feat(ui): show in the log drawer and session sidebar when an auto-router served a request

[tin-berri]

TLDR

Problem this solves:

• The logs already show which model served a request, but nothing shows that an auto-router picked it
• The requested name is already on every spend-log row as model_group, and both UI endpoints already return it; the dashboard type dropped the field

How it solves it:

• The request drawer header names the router in a badge, and the session sidebar swaps that entry's leading icon
• Decides "is this an auto-router" from the deployment list rather than from model_group != model, which is true for ordinary aliases too

Relevant issues

• Makes it visible in the request drawer and the session view that an auto-router chose the model
• Reads the auto-router set once per logs tree and shares it through context, so the two surfaces cannot disagree
• No backend, schema or migration change; the data was already on the wire

Linear ticket

Resolves LIT-4748

Pre-Submission checklist

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• I have added meaningful tests
• My PR passes all CI/CD checks (e.g., lint, format, unit tests)
• My PR's scope is as isolated as possible; it only solves 1 specific problem
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Delays in PR merge?

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Screenshots / Proof of Fix

Ran a local proxy against real Anthropic with one auto-router (smart-router, a complexity router over claude-haiku / claude-sonnet / claude-opus) plus two plain aliases, then read back what the UI endpoints serve

for M in smart-router claude-haiku claude-sonnet; do
  curl -s http://localhost:4000/v1/chat/completions \
    -H "Authorization: Bearer sk-lit4748" -H "Content-Type: application/json" \
    -d "{\"model\":\"$M\",\"messages\":[{\"role\":\"user\",\"content\":\"say hi in 3 words\"}],\"max_tokens\":20,\"litellm_session_id\":\"lit4748-demo\"}"
done

curl -s "http://localhost:4000/spend/logs/ui?page=1&page_size=5&start_date=2020-01-01%2000:00:00&end_date=2030-01-01%2000:00:00" \
  -H "Authorization: Bearer sk-lit4748"

Both /spend/logs/ui and /spend/logs/session/ui return model_group on every row

model_group='claude-sonnet' model='anthropic/claude-sonnet-4-5'
model_group='claude-haiku'  model='anthropic/claude-haiku-4-5'
model_group='smart-router'  model='anthropic/claude-haiku-4-5'

This is also why the indication is not driven by comparing the two columns. All three rows have model_group != model, because that is what a model_name alias is; only the third row went through an auto-router. The auto-routed row is otherwise indistinguishable server side, with the same model_id as the direct claude-haiku row and an identical metadata key set, so the requested name is matched against the deployments whose litellm_params.model starts with auto_router/

$ curl -s http://localhost:4000/v2/model/info -H "Authorization: Bearer <key>"
model_name='claude-haiku'  litellm_params.model='anthropic/claude-haiku-4-5'
model_name='claude-sonnet' litellm_params.model='anthropic/claude-sonnet-4-5'
model_name='claude-opus'   litellm_params.model='anthropic/claude-opus-4-8'
model_name='smart-router'  litellm_params.model='auto_router/complexity_router'

Verified that a non-admin virtual key gets the same litellm_params.model values from that endpoint, so the indication renders for non-admins too

Type

🆕 New Feature

Changes

• LogEntry carries model_group, and useAutoRouterModelGroups resolves the set of auto-router model groups from every page of /v2/model/info, keyed on the auto_router/ prefix so complexity, adaptive and quality routers are all covered
• New AutoRouterTag and AutoRouterModelGroupsProvider in shared/table_cells, mounted once in the logs panel so both surfaces share one lookup
• Drawer header shows a badge naming the router next to the provider; the session sidebar entry swaps its leading icon
• TraceEventRow's icon choice moves into a small TraceEventIcon with early returns, which drops two grandfathered no-nested-ternary suppressions
• Nothing renders when the model list has not loaded, when the request failed, or outside the provider, so a row is never mislabelled

Things a reviewer will ask about

The indication is a lookup rather than a string comparison because model_group != model holds for every plain alias and every wildcard deployment, so a mismatch-based badge would fire on nearly every row and single out nothing. AutoRouterTag reads its set from context with an empty-set default instead of calling the query hook itself, so any consumer outside a provider keeps rendering without a QueryClient

Left alone deliberately: model_info_view.tsx and edit_auto_router_modal.tsx hand-roll a narrower auto_router/complexity_router check. That asks a different question, namely whether the complexity-router edit UI applies, and widening it to the general prefix would wrongly show that UI for adaptive and quality routers

QA runbook

1. Start a proxy with an auto-router and at least one plain alias, for example a smart-router model whose litellm_params.model is auto_router/complexity_router alongside a claude-haiku model whose litellm_params.model is anthropic/claude-haiku-4-5
2. Send three requests so there is one routed row and two direct rows, passing the same litellm_session_id on all three so they group into one session

for M in smart-router claude-haiku claude-sonnet; do
  curl -s http://localhost:4000/v1/chat/completions \
    -H "Authorization: Bearer $LITELLM_MASTER_KEY" -H "Content-Type: application/json" \
    -d "{\"model\":\"$M\",\"messages\":[{\"role\":\"user\",\"content\":\"say hi in 3 words\"}],\"max_tokens\":20,\"litellm_session_id\":\"lit4748-demo\"}"
done

