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feat(openrouter): B2 — Fast on OpenAI-backed slugs, no route pinning (#1886) - #2080

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Aug 19, 2026
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feat(openrouter): B2 — Fast on OpenAI-backed slugs, no route pinning (#1886)#2080
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Summary

Enables Codex Fast on OpenRouter for the OpenAI-backed slugs this repo ships — and corrects what #1886 specified for this provider, with the vendor documentation that retires it.

The umbrella's route pin is withdrawn, on evidence

#1886 required an atomic pin: only inject a tier alongside provider: { only: [...], allow_fallbacks: false }, so a tier could never reach an upstream that would silently bill for it. OpenRouter's own docs both remove the motivation and show the proposal would not have worked:

  • Tier endpoints are separate suffixed slugs (openai/priority, google-vertex/flex) and are explicitly not matched by base slugs. Pinning only: ["openai"] would have excluded the very endpoint that serves priority.
  • Priority tries tier endpoints first and falls back otherwise, and billing always follows the endpoint actually used — so the silent-overbilling risk the pin existed to prevent does not arise.
  • The response reports the tier actually served (default / flex / priority / null).

Pinning would therefore have converted a graceful capacity fallback into a hard failure while protecting against nothing. Downgrade safety rests on B0's confirmation model instead, which was built for exactly this contract. I'll update #1886's text to match.

What lands

  • Capability: exact-model true for openai/gpt-5.6-{sol,terra,luna}. The provider stays unclassified, and anthropic/claude-sonnet-5 is left out — OpenRouter does not list Anthropic among its priority upstreams.
  • Destination-guarded capability: a provider merely named openrouter but pointed at someone's own gateway must not inherit evidence gathered about openrouter.ai. Because OpenRouter's endpoint is fixed (a configured base URL is ignored at route time), the guard reads the operator's configured base URL, not the routed one — and catalog and runtime are both fed that same configured value, so A1's one-resolver invariant holds and the catalog cannot advertise what the runtime would withhold (or vice versa).
  • Chat response tier echo: the Chat surface now reads the upstream service_tier, closing the gap B0 left open. Without it, every OpenRouter Fast request would have recorded assumed even when OpenRouter told us it fell back to standard. Absence of the field still means assumed — never a fabricated downgrade.
  • Honest pricing: a confirmed priority result with no bundled tier price bills at the standard rate but is flagged a floor, since OpenRouter documents priority as "faster, higher cost". Scoped to canonical priority only; flex is cheaper, so the same argument would be false there.

A wrong turn worth recording

The first attempt scoped capability with the registry's existing preserveCustomDestination flag. It worked — but that flag also decides provider claiming and hosted-tool preference validation, and the full suite caught it changing which configs openrouter accepts (config.test.ts and management-provider-validation.test.ts, both sub-millisecond assertion failures, not flakes). The destination guard replaces it and touches nothing outside FastWire.

UI

Logs table: a confirmed-priority OpenRouter request shown as a floor next to a declined downgrade and a standard request

Three seeded OpenRouter requests on openai/gpt-5.6-sol. The upstream echo decides the rendering: service_tier: "priority" gives ≥$0.1105 (standard rate, marked a floor because OpenRouter publishes no bundled tier price), service_tier: "default" is a real downgrade and gets no marker, and a request that never asked for Fast stays ~$0.1105. All three totals match on purpose — only the marker differs.

Verification

Known convergence point

The pricing floor here is keyed on the provider id, while the parallel xAI unit (#2072, not yet merged) makes priority pricing declarative. When both land, these two paths should collapse into one declarative rule — noted so it is a planned follow-up rather than an oversight.

Part of #1886.

