{"slug": "create-custom-review-agents-with-claude-fable-5-2-on-entire", "title": "Create Custom Review Agents with Claude Fable 5.2 on Entire", "summary": "Entire added Anthropic's Claude Fable 5.2 as a selectable model for building custom review agents in Trails, its pull-request alternative that scores code changes against user-defined criteria on every push. Anthropic reports Claude Fable 5.2 at High effort performs about level with Opus 5.5 at Max effort at roughly half the cost per task, and the model's standard API pricing is $8 per million input tokens and $40 per million output tokens, 20% below Fable 5.1's rates. Entire users can select the model in the web UI on entire.com or configure it directly from their coding agent.", "body_md": "# Create Custom Review Agents with Claude Fable 5.2 on Entire\n\nClaude Fable 5.2 is now available on Entire. Starting today, you can select it to create custom review agents in [Trails](https://entire.com/features/trails), our alternative for the pull request that puts confidence evals at the center of review.\n\nTrails let you define what a change needs to satisfy and configure custom agents to review it against those criteria. Use them to check for slop, security issues, drift, or any configuration you desire, and your custom agents score your code changes accordingly on every push.\n\nWith Claude Fable 5.2, Anthropic [reports strong improvements in coding and reasoning](https://www.anthropic.com/claude-fable-and-mythos-5-2). At High effort, Claude Fable 5.2 scores about level with Opus 5.5 at Max effort, for roughly half the cost per task. The model’s [standard API pricing](https://platform.claude.com/docs/en/models/fable-5-2/whats-new-fable-5-2) is $8 per million input tokens and $40 per million output tokens, 20% lower than Fable 5.1’s rates.\n\nMore information on [pricing for Entire](https://docs.entire.com/billing#anthropic) can be found in our docs.\n\n## Try It on Your Next Trail\n\nTo get started, select Claude Fable 5.2 when creating a custom review agent for your projects in our web UI on entire.com, or configure directly from your coding agent. As always, let us know what you think by joining our [Discord](https://discord.com/invite/jZJs3Tue4S) today.", "url": "https://wpnews.pro/news/create-custom-review-agents-with-claude-fable-5-2-on-entire", "canonical_source": "https://entire.com/blog/create-custom-review-agents-with-claude-fable-5-2-on-entire", "published_at": "2026-11-09 00:00:00+00:00", "updated_at": "2026-11-10 01:19:50.412102+00:00", "lang": "en", "topics": ["ai-agents", "ai-tools", "large-language-models", "developer-tools"], "entities": ["Entire", "Claude Fable 5.2", "Anthropic", "Trails", "Opus 5.5", "Fable 5.1"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/create-custom-review-agents-with-claude-fable-5-2-on-entire", "markdown": "https://wpnews.pro/news/create-custom-review-agents-with-claude-fable-5-2-on-entire.md", "text": "https://wpnews.pro/news/create-custom-review-agents-with-claude-fable-5-2-on-entire.txt", "jsonld": "https://wpnews.pro/news/create-custom-review-agents-with-claude-fable-5-2-on-entire.jsonld"}}