fix(models): add Claude Fable 5.1 - #16
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Fable 5.1 released 2026-09-01 (Anthropic official announcement, https://www.anthropic.com/claude-fable-and-mythos-5-1). Model ID confirmed as claude-fable-5-1, available via Claude API/Claude Code. No deprecation of Fable 5 mentioned in the announcement, kept as-is. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Summary
data/models.jsonのclaudeプロバイダーにclaude-fable-5-1を追加claude-fable-5-1、$10/$50（百万トークン、入力/出力）、キャッシュ読込コスト75%削減。旧claude-fable-5の廃止(deprecated)についてはこの発表に記載なしのため、既存エントリはそのまま維持Test plan
node --test scripts/__tests__/validate-model-dates.test.mjs— passnode -e "JSON.parse(...)"）🤖 Generated with Claude Code