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Summary by CodeRabbit

  • New Features

    • Added OpenRouter Fast support for eligible OpenAI models.
    • Requests apply priority service tiers when supported and accurately handle provider responses.
    • Cost estimates identify standard pricing as a known lower bound for confirmed priority requests.
    • Logs display lower-bound, approximate, or unavailable cost labels.
  • Bug Fixes

    • Improved handling of downgraded, missing, or malformed service-tier responses.
  • Documentation

    • Documented OpenRouter Fast behavior, pricing, fallback, and response logging.
  • Localization

    • Added translated cost and lower-bound estimate messaging across supported languages.

olddonkey and others added 2 commits August 18, 2026 18:20
…te pinning

Phase B2 of the FastWire umbrella (lidge-jun#1886), and a documented
correction to what that issue proposed.

The umbrella specified an atomic route pin for OpenRouter — only inject a tier
alongside `provider: { only: [...], allow_fallbacks: false }` — to stop a tier
reaching an upstream that would silently bill for it. OpenRouter's own
documentation retires that requirement, and shows the proposal would not even
have worked:

- Tier endpoints are separate suffixed slugs (`openai/priority`), and they are
  explicitly NOT matched by base slugs. Pinning `only: ["openai"]` would have
  excluded the very endpoint that serves priority.
- Priority tries tier endpoints first and falls back otherwise, and billing
  always follows the endpoint actually used — so the silent-overbilling risk the
  pin existed to prevent does not exist.
- The response reports the tier actually served.

Pinning would therefore have turned a graceful capacity fallback into a hard
failure while protecting against nothing. Downgrade safety instead rests on B0's
confirmation model, which was built for exactly this contract.

What this adds:

- The three OpenAI-backed slugs we ship get exact-model capability. The provider
  stays unclassified, and `anthropic/claude-sonnet-5` is left out because
  OpenRouter does not list Anthropic among its priority upstreams.
- Registry model capability is now guarded by destination. A provider merely
  named `openrouter` but pointed at someone's own gateway must not inherit
  evidence gathered about openrouter.ai, and OpenRouter's endpoint is fixed, so
  the guard reads the operator's configured base URL rather than the routed one.
  Catalog and runtime both feed it that same configured value, keeping A1's
  one-resolver invariant intact.
- The Chat surface finally reads the upstream's `service_tier` echo, closing the
  gap B0 left open. Without it every OpenRouter Fast request would have recorded
  `assumed` even when OpenRouter told us it had fallen back to standard.
- A confirmed priority result with no bundled tier price is now billed at the
  standard rate but flagged a floor rather than silently reported as exact:
  OpenRouter documents priority as "faster, higher cost", so standard is provably
  a lower bound. Scoped to canonical priority only — flex is cheaper, so the same
  argument would be false there.

A first attempt scoped capability with the registry's `preserveCustomDestination`
flag. It worked, but that flag also decides provider claiming and hosted-tool
preference validation, and the full suite caught it changing which configs
`openrouter` accepts. The destination guard above replaces it and touches
nothing outside FastWire.

Full suite: 13361 pass / 10 skip / 1 fail — the pre-existing dev-side
key-login-live-update regression, which reproduces on pristine dev.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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@github-actions github-actions Bot added the enhancement New feature or request label Aug 19, 2026
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  • src/usage/cost.ts
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📝 Walkthrough

Walkthrough

OpenRouter Fast support now uses canonical model capabilities, observes response service tiers, marks applicable priority estimates as standard-price lower bounds, and displays that status in localized logs.

Changes

OpenRouter Fast capability and policy flow

Layer / File(s) Summary
Canonical capability declaration
src/providers/registry.ts, src/providers/derive.ts, src/config.ts
OpenRouter service-tier support applies only to three OpenAI GPT-5.6 model slugs and canonical OpenRouter destinations.
Policy and routing integration
src/providers/service-tier.ts, src/router.ts, src/routing/compatibility/behavior.ts, src/codex/catalog/provider-fetch.ts, src/server/responses/core.ts
Policy authority and routing use applicable registry capabilities and the selected provider configuration.
Capability validation
tests/service-tier-capability.test.ts, docs-site/src/content/docs/reference/configuration/providers.md
Tests and documentation cover supported models, overrides, noncanonical destinations, request injection, and response behavior.

