diff --git a/src/components/landing/InteractiveHeroAiPanel.tsx b/src/components/landing/InteractiveHeroAiPanel.tsx
index 3f288ed6..eb542938 100644
--- a/src/components/landing/InteractiveHeroAiPanel.tsx
+++ b/src/components/landing/InteractiveHeroAiPanel.tsx
@@ -10,7 +10,7 @@ import type { WorkspaceItem } from "#/features/workspaces/contracts";
 import { getWorkspaceItemDisplay } from "#/features/workspaces/model/item-display";
 import { cn } from "#/lib/utils";
 
-const MODELS = ["Auto", "GPT-5", "Claude Sonnet", "Gemini Pro"] as const;
+const MODELS = ["Auto", "GPT-6.1 Sol", "Claude Sonnet", "Gemini Pro"] as const;
 
 /** Lightweight AI chat simulation for the public workspace preview. */
 export function InteractiveHeroAiPanel({
diff --git a/src/components/landing/visuals/ModelsVisual.tsx b/src/components/landing/visuals/ModelsVisual.tsx
index 31ac42fa..6db4e738 100644
--- a/src/components/landing/visuals/ModelsVisual.tsx
+++ b/src/components/landing/visuals/ModelsVisual.tsx
@@ -20,7 +20,7 @@ const MODEL_GROUPS = WORKSPACE_AI_CHAT_PROVIDERS.map((provider) => ({
 })).filter((group) => group.models.length > 0);
 
 export function ModelsVisual() {
-	const [selectedModelId, setSelectedModelId] = useState<WorkspaceAiChatModelId>("gpt-terra");
+	const [selectedModelId, setSelectedModelId] = useState<WorkspaceAiChatModelId>("gpt-sol");
 	// Derived from the registry rather than restated, so a new provider or model
 	// shows up here without an edit. Hoisted out of render: it is constant.
 	const detailModel = getWorkspaceAiChatModelById(selectedModelId);
diff --git a/src/features/workspaces/ai/ai-gateway-routing.ts b/src/features/workspaces/ai/ai-gateway-routing.ts
index a7b72bd9..05fdd0d1 100644
--- a/src/features/workspaces/ai/ai-gateway-routing.ts
+++ b/src/features/workspaces/ai/ai-gateway-routing.ts
@@ -8,10 +8,10 @@ type GatewayRoutingOptions = {
 
