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feat(shared,host-service): add Claude Fable 5.1 to the model pickers and pricing table #7099

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Merged
AviPeltz merged 2 commits into from
Sep 2, 2026
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feat(shared,host-service): add Claude Fable 5.1 to the model pickers and pricing table #7099

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e526a1d
feat(shared,host-service): add Claude Fable 5.1 to the model pickers …
AviPeltz Sep 2, 2026
b478ccd
fix(host-service,shared): correct Sonnet 5 and GPT-5.6 Sol rates, pri…
AviPeltz Sep 2, 2026
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39 changes: 36 additions & 3 deletions packages/host-service/src/trpc/router/usage/history/pricing.test.ts
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Original file line number Diff line number Diff line change
@@ -1,12 +1,12 @@
import { describe, expect, test } from "bun:test";
import { matchModelRate } from "./pricing";
import { cacheSavingsUsd, costUsd, matchModelRate } from "./pricing";

describe("matchModelRate", () => {
test("matches vendor-qualified ids from multi-model harnesses", () => {
const rate = matchModelRate("opencode", "anthropic/claude-sonnet-5");
expect(rate.approximate).toBe(false);
expect(rate.inputPerM).toBe(3);
expect(rate.outputPerM).toBe(15);
expect(rate.inputPerM).toBe(2);
expect(rate.outputPerM).toBe(10);
});

test("unknown models fall back to the cheapest rate, marked approximate", () => {
Expand All @@ -20,6 +20,39 @@ describe("matchModelRate", () => {
expect(rate.inputPerM).toBe(2);
});

test("prices Fable 5.1 and Mythos 5.1 cache reads at their own rate, not the usual 0.1x", () => {
const fable51 = matchModelRate("claude", "claude-fable-5-1");
const fable5 = matchModelRate("claude", "claude-fable-5");
expect(fable51).toMatchObject({
inputPerM: 10,
outputPerM: 50,
cacheReadPerM: 0.25,
approximate: false,
});
expect(matchModelRate("claude", "claude-mythos-5-1")).toMatchObject({
cacheReadPerM: 0.25,
approximate: false,
});
expect(matchModelRate("omp", "anthropic/claude-fable-5-1")).toMatchObject({
cacheReadPerM: 0.25,
approximate: false,
});
const cachedMillion = {
uncachedInput: 0,
cachedInput: 1_000_000,
cacheWrite5m: 0,
cacheWrite1h: 0,
output: 0,
};
expect(costUsd(fable51, cachedMillion)).toBeCloseTo(0.25);
expect(costUsd(fable5, cachedMillion)).toBeCloseTo(1);
expect(
costUsd(matchModelRate("claude", "claude-mythos-5"), cachedMillion),
).toBeCloseTo(1);
expect(cacheSavingsUsd(fable51, cachedMillion)).toBeCloseTo(9.75);
expect(cacheSavingsUsd(fable5, cachedMillion)).toBeCloseTo(9);
});

test("uses Gemini Pro long-context tiers above 200k prompt tokens", () => {
expect(matchModelRate("agy", "gemini-3.1-pro", 200_000)).toMatchObject({
inputPerM: 2,
Expand Down
32 changes: 24 additions & 8 deletions packages/host-service/src/trpc/router/usage/history/pricing.ts
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Expand Up @@ -8,11 +8,16 @@ import type { UsageAgent } from "../types";
* Longest-prefix match on the lowercased model id; unknown models fall back
* to the agent's cheapest rate and mark the result approximate.
*/
export const PRICING_TABLE_UPDATED = "2026-08-16";
export const PRICING_TABLE_UPDATED = "2026-09-01";

@cubic-dev-ai cubic-dev-ai Bot Sep 2, 2026

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P3: The API reports the pricing table as updated on September 1 even though this revision re-read the rows on September 2. Set the metadata date to 2026-09-02 so consumers do not display a stale update date.

Prompt for AI agents 
Check if this issue is valid — if so, understand the root cause and fix it. At packages/host-service/src/trpc/router/usage/history/pricing.ts, line 11:

<comment>The API reports the pricing table as updated on September 1 even though this revision re-read the rows on September 2. Set the metadata date to `2026-09-02` so consumers do not display a stale update date.</comment>

<file context>
@@ -8,11 +8,16 @@ import type { UsageAgent } from "../types";
  * to the agent's cheapest rate and mark the result approximate.
  */
-export const PRICING_TABLE_UPDATED = "2026-08-16";
+export const PRICING_TABLE_UPDATED = "2026-09-01";
 
 export interface ModelRate {
</file context>
Suggested change
export const PRICING_TABLE_UPDATED = "2026-09-01";
export const PRICING_TABLE_UPDATED = "2026-09-02";


export interface ModelRate {
inputPerM: number;
outputPerM: number;
/**
* Cache-read price in USD per million tokens, for models priced off the
* usual `CACHE_READ_MULTIPLIER` share of input.
*/
cacheReadPerM?: number;
longContext?: ModelRate;
}