Response tier observation

Layer / File(s) Summary
Adapter metadata capture
src/adapters/base.ts, src/adapters/openai-chat.ts
Stream and buffered parsers record service_tier values and mark malformed responses as unparseable.
Response-path wiring
src/server/responses/core.ts
Initial and continuation parsing receives active tier metadata.
Observability tests
tests/fastwire-observability.test.ts
Tests cover stream and non-stream parsing through the Responses bridge for priority, default, and absent tiers.

Lower-bound pricing and log display

Layer / File(s) Summary
Cost estimate propagation
src/usage/cost.ts, src/server/management/shared.ts
Applicable OpenRouter priority outcomes set priorityLowerBound, propagate it through aggregate estimates, and expose priority_lower_bound in estimate reasons.
Log formatting and aggregation
gui/src/pages/logs-cost-format.ts, gui/src/pages/Logs.tsx
Lower-bound totals use a prefix. Filtered totals and detailed cost values preserve the lower-bound flag.
Localized message catalog
gui/src/i18n/*.ts
Translations were added for approximate, lower-bound, unavailable, and priority lower-bound estimate states.
Pricing tests and evidence
gui/tests/logs-priority-lower-bound.test.ts, tests/fastwire-observability.test.ts, devlog/_plan/260818_fastwire_b2_openrouter/evidence/README.md
Tests and evidence cover lower-bound formatting, downgraded responses, and provider-specific pricing behavior.

Estimated code review effort: 4 (Complex) | ~45 minutes

Sequence Diagram(s)

sequenceDiagram
  participant OpenRouter
  participant OpenAIChatAdapter
  participant TierMetadata
  participant CostEstimator
  participant LogsUI
  OpenRouter->>OpenAIChatAdapter: return response with service_tier
  OpenAIChatAdapter->>TierMetadata: record service_tier and parse status
  TierMetadata->>CostEstimator: provide tier provenance
  CostEstimator->>LogsUI: return priorityLowerBound estimate
  LogsUI->>LogsUI: display lower-bound and localized labels
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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 43.75% which is insufficient. The required threshold is 80.00%. Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly summarizes the main changes: OpenRouter Fast support for OpenAI-backed model slugs and removal of route pinning.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
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github-actions Bot marked this pull request as draft August 19, 2026 01:29
olddonkey and others added 2 commits August 18, 2026 18:39
Screenshot evidence for lidge-jun#2080: the Logs table showing a
confirmed-priority OpenRouter request rendered as a floor (≥$) next to a
response-declined downgrade and a standard request (~$).

Taking this screenshot is what surfaced two defects the test suites missed: the
lower-bound marker disagreed with the parallel xAI unit's rendering, and the fix
for it initially reached only the detail panel because the table cell had its own
inline formatter. Both paths now share one implementation.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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Actionable comments posted: 1

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Inline comments:
In `@gui/src/pages/Logs.tsx`:
- Around line 243-250: Update formatEstimatedUsd to delegate value formatting to
the existing formatEstimatedUsdValue helper, passing the estimated total and
localeTag while preserving the unavailable-result handling. Remove the
duplicated Intl.NumberFormat, lower-bound marker, and invalid-value formatting
logic from formatEstimatedUsd.
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  • docs-site/src/content/docs/reference/configuration/providers.md
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  • gui/src/i18n/ja.ts
  • gui/src/i18n/ko.ts
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  • gui/src/pages/logs-cost-format.ts
  • gui/tests/logs-priority-lower-bound.test.ts
  • src/adapters/base.ts
  • src/adapters/openai-chat.ts
  • src/codex/catalog/provider-fetch.ts
  • src/config.ts
  • src/providers/derive.ts
  • src/providers/registry.ts
  • src/providers/service-tier.ts
  • src/router.ts
  • src/routing/compatibility/behavior.ts
  • src/server/management/shared.ts
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  • src/usage/cost.ts
  • tests/fastwire-observability.test.ts
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gui/src/pages/Logs.tsx (1)

341-356: 🎯 Functional Correctness | 🟠 Major | ⚡ Quick win

Require all included estimates to be lower bounds before marking the total.

