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feat(claude): add Mythos 5.1 with its model capabilities

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This commit is contained in:
Mohamed Boudra
2026-10-08 19:31:04 +02:00
parent d0bc188a5b
commit 593e844392
4 changed files with 75 additions and 4 deletions
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packages/cli/tests/15-provider.test.ts
+5
View File
@@ -62,6 +62,11 @@ const EXPECTED_CLAUDE_MODELS = [
model: "Opus 5",
descriptionFragment: "Previous release",
},
{
id: "claude-mythos-5-1",
model: "Mythos 5.1",
descriptionFragment: "Requires verified access",
},
{
id: "claude-fable-5-1",
model: "Fable 5.1",
packages/server/src/server/agent/providers/claude/agent.test.ts
+10
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@@ -438,6 +438,7 @@ describe("ClaudeAgentClient.fetchCatalog", () => {
expect(models.map((m) => m.id)).toEqual([
"claude-opus-5",
"claude-mythos-5-1",
"claude-fable-5-1",
"claude-fable-5",
"claude-fable-5[1m]",
@@ -509,6 +510,14 @@ describe("ClaudeAgentClient.fetchCatalog", () => {
};
expect(getThinkingIds("claude-opus-5")).toContain("ultracode");
expect(getThinkingIds("claude-mythos-5-1")).toEqual([
"low",
"medium",
"high",
"xhigh",
"max",
"ultracode",
]);
expect(getThinkingIds("claude-fable-5-1")).toContain("ultracode");
expect(getThinkingIds("claude-fable-5")).toContain("ultracode");
expect(getThinkingIds("claude-opus-4-8[1m]")).toContain("ultracode");
@@ -1232,6 +1241,7 @@ describe("ClaudeAgentSession features", () => {
test.each([
["supported model", "claude-opus-4-8", { type: "disabled" }, undefined],
["Mythos 5.1", "claude-mythos-5-1", { type: "adaptive", display: "summarized" }, "high"],
["Haiku 5.5", "claude-haiku-5-5", { type: "disabled" }, undefined],
["unsupported model", "claude-fable-5", { type: "adaptive", display: "summarized" }, "high"],
["custom model", "openrouter/anthropic/claude-opus-4-8", undefined, undefined],
packages/server/src/server/agent/providers/claude/model-manifest.ts
+11 -4
View File
@@ -57,6 +57,13 @@ export const CLAUDE_MODEL_MANIFEST = [
supportsThinkingDisabled: true,
supportsFastMode: true,
},
{
id: "claude-mythos-5-1",
label: "Mythos 5.1",
description: "Mythos 5.1 · Requires verified access",
contextWindowMaxTokens: 1_000_000,
effortLevels: CLAUDE_EFFORT_LEVELS.xhigh,
},
{
id: "claude-fable-5-1",
label: "Fable 5.1",
@@ -359,7 +366,7 @@ export function normalizeClaudeManifestModelId(value: string | null | undefined)
}
const singleSegmentMatch = trimmed.match(
/^(?:claude[-_ ])?(fable|opus|sonnet|haiku)[-_ ]+(\d+)(?:\[1m\])?(?:[-_ ]+\d{8})?(?:\[1m\])?$/i,
/^(?:claude[-_ ])?(mythos|fable|opus|sonnet|haiku)[-_ ]+(\d+)(?:\[1m\])?(?:[-_ ]+\d{8})?(?:\[1m\])?$/i,
);
if (singleSegmentMatch) {
return normalizeSingleSegmentClaudeModelId(
@@ -370,7 +377,7 @@ export function normalizeClaudeManifestModelId(value: string | null | undefined)
}
const runtimeMatch = trimmed.match(
/^(?:claude[-_ ])?(fable|opus|sonnet|haiku)[-_ ]+(\d+)[-.](\d+)(?:\[1m\])?(?:[-_ ]+\d{8})?(?:\[1m\])?$/i,