 const GOOGLE_GATEWAY_PROVIDER_ORDER = ["google", "vertex"];
 // The native Anthropic route is the only one we want. Vertex has no Anthropic
-// quota in our GCP project (429 in ~200ms) and Bedrock has no Sonnet 5 access
-// (403), so both only ever landed on Vercel's own credits. Cross-model fallback
-// below covers a genuine Anthropic outage; add a provider back here if its
-// account-side access is ever granted.
+// quota in our GCP project (429 in ~200ms) and Bedrock has no current Sonnet
+// access (403), so both only ever landed on Vercel's own credits. Cross-model
+// fallback below covers a genuine Anthropic outage; add a provider back here if
+// its account-side access is ever granted.
 const CLAUDE_GATEWAY_PROVIDER_ORDER = ["anthropic"];
 // `only` is the gateway's sole exclusion primitive, and it is a hard filter over
 // the whole request — the fallback models below are unreachable unless their
@@ -29,33 +29,33 @@ const CLAUDE_GATEWAY_PROVIDER_ALLOWLIST = ["anthropic", "openai", "google"];
 const workspaceAiGatewayRouting: Record<WorkspaceAiChatModelId, GatewayRoutingOptions> = {
 	auto: {
 		order: ["openai", "azure"],
-		models: ["google/gemini-3-flash", "anthropic/claude-haiku-4.5"],
+		models: ["google/gemini-3.8-flash", "anthropic/claude-haiku-4.5"],
 	},
 	"claude-sonnet": {
 		only: CLAUDE_GATEWAY_PROVIDER_ALLOWLIST,
 		order: CLAUDE_GATEWAY_PROVIDER_ORDER,
-		models: ["openai/gpt-5.6-terra", "google/gemini-3.1-pro-preview"],
+		models: ["openai/gpt-6.1-sol", "google/gemini-3.1-pro-preview"],
 	},
 	"claude-haiku": {
 		only: CLAUDE_GATEWAY_PROVIDER_ALLOWLIST,
 		order: CLAUDE_GATEWAY_PROVIDER_ORDER,
-		models: ["openai/gpt-5.6-luna", "google/gemini-3-flash"],
+		models: ["openai/gpt-6-luna", "google/gemini-3.8-flash"],
 	},
-	"gpt-terra": {
+	"gpt-sol": {
 		order: ["openai", "azure"],
-		models: ["anthropic/claude-sonnet-5", "google/gemini-3.1-pro-preview"],
+		models: ["anthropic/claude-sonnet-5.5", "google/gemini-3.1-pro-preview"],
 	},
 	"gpt-luna": {
 		order: ["openai", "azure"],
-		models: ["google/gemini-3-flash", "anthropic/claude-haiku-4.5"],
+		models: ["google/gemini-3.8-flash", "anthropic/claude-haiku-4.5"],
 	},
 	"gemini-pro": {
 		order: GOOGLE_GATEWAY_PROVIDER_ORDER,
-		models: ["openai/gpt-5.6-terra", "anthropic/claude-sonnet-5"],
+		models: ["openai/gpt-6.1-sol", "anthropic/claude-sonnet-5.5"],
 	},
 	gemini: {
 		order: GOOGLE_GATEWAY_PROVIDER_ORDER,
-		models: ["openai/gpt-5.6-luna", "anthropic/claude-haiku-4.5"],
+		models: ["openai/gpt-6-luna", "anthropic/claude-haiku-4.5"],
 	},
 };
 
@@ -66,10 +66,8 @@ export function getWorkspaceAiGatewayRoutingOptions(modelId: WorkspaceAiChatMode
 export function getAIThreadTitleGatewayRoutingOptions() {
 	return {
 		order: GOOGLE_GATEWAY_PROVIDER_ORDER,
-		// Cross-provider backstop for the Google primary. gpt-4.1-nano was retired
-		// from ChatGPT and has an Azure end-of-life with no named successor, so
-		// track a current nano instead.
-		models: ["openai/gpt-5.4-nano"],
+		// Lightweight cross-provider backstop for title generation.
+		models: ["openai/gpt-6-luna"],
 	};
 }
 
@@ -78,6 +76,6 @@ export function getWorkspaceImageExtractionGatewayRoutingOptions() {
 		order: GOOGLE_GATEWAY_PROVIDER_ORDER,
 		// Cross-provider backstop so a Google outage still gets an image read.
 		// Both fallbacks accept image input; a text-only model would 400 the leg.
-		models: ["openai/gpt-5.6-luna", "anthropic/claude-haiku-4.5"],
+		models: ["openai/gpt-6-luna", "anthropic/claude-haiku-4.5"],
 	};
 }
diff --git a/src/features/workspaces/ai/chat/chat-telemetry.ts b/src/features/workspaces/ai/chat/chat-telemetry.ts
index 31834b0e..4cd66c9a 100644
--- a/src/features/workspaces/ai/chat/chat-telemetry.ts
+++ b/src/features/workspaces/ai/chat/chat-telemetry.ts
@@ -27,7 +27,7 @@ export interface AiChatGenerationTelemetry {
 	threadId: string;
 	/** The turn's stream id — one trace groups the turn and its utility calls. */
 	traceId: string;
-	/** The gateway model string, e.g. "anthropic/claude-sonnet-5". */
+	/** The gateway model string, e.g. "anthropic/claude-sonnet-5.5". */
 	gatewayModel: string;
 	/** The app-level model id the user picked, for the requested_model property. */
 	requestedModel?: string;
diff --git a/src/features/workspaces/ai/gateway.ts b/src/features/workspaces/ai/gateway.ts
index e1f0b739..b13c55b8 100644
--- a/src/features/workspaces/ai/gateway.ts
+++ b/src/features/workspaces/ai/gateway.ts
@@ -17,7 +17,7 @@ import {
 // has no framework dependencies; the comments carry over because the tuning
 // rationale is unchanged.
 