Expand All @@ -22,6 +27,10 @@ export const CACHE_WRITE_5M_MULTIPLIER = 1.25;
export const CACHE_WRITE_1H_MULTIPLIER = 2;

const CLAUDE_RATES: Record<string, ModelRate> = {
// Fable 5.1 and Mythos 5.1 keep Fable 5's token price but cut cache reads
// to $0.25/M (0.025x input) instead of the usual 0.1x.
"claude-fable-5-1": { inputPerM: 10, outputPerM: 50, cacheReadPerM: 0.25 },
"claude-mythos-5-1": { inputPerM: 10, outputPerM: 50, cacheReadPerM: 0.25 },
"claude-fable-5": { inputPerM: 10, outputPerM: 50 },
"claude-mythos": { inputPerM: 10, outputPerM: 50 },
"claude-opus-5": { inputPerM: 5, outputPerM: 25 },
Expand All @@ -31,17 +40,21 @@ const CLAUDE_RATES: Record<string, ModelRate> = {
"claude-opus-4-5": { inputPerM: 5, outputPerM: 25 },
// Opus 4.0/4.1 predate the price cut.
"claude-opus-4": { inputPerM: 15, outputPerM: 75 },
"claude-sonnet-5": { inputPerM: 3, outputPerM: 15 },
// Sonnet 5's launch price is permanent: the $3/$15 increase scheduled for
// 2026-09-01 was cancelled.
"claude-sonnet-5": { inputPerM: 2, outputPerM: 10 },
"claude-sonnet-4": { inputPerM: 3, outputPerM: 15 },
"claude-haiku-4-5": { inputPerM: 1, outputPerM: 5 },
"claude-3-5-haiku": { inputPerM: 0.8, outputPerM: 4 },
};

const CODEX_RATES: Record<string, ModelRate> = {
"gpt-5.6-sol": { inputPerM: 5, outputPerM: 30 },
// Sol's promotional price, published as lasting at least through
// 2026-11-21; the bare `gpt-5.6` id follows Sol.
"gpt-5.6-sol": { inputPerM: 4, outputPerM: 20 },
"gpt-5.6-terra": { inputPerM: 2, outputPerM: 12 },
"gpt-5.6-luna": { inputPerM: 0.2, outputPerM: 1.2 },
"gpt-5.6": { inputPerM: 5, outputPerM: 30 },
"gpt-5.6": { inputPerM: 4, outputPerM: 20 },
"gpt-5.3-codex": { inputPerM: 1.75, outputPerM: 14 },
"gpt-5.3": { inputPerM: 1.75, outputPerM: 14 },
"gpt-5-codex": { inputPerM: 1.25, outputPerM: 10 },
Expand Down Expand Up @@ -172,19 +185,22 @@ export interface TokenCounts {
output: number;
}

/** The model's own cache-read price, else the usual share of its input rate. */
function cacheReadPerM(rate: ModelRate): number {
return rate.cacheReadPerM ?? rate.inputPerM * CACHE_READ_MULTIPLIER;
}

export function costUsd(rate: ModelRate, tokens: TokenCounts): number {
return (
(tokens.uncachedInput / 1e6) * rate.inputPerM +
(tokens.output / 1e6) * rate.outputPerM +
(tokens.cachedInput / 1e6) * rate.inputPerM * CACHE_READ_MULTIPLIER +
(tokens.cachedInput / 1e6) * cacheReadPerM(rate) +
(tokens.cacheWrite5m / 1e6) * rate.inputPerM * CACHE_WRITE_5M_MULTIPLIER +
(tokens.cacheWrite1h / 1e6) * rate.inputPerM * CACHE_WRITE_1H_MULTIPLIER
);
}

/** Dollars saved by cache reads vs paying full input price for them. */
export function cacheSavingsUsd(rate: ModelRate, tokens: TokenCounts): number {
return (
(tokens.cachedInput / 1e6) * rate.inputPerM * (1 - CACHE_READ_MULTIPLIER)
);
return (tokens.cachedInput / 1e6) * (rate.inputPerM - cacheReadPerM(rate));
}
17 changes: 16 additions & 1 deletion packages/shared/src/agent-models.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -52,9 +52,10 @@ describe("AGENT_MODEL_SUPPORT", () => {
});

