Label LLM eval runs with the model llama-server has loaded

The bake-off in #278/#250 needs two models' scores side by side, and the
report names only carried the config, so the rows were indistinguishable.
ModelID reads /v1/models instead of taking a string that goes stale.
New target: make eval-models MAVEN_LLM_URL=...

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CGeSZxh1DCtRxmFVSYVGvJ

Makefile

@@ -16,7 +16,7 @@ PIPER_BIN     := $(shell pwd)/deps/piper/piper
 PIPER_MODEL   := $(shell pwd)/models/tts/ru_RU-irina-medium.onnx
 PIPER_ESPEAK  := $(shell pwd)/deps/piper/espeak-ng-data
 
-.PHONY: all build build-stt build-tts build-daemon build-client build-waked build-web build-poll build-caldav clean test run-stt run-tts run-web download-embedder deps-go eval-router
+.PHONY: all build build-stt build-tts build-daemon build-client build-waked build-web build-poll build-caldav clean test run-stt run-tts run-web download-embedder deps-go eval-router eval-models
 
 all: build
 
@@ -83,6 +83,21 @@ MAVEN_ONNX_LIB ?= $(shell pwd)/deps/onnxruntime-linux-x64-1.26.0/lib/libonnxrunt
 eval-router:
 	MAVEN_ONNX_LIB="$(MAVEN_ONNX_LIB)" $(GO) test -v -count=1 ./internal/router/eval/
 
+# eval-models — score ONE llama-server against the same fixture, for the
+# resident-model bake-off (#278, #250). Start a server with the gguf you want,
+# then:
+#
+#   make eval-models MAVEN_LLM_URL=http://127.0.0.1:18100
+#
+# The report names carry the model llama-server reports, so runs from two
+# checkpoints stay apart. Only the LLM test runs — the classifier baselines do
+# not depend on the model and take the ONNX runtime with them.
+MAVEN_LLM_URL ?= http://127.0.0.1:18099
+
+eval-models:
+	MAVEN_LLM_URL="$(MAVEN_LLM_URL)" $(GO) test -v -count=1 -timeout 60m \
+		-run TestLLMRouterBaseline ./internal/router/eval/
+
 run-stt: build-stt
 	LD_LIBRARY_PATH="$(shell pwd)/deps/lib" \
 		./mavsttd -socket /tmp/maven/stt.sock -model $(WHISPER_MODEL)

internal/router/eval/llmrouter_test.go

@@ -23,7 +23,11 @@ import (
 //
 //	llama-server -m /mnt/hdd1/llms/qwen3.5/Qwen3.5-0.8B.Q4_K_M.gguf \
 //	  --host 127.0.0.1 --port 18099 -c 2048 -ngl 99
-//	MAVEN_LLM_URL=http://127.0.0.1:18099 make eval-router
+//	MAVEN_LLM_URL=http://127.0.0.1:18099 make eval-models
+//
+// Every report name carries the model llama-server reports over /v1/models, so
+// a bake-off across checkpoints (#278, #250) produces tables you can tell
+// apart. Point the variable at one server at a time.
 //
 // Three configurations, because "the LLM router" is ambiguous and the three
 // numbers answer different questions:
@@ -53,6 +57,14 @@ func TestLLMRouterBaseline(t *testing.T) {
 	}
 
 	ctx := context.Background()
+	model, err := ModelID(ctx, base)
+	if err != nil {
+		// Not fatal: an unlabelled score is still a score. But say so loudly,
+		// because an unlabelled row in a bake-off table is worthless.
+		t.Logf("could not read model id from %s: %v — reports will say %q", base, err, "unknown-model")
+		model = "unknown-model"
+	}
+	t.Logf("scoring model %s at %s", model, base)
 	lr := router.NewLLMRouter(client)
 
 	// llm-only: the LLM stage in isolation. Route returns (Decision, ok, err);
@@ -68,7 +80,7 @@ func TestLLMRouterBaseline(t *testing.T) {
 		}
 		return d, nil
 	})
-	repLLM, err := Score(ctx, "llm-only (0.8B, as deployed)", llmOnly, f)
+	repLLM, err := Score(ctx, "llm-only ("+model+", as deployed)", llmOnly, f)
 	if err != nil {
 		t.Fatalf("Score llm-only: %v", err)
 	}
@@ -77,7 +89,7 @@ func TestLLMRouterBaseline(t *testing.T) {
 	// cascade+llm: stage-0 grammar → LLM → classifier fallback, the wiring #320
 	// proposes. Hash embedder for the fallback so the classifier contribution is
 	// the deterministic floor and any lift is attributable to the model.
-	repCascade, err := Score(ctx, "cascade+llm (0.8B) + hash fallback",
+	repCascade, err := Score(ctx, "cascade+llm ("+model+") + hash fallback",
 		newBaselineRouter(t, router.NewHashEmbedder(1024), lr), f)
 	if err != nil {
 		t.Fatalf("Score cascade: %v", err)
@@ -96,7 +108,7 @@ func TestLLMRouterBaseline(t *testing.T) {
 	// either way. Kept so the question stays answered instead of being
 	// re-asked, and so internal/llm does NOT grow a chat_template_kwargs field
 	// for a problem that does not exist.
-	repNoThink, err := Score(ctx, "llm-only (0.8B, thinking off) [diagnostic]",
+	repNoThink, err := Score(ctx, "llm-only ("+model+", thinking off) [diagnostic]",
 		RouterFunc(func(ctx context.Context, u string, now time.Time) (router.Decision, error) {
 			d, ok, err := router.NewLLMRouter(&noThinkCompleter{base: base, http: &http.Client{Timeout: 60 * time.Second}}).Route(ctx, u, now)
 			if err != nil {

internal/router/eval/modelid.go

@@ -0,0 +1,51 @@
+package eval
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+// ModelID asks llama-server which model it has loaded, so a scoring run can
+// label itself. Without this a bake-off between two models produces two tables
+// that look identical, and the operator has to remember which server was up.
+//
+// Read from the server rather than passed in on purpose: a hand-typed label
+// goes stale the moment someone restarts the server with a different -m.
+func ModelID(ctx context.Context, base string) (string, error) {
+	req, err := http.NewRequestWithContext(ctx, "GET", strings.TrimSuffix(base, "/")+"/v1/models", nil)
+	if err != nil {
+		return "", err
+	}
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != 200 {
+		return "", fmt.Errorf("models: status %d", resp.StatusCode)
+	}
+	var out struct {
+		Data []struct {
+			ID string `json:"id"`
+		} `json:"data"`
+	}
+	if err := json.NewDecoder(resp.Body).Decode(&out); err != nil {
+		return "", err
+	}
+	if len(out.Data) == 0 {
+		return "", fmt.Errorf("models: empty list")
+	}
+	return shortModelID(out.Data[0].ID), nil
+}
+
+// shortModelID trims the path and the .gguf suffix — llama-server reports the
+// file name it was started with, which is too long for a table header.
+func shortModelID(id string) string {
+	if i := strings.LastIndexAny(id, "/\\"); i >= 0 {
+		id = id[i+1:]
+	}
+	return strings.TrimSuffix(id, ".gguf")
+}