capable model in Claude Code) on every phase (operator-opt-in via `--profile fable`); reasoning effort inherits from the session — see `docs/profiles.md` §Model & effort axes |
### Lookup order

39
docs/profiles.md
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@ -14,7 +14,7 @@ Four pre-defined tiers ship with the plugin (fable added in v5.9), located at
| `economy` | sonnet | sonnet | sonnet | sonnet | sonnet | sonnet | ⚠ **Experimental** (uncalibrated Jaccard floor) — lowest cost; small-scope tasks where you have high confidence the brief is right |
| `balanced` | sonnet | sonnet | opus | sonnet | opus | sonnet | Mixed — opus where reasoning depth pays off (plan synthesis + adversarial review); opt-in via `--profile balanced` |
| `premium` (default) | opus | opus | opus | opus | opus | opus | Maximum quality — Opus on every phase + external research on (default since the 2026-05-13 operator decision) |
| `fable` | fable | fable | fable | fable | fable | fable | Max quality — Fable 5 (Mythos-class, above Opus) on every phase; opt-in via `--profile fable`; reasoning effort inherits from the session (see Model & effort axes) |
| `fable` | fable | fable | fable | fable | fable | fable | Max quality — Fable 5.1 (the most capable model in Claude Code) on every phase; opt-in via `--profile fable`; reasoning effort inherits from the session (see Model & effort axes) |
`premium` is the default tier — set by the 2026-05-13 operator decision and
matched by the hardcoded resolver default in `lib/profiles/resolver.mjs`. It
@ -23,7 +23,7 @@ roughly 5× the sub-agent cost of an all-sonnet run, accepted as a deliberate
trade-off. Drop to `--profile balanced` (opus only on the two phases where
quality matters most — Plan synthesis + Review — and sonnet everywhere else)
or `--profile economy` (sonnet everywhere) when cost or latency matters more
than depth. Step up to `--profile fable` (Fable 5 on every phase) when
than depth. Step up to `--profile fable` (Fable 5.1 on every phase) when
maximum quality is wanted end-to-end and cost is not a constraint.
`economy` is *strictly experimental* in v4.1, and says so in the profile
@ -38,19 +38,21 @@ back to `balanced`.
## Model & effort axes
`opus`, `sonnet`, and `fable` are model **aliases**, not pinned ids. As of
Claude Code 2.1.154 the `opus` alias resolves to **Opus 4.8**, whose default
reasoning effort is **`high`**; `sonnet` resolves to Sonnet 4.6; `fable`
resolves to **Fable 5** (Mythos-class, positioned above Opus), whose default
reasoning effort is also `high`. The profile table above selects *which
alias* runs each phase — it does not touch reasoning effort.
`opus`, `sonnet`, and `fable` are model **aliases**, not pinned ids. On the
Anthropic API (verified 2026-10-02 against the Claude Code model-config docs)
the `opus` alias resolves to **Opus 5.5** and `sonnet` to **Sonnet 5.5**, both
with default reasoning effort **`medium`**; `fable` resolves to **Fable 5.1**
(the most capable model in Claude Code), whose default reasoning effort is
**`high`**. Other providers resolve `opus` and `sonnet` to other versions. The
profile table above selects *which alias* runs each phase — it does not touch
reasoning effort.
**Reasoning effort inherits from the session.** Voyage effort (orchestration
shape — which agents/passes run) and model reasoning effort are different
axes. Fable 5's default reasoning effort is `high`, NOT xhigh, and switching
model resets effort to the model default — xhigh does not follow the model.
To run the fable tier at xhigh, set it at session level: `/effort xhigh`, the
`effortLevel` setting, or `CLAUDE_CODE_EFFORT_LEVEL`.
axes. Fable 5.1's default reasoning effort is `high`, NOT xhigh, and Claude
Code saves effort per model, so a level saved for one model does not carry to
another. To run the fable tier at xhigh, choose it explicitly: `/effort xhigh`,
`--effort xhigh`, or `CLAUDE_CODE_EFFORT_LEVEL`.
Two different things share the word "effort" in Voyage. They are **orthogonal
axes** — same name, different mechanism:
@ -69,7 +71,7 @@ per-phase `model` (gated against `['sonnet','opus','fable']`). It never emits
native `effort:`.
**Native `effort:` on agents.** Voyage sets the reasoning axis statically on
selected agents, additively over the Opus-4.8 default:
selected agents, overriding the session level:
- **Retrieval agents → `medium`:** `task-finder`, `git-historian`,
`dependency-tracer`, `architecture-mapper` (structured discovery, not deep
@ -77,12 +79,15 @@ selected agents, additively over the Opus-4.8 default:
- **Adversarial-reasoning agents → `high`:** `plan-critic`, `risk-assessor`,
`contrarian-researcher`, `review-coordinator` (synthesis and stress-testing
where reasoning depth pays off).
- **All other agents:** unset → inherit the model default (Opus 4.8 = `high`).
- **All other agents:** unset → inherits the session's effort level (a session
that nothing sets runs at its model's default — `medium` on Opus 5.5).
Native-effort precedence (harness): env `CLAUDE_CODE_EFFORT_LEVEL` > frontmatter
`effort:` > session setting > model default. `MAX_THINKING_TOKENS=0` (or
`--thinking disabled`) overrides effort entirely. Enterprise `availableModels`
constrains the *model* alias only — it does **not** bound effort.
`effort:` > session setting > model default, and a `maxEffortLevel` setting or
an organization effort cap still limits the result. `MAX_THINKING_TOKENS=0` has
no effect on Opus 5.5, Sonnet 5.5 or the Fable models: thinking cannot be turned
off there. `availableModels` restricts which models can be selected — it does
**not** bound effort.
## Decision tree