describe("SUPERSET_CHAT_MODELS", () => {
it("includes opus 5 and the GPT-5.6 Codex models", () => {
it("includes opus 5, fable 5.1 and the GPT-5.6 Codex models", () => {
const ids = SUPERSET_CHAT_MODELS.map((model) => model.id);
expect(ids).toContain("anthropic/claude-opus-5");
expect(ids).toContain("anthropic/claude-fable-5-1");
expect(ids).toContain("openai/gpt-5.6-sol");
expect(ids).toContain("openai/gpt-5.6-terra");
expect(ids).toContain("openai/gpt-5.6-luna");
Expand Down Expand Up @@ -112,6 +113,7 @@ describe("buildAgentModelArgs", () => {
// Aliases follow the CLI's newest model; teams standardising on one
// release need an id that stays put.
expect(ids).toContain("opus");
expect(ids).toContain("claude-fable-5-1");
expect(ids).toContain("claude-opus-4-8");
expect(ids).toContain("claude-opus-4-7");
expect(ids).toContain("claude-sonnet-4-6");
Expand All @@ -124,6 +126,7 @@ describe("buildAgentModelArgs", () => {
models.find((model) => model.id === id)?.group;
expect(groupOf("opus")).toBe("Latest");
expect(groupOf("claude-opus-4-8")).toBe("Pinned releases");
expect(groupOf("claude-fable-5-1")).toBe("Pinned releases");
// The header carries the distinction, so labels stay bare.
expect(models.find((model) => model.id === "opus")?.label).toBe("Opus");
});
Expand Down Expand Up @@ -167,6 +170,18 @@ describe("buildAgentModelArgs", () => {
);
});

it("includes fable 5.1 as a pinned claude release and for the models.dev harnesses", () => {
expect(buildAgentModelArgs("claude", "claude-fable-5-1")).toEqual([
"--model",
"claude-fable-5-1",
]);
for (const preset of ["opencode", "omp"]) {
expect(buildAgentModelArgs(preset, "anthropic/claude-fable-5-1")).toEqual(
["--model", "anthropic/claude-fable-5-1"],
);
}
});

it("includes every GPT-5.6 Codex model", () => {
for (const model of ["gpt-5.6-sol", "gpt-5.6-terra", "gpt-5.6-luna"]) {
expect(buildAgentModelArgs("codex", model)).toEqual(["--model", model]);
Expand Down
14 changes: 12 additions & 2 deletions packages/shared/src/agent-models.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,11 @@ export const SUPERSET_CHAT_MODELS: readonly SupersetChatModel[] = [
{ id: "anthropic/claude-opus-5", label: "Opus 5", provider: "Anthropic" },
{ id: "anthropic/claude-opus-4-8", label: "Opus 4.8", provider: "Anthropic" },
{ id: "anthropic/claude-opus-4-7", label: "Opus 4.7", provider: "Anthropic" },
{
id: "anthropic/claude-fable-5-1",
label: "Fable 5.1",
provider: "Anthropic",
},
{ id: "anthropic/claude-fable-5", label: "Fable 5", provider: "Anthropic" },
{
id: "anthropic/claude-sonnet-4-6",
Expand Down Expand Up @@ -89,6 +94,7 @@ export const AGENT_MODEL_SUPPORT: readonly AgentModelSupport[] = [
{ id: "opus", label: "Opus", group: LATEST_GROUP },
{ id: "sonnet", label: "Sonnet", group: LATEST_GROUP },
{ id: "haiku", label: "Haiku", group: LATEST_GROUP },
{ id: "claude-fable-5-1", label: "Fable 5.1", group: PINNED_GROUP },
{ id: "claude-fable-5", label: "Fable 5", group: PINNED_GROUP },
{ id: "claude-opus-5", label: "Opus 5", group: PINNED_GROUP },
{ id: "claude-sonnet-5", label: "Sonnet 5", group: PINNED_GROUP },
Expand Down Expand Up @@ -166,8 +172,10 @@ export const AGENT_MODEL_SUPPORT: readonly AgentModelSupport[] = [
// openai ids verified against `opencode models` (2026-08-05), which
// no longer lists the old `openai/gpt-5`. anthropic ids follow the
// same models.dev catalog but need an authed anthropic provider to
// appear in that listing.
// appear in that listing; `claude-fable-5-1` was checked against
// models.dev directly (2026-09-01).
{ id: "anthropic/claude-opus-5", label: "Claude Opus 5" },
{ id: "anthropic/claude-fable-5-1", label: "Claude Fable 5.1" },
{ id: "anthropic/claude-fable-5", label: "Claude Fable 5" },
{ id: "anthropic/claude-sonnet-4-5", label: "Claude Sonnet 4.5" },
{ id: "openai/gpt-5.6-sol", label: "GPT-5.6 Sol" },
Expand All @@ -181,11 +189,13 @@ export const AGENT_MODEL_SUPPORT: readonly AgentModelSupport[] = [
models: [
// OMP accepts configured role aliases as well as exact
// provider/model selectors. Exact ids verified against
// `omp models --json` in OMP 18.0.1.
// `omp models --json` in OMP 18.0.1; `claude-fable-5-1` against the
// catalog bundled in OMP 18.1.2.
{ id: "@smol", label: "Configured fast model" },
{ id: "@slow", label: "Configured slow model" },
{ id: "@plan", label: "Configured plan model" },
{ id: "anthropic/claude-opus-5", label: "Claude Opus 5" },
{ id: "anthropic/claude-fable-5-1", label: "Claude Fable 5.1" },
{ id: "anthropic/claude-fable-5", label: "Claude Fable 5" },
{
id: "anthropic/claude-sonnet-4-6",
Expand Down
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