-export const AI_THREAD_TITLE_GATEWAY_MODEL = "google/gemini-2.5-flash-lite";
+export const AI_THREAD_TITLE_GATEWAY_MODEL = "google/gemini-3.5-flash-lite";
 
 type WorkspaceAiProviderOptions = NonNullable<
 	Parameters<typeof generateText>[0]["providerOptions"]
@@ -52,7 +52,7 @@ export function getWorkspaceAiGatewayTransportOptions() {
 		// Buy the fast lane where it exists. The gateway only forwards a tier to
 		// OpenAI, Google AI Studio, and Vertex, so this is a no-op on the Claude
 		// primaries and moves the models we actually default to (`auto`/luna, the
-		// Gemini pair, the nano/flash-lite title legs). It is a hint, never a
+		// Gemini pair, the luna/flash-lite title legs). It is a hint, never a
 		// promise: an unsupported model ignores it, and a provider that is out of
 		// priority capacity silently downgrades to standard and bills standard.
 		serviceTier: "priority" as const,
@@ -109,9 +109,9 @@ export function getAIThreadTitleGatewayProviderOptions(): WorkspaceAiProviderOpt
 				`model:${AI_THREAD_TITLE_GATEWAY_MODEL}`,
 			],
 		},
-		// The 2.5-series title model rejects `thinkingLevel`; budget is its knob.
-		google: { thinkingConfig: { thinkingBudget: 0 } },
-		vertex: { thinkingConfig: { thinkingBudget: 0 } },
+		// Keep title generation at the lowest supported thinking level.
+		google: { thinkingConfig: { thinkingLevel: "minimal" } },
+		vertex: { thinkingConfig: { thinkingLevel: "minimal" } },
 		openai: { reasoningEffort: "none" },
 	};
 }
@@ -129,10 +129,11 @@ function getWorkspaceAiReasoningOptions(
 					thinkingConfig: { thinkingLevel: "low" },
 				},
 			};
-		case "gpt-terra":
+		case "gpt-sol":
 			return {
 				openai: {
-					reasoningEffort: "none",
+					// Sol 6.1 requires reasoning; low is its minimum supported effort.
+					reasoningEffort: "low",
 				},
 			};
 		default:
diff --git a/src/features/workspaces/ai/models.ts b/src/features/workspaces/ai/models.ts
index 6c15050d..49c4f06f 100644
--- a/src/features/workspaces/ai/models.ts
+++ b/src/features/workspaces/ai/models.ts
@@ -25,7 +25,8 @@ export type WorkspaceAiChatModelBillingTier = "standard" | "premium";
 // across input, cached input, and output rather than output alone — output
 // price by itself understates the models we send the most tokens to.
 //
-// Measured 1.0x / 2.5x / 4.7x / 9.5x / 10x, rounded to a clean ladder so these
+// Standard-rate estimates: Luna 1x, Flash 7.5x, Haiku 10x, Sol 18.9x,
+// Sonnet 20x, and Pro 21.2x, rounded to whole multipliers so these
 // double as credit weights if usage is ever metered. Re-derive from the gateway
 // catalog when the lineup changes; a stale multiplier misprices the plan.
 //
@@ -38,7 +39,7 @@ export const WORKSPACE_AI_CHAT_MODELS = [
 		name: "Auto",
 		// Keep this a stable product choice while the server owns its availability
 		// policy and fallback chain.
-		gatewayModel: "openai/gpt-5.6-luna",
+		gatewayModel: "openai/gpt-6-luna",
 		provider: "auto",
 		tagline: "Fast and capable by default",
 		description:
@@ -48,12 +49,12 @@ export const WORKSPACE_AI_CHAT_MODELS = [
 		speed: 3,
 		cost: 1,
 		billingTier: "standard",
-		contextWindow: 1_000_000,
+		contextWindow: 1_050_000,
 	},
 	{
 		id: "claude-sonnet",
-		name: "Claude Sonnet 5",
-		gatewayModel: "anthropic/claude-sonnet-5",
+		name: "Claude Sonnet 5.5",
+		gatewayModel: "anthropic/claude-sonnet-5.5",
 		provider: "anthropic",
 		tagline: "Thoughtful and polished",
 		description:
@@ -61,7 +62,7 @@ export const WORKSPACE_AI_CHAT_MODELS = [
 		bestFor: "Writing, analysis & coding",
 		intelligence: 4,
 		speed: 3,
-		cost: 10,
+		cost: 20,
 		billingTier: "premium",
 		contextWindow: 1_000_000,
 	},
@@ -75,14 +76,14 @@ export const WORKSPACE_AI_CHAT_MODELS = [
 		bestFor: "Quick help & short drafts",
 		intelligence: 2,
 		speed: 4,
-		cost: 5,
+		cost: 10,
 		billingTier: "standard",
 		contextWindow: 200_000,
 	},
 	{
-		id: "gpt-terra",
-		name: "GPT-5.6 Terra",
-		gatewayModel: "openai/gpt-5.6-terra",
+		id: "gpt-sol",
+		name: "GPT-6.1 Sol",
+		gatewayModel: "openai/gpt-6.1-sol",
 		provider: "openai",
 		tagline: "Strong on harder tasks",
 		description:
@@ -90,14 +91,14 @@ export const WORKSPACE_AI_CHAT_MODELS = [
 		bestFor: "Planning, research & knowledge work",
 		intelligence: 4,
 		speed: 3,
-		cost: 10,
+		cost: 19,
 		billingTier: "premium",
-		contextWindow: 1_000_000,
+		contextWindow: 1_050_000,
 	},
 	{
 		id: "gpt-luna",
-		name: "GPT-5.6 Luna",
-		gatewayModel: "openai/gpt-5.6-luna",
+		name: "GPT-6 Luna",
+		gatewayModel: "openai/gpt-6-luna",
 		provider: "openai",
 		tagline: "Quick and capable",
 		description: "A faster GPT for quick help, everyday questions, and practical tasks.",
@@ -106,7 +107,7 @@ export const WORKSPACE_AI_CHAT_MODELS = [
 		speed: 4,
 		cost: 1,
 		billingTier: "standard",
-		contextWindow: 1_000_000,
+		contextWindow: 1_050_000,
 	},
 	{
 		id: "gemini-pro",
@@ -119,14 +120,14 @@ export const WORKSPACE_AI_CHAT_MODELS = [
 		bestFor: "Long docs, research & hard problems",
 		intelligence: 4,
 		speed: 2,
-		cost: 10,
+		cost: 21,
 		billingTier: "premium",
 		contextWindow: 1_000_000,
 	},
 	{
 		id: "gemini",
-		name: "Gemini 3 Flash",
-		gatewayModel: "google/gemini-3-flash",
+		name: "Gemini 3.8 Flash",
+		gatewayModel: "google/gemini-3.8-flash",
 		provider: "google",
 		tagline: "Fast and wide-ranging",
 		description:
@@ -134,7 +135,7 @@ export const WORKSPACE_AI_CHAT_MODELS = [
 		bestFor: "Fast answers & big context",
 		intelligence: 3,
 		speed: 4,
-		cost: 3,
+		cost: 8,
 		billingTier: "standard",
 		contextWindow: 1_000_000,
 	},
diff --git a/src/features/workspaces/extraction/providers/gemini-image-markdown.ts b/src/features/workspaces/extraction/providers/gemini-image-markdown.ts
index d6992b32..1d70620e 100644
--- a/src/features/workspaces/extraction/providers/gemini-image-markdown.ts
+++ b/src/features/workspaces/extraction/providers/gemini-image-markdown.ts
@@ -13,7 +13,7 @@ import type {
 	MarkdownExtractionResult,
 } from "#/features/workspaces/extraction/types";
 
