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feat(site): add claude-fable-5 and claude-mythos-5 known model defaults #27131

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Merged
ThomasK33 merged 1 commit into from
Jul 9, 2026
Merged

feat(site): add claude-fable-5 and claude-mythos-5 known model defaults #27131

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6 changes: 6 additions & 0 deletions site/src/pages/AgentsPage/components/ChatModelAdminPanel/knownModels/anthropic.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,8 @@ describe("anthropicKnownModels", () => {
(knownModel) => knownModel.modelIdentifier,
),
).toEqual([
"claude-fable-5",
"claude-mythos-5",
"claude-opus-4-8",
"claude-opus-4-7",
"claude-opus-4-6",
Expand All @@ -33,6 +35,8 @@ describe("anthropicKnownModels", () => {

it("declares Anthropic reasoning defaults by API support", () => {
for (const modelIdentifier of [
"claude-fable-5",
"claude-mythos-5",
"claude-opus-4-8",
"claude-opus-4-7",
"claude-opus-4-6",
Expand All @@ -59,6 +63,8 @@ describe("anthropicKnownModels", () => {
expect(
anthropicKnownModels.map((knownModel) => knownModel.modelIdentifier),
).toEqual([
"claude-fable-5",
"claude-mythos-5",
"claude-opus-4-8",
"claude-opus-4-7",
"claude-opus-4-6",
Expand Down
43 changes: 41 additions & 2 deletions site/src/pages/AgentsPage/components/ChatModelAdminPanel/knownModels/anthropic.ts
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Expand Up @@ -10,15 +10,54 @@ import type { KnownModel } from "./types";
// catalog and should be reviewed when the catalog is refreshed.
//
// Reasoning configuration is split per model based on Anthropic API support:
// models that support adaptive thinking (Opus 4.8, Opus 4.7, Opus 4.6,
// Sonnet 4.6) carry `reasoningEffort`, which Coder maps to
// models that support adaptive thinking (Fable 5, Mythos 5, Opus 4.8,
// Opus 4.7, Opus 4.6, Sonnet 4.6) carry `reasoningEffort`, which Coder maps to
// `thinking.type: "adaptive"` with the `effort` parameter. Models that do not
// (Haiku 4.5, Sonnet 4.5)
// carry `thinkingBudgetTokens` instead, which Coder maps to the legacy
// `thinking.type: "enabled"` path with `budget_tokens`. Setting `effort` on
// the legacy path produces an "adaptive thinking is not supported on this
// model" HTTP 400 from Anthropic.
export const anthropicKnownModels = [
{
provider: "anthropic",
modelIdentifier: "claude-fable-5",
displayName: "Claude Fable 5",
aliases: [],
contextLimit: 1_000_000,
maxOutputTokens: 128_000,
reasoningEffort: "high",
inputCost: 10,
outputCost: 50,
cacheReadCost: 1,
cacheWriteCost: 12.5,
sourceMetadata: {
sourceName: "models.dev",
sourceRetrievedAt: "2026-07-09",
lastUpdated: "2026-06-09",
},
},
// models.dev does not list claude-mythos-5. Anthropic documents that
// Mythos 5 shares Fable 5's specs and pricing, so this entry mirrors
// the claude-fable-5 models.dev entry.
{
provider: "anthropic",
modelIdentifier: "claude-mythos-5",
displayName: "Claude Mythos 5",
aliases: [],
contextLimit: 1_000_000,
maxOutputTokens: 128_000,
reasoningEffort: "high",
inputCost: 10,
outputCost: 50,
cacheReadCost: 1,
cacheWriteCost: 12.5,
sourceMetadata: {
sourceName: "models.dev",
sourceRetrievedAt: "2026-07-09",
lastUpdated: "2026-06-09",
},
},
{
provider: "anthropic",
modelIdentifier: "claude-opus-4-8",
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