Line 355 uses ||=, so one lower-bound estimate marks the entire conversation total as a lower bound. If the filtered logs contain one lower-bound estimate and one ordinary estimate, the sum is displayed with even though part of the sum is only an estimate.

Track whether at least one priced estimate exists and whether every included estimate has priorityLowerBound === true. Set the aggregate flag only when both conditions are true. Add a mixed-estimate regression test.

Proposed aggregation fix
-  let priorityLowerBound = false;
+  let priorityLowerBound = true;
+  let pricedEstimates = 0;
...
-      priorityLowerBound ||= cost?.kind === "value" && cost.estimate.priorityLowerBound === true;
+      pricedEstimates += 1;
+      priorityLowerBound &&= cost?.kind === "value" && cost.estimate.priorityLowerBound === true;
...
-    priorityLowerBound,
+    priorityLowerBound: pricedEstimates > 0 && priorityLowerBound,

Also applies to: 360-364

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.

In `@gui/src/pages/Logs.tsx` around lines 341 - 356, Update the cost aggregation
in the Logs totals loop to track whether any priced estimate is included and
whether every included priced estimate has priorityLowerBound set to true,
rather than using ||= on priorityLowerBound. Set the aggregate lower-bound flag
only when both conditions hold, while preserving existing handling for
unsupported, unpriced, and invalid entries. Add a regression test covering one
lower-bound estimate combined with one ordinary estimate.
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Inline comments:
In `@gui/src/pages/logs-cost-format.ts`:
- Around line 7-10: Update formatEstimatedUsdValue and formatEstimatedUsd to use
locale-provided approximate, lower-bound, and unavailable labels, removing
hardcoded user-visible text. Format USD amounts with Intl.NumberFormat using
currency style and USD so currency placement and separators follow the locale.
Compose labels through the existing i18n flow in Logs.tsx or pass them into the
formatters, and add coverage for a non-en-US locale.

---

Outside diff comments:
In `@gui/src/pages/Logs.tsx`:
- Around line 341-356: Update the cost aggregation in the Logs totals loop to
track whether any priced estimate is included and whether every included priced
estimate has priorityLowerBound set to true, rather than using ||= on
priorityLowerBound. Set the aggregate lower-bound flag only when both conditions
hold, while preserving existing handling for unsupported, unpriced, and invalid
entries. Add a regression test covering one lower-bound estimate combined with
one ordinary estimate.
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Addressed all current review findings in d49538c and 9cd3c1c. Estimated costs now use one shared Intl USD formatter with typed i18n labels and translated locale values. Conversation totals are marked as lower bounds only when at least one priced estimate exists and every priced estimate is a lower bound; mixed, all-lower-bound, and unpriced-only cases are covered. Verification: focused cost and locale tests 18 pass / 0 fail; full root suite 13,416 pass / 10 skip / 0 fail across 852 files; full GUI suite 951 pass / 0 fail across 165 files; GUI lint, i18n lint, build, app typecheck, and diff check pass. Please re-review the updated head.

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@lidge-jun

lidge-jun commented Aug 19, 2026

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리뷰 · 우선순위 62 / 80

#1886 B2의 OpenRouter 유닛이다. openai/gpt-5.6-{sol,terra,luna}에만 exact-model Fast를 열고, #1886이 요구했던 provider.only + allow_fallbacks: false pin은 철회한다. OpenRouter 문서상 priority는 접미사 엔드포인트이고 과금은 실제 엔드포인트를 따르므로, pin은 침묵 과잉청구를 막지 못하고 용량 fallback만 깨뜨린다. hygiene 통과, review-ready, 체크리스트 4/4, 저자가 리뷰 지적을 후속 커밋으로 닫았다. dev의 FastWire 계약(A1 한 리졸버, B0 확인 모델)과 맞아서 62다. 29파일이라 70은 아니다.