/^(?:claude[-_ ])?(mythos|fable|opus|sonnet|haiku)[-_ ]+(\d+)[-.](\d+)(?:\[1m\])?(?:[-_ ]+\d{8})?(?:\[1m\])?$/i,
);
if (!runtimeMatch) {
return null;
@@ -403,7 +410,7 @@ export function normalizeClaudeRuntimeModelId(value: string | null | undefined):
}
const runtimeMatch = trimmed.match(
/claude[-_ ](fable|opus|sonnet|haiku)[-_ ]+(\d+)[-.](\d+)(\[1m\])?/i,
/claude[-_ ](mythos|fable|opus|sonnet|haiku)[-_ ]+(\d+)[-.](\d+)(\[1m\])?/i,
);
if (runtimeMatch) {
const normalizedModelId = normalizeMajorMinorClaudeModelId(
@@ -418,7 +425,7 @@ export function normalizeClaudeRuntimeModelId(value: string | null | undefined):
}
const singleSegmentMatch = trimmed.match(
/claude[-_ ](fable|opus|sonnet|haiku)[-_ ]+(\d+)(\[1m\])?/i,
/claude[-_ ](mythos|fable|opus|sonnet|haiku)[-_ ]+(\d+)(\[1m\])?/i,
);
if (!singleSegmentMatch) {
return null;
packages/server/src/server/agent/providers/claude/models.test.ts
+49
View File
@@ -52,6 +52,7 @@ describe("getClaudeModels", () => {
expect(models.map((m) => m.id)).toEqual([
"claude-opus-5-5",
"claude-opus-5",
"claude-mythos-5-1",
"claude-fable-5-1",
"claude-fable-5",
"claude-fable-5[1m]",
@@ -87,6 +88,7 @@ describe("getClaudeModels", () => {
new Map([
["claude-opus-5-5", 1_000_000],
["claude-opus-5", 1_000_000],
["claude-mythos-5-1", 1_000_000],
["claude-fable-5-1", 1_000_000],
["claude-fable-5", 1_000_000],
["claude-fable-5[1m]", 1_000_000],
@@ -724,3 +726,50 @@ describe("claudeManifestModelSupportsFastMode", () => {
expect(claudeManifestModelSupportsFastMode("claude-fable-5-1")).toBe(false);
});
});
describe("Claude Mythos 5.1 catalog", () => {
it("offers one 1M model with high default effort and always-on thinking", () => {
const models = getClaudeModels().filter((model) => model.id.startsWith("claude-mythos"));
expect(models).toHaveLength(1);
expect(models[0]).toMatchObject({
id: "claude-mythos-5-1",
label: "Mythos 5.1",
contextWindowMaxTokens: 1_000_000,
defaultThinkingOptionId: "high",
});
expect(models[0].thinkingOptions?.map((option) => option.id)).toEqual([
"low",
"medium",
"high",
"xhigh",
"max",
CLAUDE_ULTRACODE_THINKING_OPTION_ID,
]);
expect(
models[0].thinkingOptions?.filter((option) => option.isDefault).map((option) => option.id),
).toEqual(["high"]);
expect(resolveClaudeDisabledThinkingForModel("claude-mythos-5-1")).toEqual({
supported: false,
fallbackThinkingOptionId: "high",
});
expect(claudeManifestModelSupportsFastMode("claude-mythos-5-1")).toBe(false);
expect(getClaudeModels().find((model) => model.isDefault)?.id).toBe("claude-opus-5-5");
});
it.each([
"claude-mythos-5-1[1m]",
"claude-mythos-5-1-20260901",
"claude-mythos-5-1-20260901[1m]",
"Mythos 5.1",
])("resolves %s to the single catalog entry", (id) => {
expect(findClaudeModel(id)?.id).toBe("claude-mythos-5-1");
});
it.each(["anthropic/claude-mythos-5-1", "us.anthropic.claude-mythos-5-1-v1:0"])(
"normalizes runtime identity without granting first-party capabilities: %s",
(id) => {
expect(normalizeClaudeRuntimeModelId(id)).toBe("claude-mythos-5-1");
expect(normalizeClaudeManifestModelId(id)).toBeNull();
},
);
});