diff --git a/AGENTS.md b/AGENTS.md
index cac369f..5bcc5e6 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -38,8 +38,8 @@ go test ./internal/domain/categorizer/... -v   # single package
 Reads `config.yaml` or env vars:
 - `MONARCH_TOKEN` — Monarch API token (required)
 - LLM categorizer — set **one** of:
-  - `OPENAI_API_KEY` (also `OPENAI_APIKEY`) with optional `OPENAI_MODEL` (default `gpt-5.4-nano`)
-  - `ANTHROPIC_API_KEY` (also `CLAUDE_API_KEY`) with optional `ANTHROPIC_MODEL` (default `claude-haiku-4-5-20251001`)
+  - `OPENAI_API_KEY` (also `OPENAI_APIKEY`) with optional `OPENAI_MODEL` (default `gpt-5.6-luna`)
+  - `ANTHROPIC_API_KEY` (also `CLAUDE_API_KEY`) with optional `ANTHROPIC_MODEL` (default `claude-haiku-4-5`)
 - `CATEGORIZER_PROVIDER` — `openai` or `anthropic` to force a backend when both keys are set (auto-detected otherwise)
 - SQLite DB auto-created at `monarch_sync.db`
 
diff --git a/README.md b/README.md
index 2a17520..11a8ec5 100644
--- a/README.md
+++ b/README.md
@@ -77,11 +77,11 @@ monarch:
 
 openai:
   api_key: "${OPENAI_API_KEY}"
-  model: "gpt-5.4-nano"
+  model: "gpt-5.6-luna"
 
 anthropic:
   api_key: "${ANTHROPIC_API_KEY}"
-  model: "claude-haiku-4-5-20251001"
+  model: "claude-haiku-4-5"
 
 # Optional: force a backend when both keys are set.
 # Leave blank to auto-detect from whichever key is present.
diff --git a/config.yaml b/config.yaml
index e8fc38b..e575e46 100644
--- a/config.yaml
+++ b/config.yaml
@@ -36,13 +36,13 @@ monarch:
 # OpenAI configuration
 openai:
   api_key: "${OPENAI_API_KEY}"
-  model: "gpt-5.4-nano"
+  model: "gpt-5.6-luna"
 
 # Anthropic (Claude) configuration — used when CATEGORIZER_PROVIDER=anthropic
 # or when ANTHROPIC_API_KEY is the only LLM key set.
 anthropic:
   api_key: "${ANTHROPIC_API_KEY}"
-  model: "claude-haiku-4-5-20251001"
+  model: "claude-haiku-4-5"
 
 # Categorizer backend selection.
 # Leave provider empty to auto-detect from which API key is set.
diff --git a/internal/adapters/clients/clients.go b/internal/adapters/clients/clients.go
index 9f1df0b..c5fb447 100644
--- a/internal/adapters/clients/clients.go
+++ b/internal/adapters/clients/clients.go
@@ -5,17 +5,17 @@ import (
 	"log/slog"
 	"strings"
 
-	"github.com/eshaffer321/monarch-go/v2/pkg/monarch"
 	anthropicclient "github.com/eshaffer321/itemize/internal/adapters/clients/anthropic"
 	openaiclient "github.com/eshaffer321/itemize/internal/adapters/clients/openai"
 	"github.com/eshaffer321/itemize/internal/domain/categorizer"
 	"github.com/eshaffer321/itemize/internal/infrastructure/config"
+	"github.com/eshaffer321/monarch-go/v2/pkg/monarch"
 )
 
 const (
 	providerOpenAI        = "openai"
 	providerAnthropic     = "anthropic"
-	defaultAnthropicModel = "claude-haiku-4-5-20251001"
+	defaultAnthropicModel = "claude-haiku-4-5"
 )
 
 type Clients struct {
diff --git a/internal/domain/categorizer/categorizer.go b/internal/domain/categorizer/categorizer.go
index cd10cd7..7be7283 100644
--- a/internal/domain/categorizer/categorizer.go
+++ b/internal/domain/categorizer/categorizer.go
@@ -96,7 +96,7 @@ func NewCategorizer(client ChatClient, cache Cache, model string) *Categorizer {
 	}
 }
 
-const DefaultModel = "gpt-5.4-nano"
+const DefaultModel = "gpt-5.6-luna"
 
 // CategorizeItems categorizes a list of items using available categories
 func (c *Categorizer) CategorizeItems(ctx context.Context, items []Item, categories []Category) (*CategorizationResult, error) {
diff --git a/internal/domain/categorizer/categorizer_test.go b/internal/domain/categorizer/categorizer_test.go
index b0104ce..bd6476f 100644
--- a/internal/domain/categorizer/categorizer_test.go
+++ b/internal/domain/categorizer/categorizer_test.go
@@ -423,5 +423,5 @@ func TestCategorizer_CategorizeItems_ExhaustsRetries(t *testing.T) {
 func TestNewCategorizer_DefaultsModelWhenEmpty(t *testing.T) {
 	categorizer := NewCategorizer(new(MockChatClient), new(MockCache), "")
 
-	assert.Equal(t, "gpt-5.4-nano", categorizer.Model)
+	assert.Equal(t, DefaultModel, categorizer.Model)
 }
diff --git a/internal/infrastructure/config/config.go b/internal/infrastructure/config/config.go
index 611cbb7..cd530a7 100644
--- a/internal/infrastructure/config/config.go
+++ b/internal/infrastructure/config/config.go
@@ -186,11 +186,11 @@ func LoadFromEnv() *Config {
 		},
 		OpenAI: OpenAIConfig{
 			APIKey: os.Getenv("OPENAI_API_KEY"),
-			Model:  getEnv("OPENAI_MODEL", "gpt-5.4-nano"),
+			Model:  getEnv("OPENAI_MODEL", "gpt-5.6-luna"),
 		},
 		Anthropic: AnthropicConfig{
 			APIKey: firstNonEmpty(os.Getenv("ANTHROPIC_API_KEY"), os.Getenv("CLAUDE_API_KEY")),
-			Model:  getEnv("ANTHROPIC_MODEL", "claude-haiku-4-5-20251001"),
+			Model:  getEnv("ANTHROPIC_MODEL", "claude-haiku-4-5"),
 		},
 		Categorizer: CategorizerConfig{
 			Provider: os.Getenv("CATEGORIZER_PROVIDER"),
diff --git a/internal/infrastructure/config/config_test.go b/internal/infrastructure/config/config_test.go
index 962e1ad..42c7d78 100644
--- a/internal/infrastructure/config/config_test.go
+++ b/internal/infrastructure/config/config_test.go
@@ -37,7 +37,7 @@ func TestLoadFromYAML(t *testing.T) {
 	require.NoError(t, err)
 	assert.NotNil(t, cfg)
 	assert.Equal(t, "monarch_sync.db", cfg.Storage.DatabasePath)
-	assert.Equal(t, "gpt-5.4-nano", cfg.OpenAI.Model)
+	assert.Equal(t, "gpt-5.6-luna", cfg.OpenAI.Model)
 }
 
 func TestLoadFromEnv(t *testing.T) {
@@ -66,7 +66,7 @@ func TestLoadFromEnv_Defaults(t *testing.T) {
 	cfg := LoadFromEnv()
 	assert.NotNil(t, cfg)
 	assert.Equal(t, "monarch_sync.db", cfg.Storage.DatabasePath)
-	assert.Equal(t, "gpt-5.4-nano", cfg.OpenAI.Model)
+	assert.Equal(t, "gpt-5.6-luna", cfg.OpenAI.Model)
 }
 
 func TestLoadOrEnv(t *testing.T) {