능력 선언은 레지스트리 exact-model이고 Anthropic 슬러그는 빠진다. 목적지 가드가 있다. 이름만 openrouter이고 게이트웨이가 다른 설정은 openrouter.ai 증거를 못 물려받는다. OpenRouter 엔드포인트가 고정이라 가드는 설정된 base URL을 보고, 카탈로그와 런타임이 같은 값을 쓴다. 첫 시도의 preserveCustomDestination은 claiming/hosted-tool 검증까지 바꿔서 버렸고, 이 가드는 FastWire 안에만 있다.

관측은 Chat 응답의 service_tier echo다. src/adapters/openai-chat.ts가 스트림과 비스트림에서 observeResponseServiceTier를 부른다. echo가 없으면 assumed이지 가짜 다운그레이드가 아니다. 확인된 priority인데 번들 가격이 없으면 표준 요금으로 계산하고 priorityLowerBound를 켠다. GUI는 하한 마커와 번역된 하한 문구를 보여 준다. conversation total은 가격 난 추정치가 전부 하한일 때만 하한이다. 저자가 적은 혼합/전부하한/미가격 케이스가 그 계약이다.

테스트가 capability와 destination, echo, 가격 floor, GUI, 그리고 provider.only/order/allow_fallbacks가 안 나가는 것을 고정한다. #2072와 가격 선언이 아직 두 갈래다. 저자도 후속으로 한 규칙으로 접자고 적었다. Fast를 켜는 일이라 과금 UI가 틀리면 사용자가 손해를 본다. 하한 표시는 그 위험을 숨기지 않으려는 선택이다.

해결방안

메인테이너가 pin 철회와 목적지 가드를 읽고 동의하면 머지할 수 있다. #2072와 같이 둘 때 가격 floor가 프로바이더 id 특수 케이스와 선언적 xAI 규칙으로 갈라지지 않게, 머지 직후 한 후속 PR로 접어라. 이 PR에서 그 통합까지 기다릴 필요는 없다. Anthropic OpenRouter Fast는 문서에 없으니 넣지 마라.

이 댓글은 grok-bot이 작성했습니다

@lidge-jun

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The design is the good part, and I want to say so before the blocker: no route pinning, capability restricted to the canonical base URL, response service_tier observed rather than assumed, and confirmed priority costs rendered as lower bounds. That is the shape this should have.

Blocker: the capability itself is asserted, not evidenced — the same class of finding that is still open on #2072.

src/providers/registry.ts:1372-1380 declares Fast true for three exact OpenRouter IDs. The positive test reads that same map back and expects the same literals (tests/service-tier-capability.test.ts:52-62), so it proves the wiring, not that the tier exists. And the attached evidence is three seeded local requests (devlog/_plan/260818_fastwire_b2_openrouter/evidence/README.md:3-15), not a live endpoint listing or a paid canary.

OpenRouter's own docs say service tiers apply to select models. The Sol model page confirms the ID and that OpenAI is one of several serving providers — it does not show a priority endpoint for Sol, Terra, or Luna.

Why this is a blocker rather than a nit: being wrong here spends the user's money. A model we declare Fast-capable that is not gets a priority-priced request the user did not knowingly opt into.

What would unblock it: evidence that these three IDs actually expose a priority endpoint — an endpoint listing showing the tier, or one real (not seeded) request per model with the service_tier echo captured. If only some of the three qualify, ship those.

The negative guards all check out (Anthropic, explicit-false, noncanonical destination), and the 29-file breadth is coherent rather than scope creep.

An assumed Fast attempt reported the standard total with no uncertainty marker,
so the UI received a definite price for a request whose served tier the provider
never echoed. OpenRouter bills by the tier actually served and documents
priority as more expensive, so an unmarked standard total can understate the
real charge.

The confirmed case was already a lower bound because the premium endpoint price
is not bundled here. The assumed case needs the same marker for a stronger
reason: the outcome itself was never observed. Same treatment, different
justification.

Driven red: restricting the predicate back to confirmed-only fails the new
regression and nothing else.
@lidge-jun
lidge-jun merged commit 4edf795 into lidge-jun:dev Aug 19, 2026
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