-const IMAGE_EXTRACTION_GATEWAY_MODEL = "google/gemini-2.5-flash";
+const IMAGE_EXTRACTION_GATEWAY_MODEL = "google/gemini-3.8-flash";
 const jpegMediaType = "image/jpeg";
 
 // Transcription, not interpretation: the markdown feeds search and chat context,
@@ -50,14 +50,12 @@ export function createGeminiImageMarkdownProvider(env: Env): MarkdownExtractionP
 							`model:${IMAGE_EXTRACTION_GATEWAY_MODEL}`,
 						],
 					},
-					// The 2.5-series rejects `thinkingLevel` outright, which 400s every
-					// Google leg; budget is its knob. Reading what is on the page needs
-					// no reasoning, and the fallbacks bill for it if it is left on.
+					// Minimize reasoning for transcription and its fallback models.
 					google: {
-						thinkingConfig: { thinkingBudget: 0 },
+						thinkingConfig: { thinkingLevel: "low" },
 					},
 					vertex: {
-						thinkingConfig: { thinkingBudget: 0 },
+						thinkingConfig: { thinkingLevel: "low" },
 					},
 					openai: {
 						reasoningEffort: "none",
diff --git a/src/integrations/autumn/workspace-ai-access.test.ts b/src/integrations/autumn/workspace-ai-access.test.ts
index 0f8b83e8..f529bd39 100644
--- a/src/integrations/autumn/workspace-ai-access.test.ts
+++ b/src/integrations/autumn/workspace-ai-access.test.ts
@@ -23,7 +23,7 @@ describe("resolveWorkspaceAiMessageAccess", () => {
 	});
 
 	it("falls back to auto when premium is spent but standard remains", () => {
-		for (const chosenModelId of ["claude-sonnet", "gpt-terra", "gemini-pro"] as const) {
+		for (const chosenModelId of ["claude-sonnet", "gpt-sol", "gemini-pro"] as const) {
 			expect(
 				resolveWorkspaceAiMessageAccess({
 					chosenModelId,
@@ -99,7 +99,7 @@ describe("resolveWorkspaceAiMessageAccess", () => {
 // quietly becoming the priciest model in the tier it lands on.
 describe("fallback pricing", () => {
 	it("lands on the cheapest model in the tier it falls back to", () => {
-		for (const chosenModelId of ["claude-sonnet", "gpt-terra", "gemini-pro"] as const) {
+		for (const chosenModelId of ["claude-sonnet", "gpt-sol", "gemini-pro"] as const) {
 			const access = resolveWorkspaceAiMessageAccess({
 				chosenModelId,
 				chosenTierAllowed: false,
diff --git a/src/integrations/posthog/ai-observability.worker.test.ts b/src/integrations/posthog/ai-observability.worker.test.ts
index bd4bd543..fcec852c 100644
--- a/src/integrations/posthog/ai-observability.worker.test.ts
+++ b/src/integrations/posthog/ai-observability.worker.test.ts
@@ -93,7 +93,7 @@ describe("getGatewayServedRoute", () => {
 				routing: {
 					finalProvider: "openai",
 					modelAttempts: [
-						{ canonicalSlug: "anthropic/claude-sonnet-5", success: false, providerAttempts: [] },
+						{ canonicalSlug: "anthropic/claude-sonnet-5.5", success: false, providerAttempts: [] },
 						{
 							canonicalSlug: "openai/gpt-5.6-terra",
 							success: true,