3. Go to http://localhost:4000/ui/?page=logs and click the smart-router row. The drawer header shows the resolved model, the provider, then a badge naming smart-router
4. Click a claude-haiku or claude-sonnet row. The header shows no badge, exactly as before this PR
5. Click the session id to open the session view. In the left trace list the auto-routed entry carries the router icon while the two direct entries keep the default icon
6. Remove the auto-router from the config and reload. Every row and every session entry renders exactly as before this PR

Final Attestation

• The tests check the right things, including the edge cases, and regressions in the respective real-world customer use-cases are not possible after this PR

---

Note

Low Risk
Dashboard-only, read-only UI over existing log and model-info APIs; mislabeling is avoided by not rendering until the router set is known.

Overview
Request logs now surface auto-router routing in the drawer header and session trace sidebar, using model_group from spend-log rows and a shared deployment lookup instead of comparing requested vs resolved model names.

LogEntry gains optional model_group. useAutoRouterModelGroups loads all pages of /v2/model/info, treats deployments whose litellm_params.model starts with auto_router/ as routers, and exposes their public model_name set. AutoRouterModelGroupsProvider mounts once on the request logs panel so drawer header and sidebar share one cached lookup.

The drawer header shows an AutoRouterTag badge naming the router when model_group matches that set. Session sidebar rows use the waypoints icon for auto-routed entries (via TraceEventIcon). Tags and icons stay hidden while the lookup is loading, on failure, or outside the provider so rows are not mislabeled.

^{Reviewed by Cursor Bugbot for commit 42aba4f. Bugbot is set up for automated code reviews on this repo. Configure here.}

[greptile-apps]

Greptile Summary

Adds auto-router indicators to request logs and session details.

• Fetches every page of model deployments and derives auto-router model groups from the auto_router/ prefix
• Shares the derived groups through a logs-level React context
• Displays the router name in the request drawer and a router icon in session entries
• Extends the spend-log UI type with model_group and adds focused tests

Confidence Score: 5/5

The PR appears safe to merge

No blocking failures remain

Important Files Changed

Filename	Overview
ui/litellm-dashboard/src/app/(dashboard)/hooks/models/useModels.ts	Adds a paginated query that derives the complete set of configured auto-router model groups
ui/litellm-dashboard/src/components/shared/table_cells/AutoRouterTag.tsx	Adds shared context, tag, icon, and lookup helpers for auto-router indicators
ui/litellm-dashboard/src/components/view_logs/LogDetailsDrawer/LogDetailsDrawer.tsx	Uses the shared lookup to select the auto-router icon for session trace entries
ui/litellm-dashboard/src/components/view_logs/LogDetailsDrawer/DrawerHeader.tsx	Shows the requested auto-router model group beside model and provider details
ui/litellm-dashboard/src/components/view_logs/RequestLogsPanel.tsx	Mounts one auto-router model-group provider around the logs surfaces

_{Reviews (3): Last reviewed commit: "feat(ui): show in the log drawer and ses..." | Re-trigger Greptile}

[codspeed-hq]

Merging this PR will not alter performance

✅ 31 untouched benchmarks

---

_{Comparing litellm_lit4748_autorouter_logs (e29c2d8) with litellm_internal_staging (43e7b96)¹}

Footnotes

1. No successful run was found on litellm_internal_staging (e906a7e) during the generation of this report, so 43e7b96 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[tin-berri]

@greptileai

[tin-berri]

@greptileai

[devin-ai-integration]

Runtime test of the latest commit (42aba4f32a)

Ran the branch locally against real Anthropic APIs with a smart-router deployment (auto_router/complexity_router, tiers -> anthropic haiku/sonnet/opus), sent fresh chat requests through it, then inspected the Logs page and a log detail drawer in the Admin UI dev server

This commit moves the auto-router indicator out of the Logs table and into the log detail drawer: a Waypoints badge with the router group name in the header, and a Waypoints icon (replacing Sparkles) on the auto-routed event in the trace sidebar

Drawer header shows the Waypoints "smart-router" badge; Request Details has no badge

Logs table no longer shows the old pill under the model

Trace sidebar uses the Waypoints icon for the auto-routed event

Assertions, all passed

• The Logs table shows only the resolved model with no auto-router pill
• The drawer header shows a Waypoints badge reading smart-router, and Request Details shows the model with no badge
• The auto-routed event in the trace sidebar uses the Waypoints icon instead of Sparkles

Tested by Devin: https://app.devin.ai/sessions/59777c74e423429aa9889a61d08cd1e3

[tin-berri]

bugbot run

[cursor]

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^{Reviewed by Cursor Bugbot for commit 42aba4f. Configure here.}