Cursor Adds Claude Fable 5, Sets New Coding Benchmark Record

Cursor

Jun 10, 2026

Cursor, an AI-first code editor, has made Anthropic's Claude Fable 5 model available within its platform. The model achieved a new state of the art on CursorBench 3.1 with a score of 72.9%, surpassing the previous best by 8 points. This update signifies a notable improvement in AI coding capabilities for complex development tasks.

Cursor, an AI-native code editor, now offers Anthropic's Claude Fable 5 model. This integration sets a new performance record on Cursor's internal benchmark, CursorBench 3.1, with a score of 72.9%. This represents an 8-point increase over the previous top-performing model.

Model: Claude Fable 5
CursorBench 3.1 Score: 72.9%
Improvement Over Previous Best: 8 points

The CursorBench 3.1 evaluation focuses on tasks such as codebase understanding, bugfinding, planning, and code review. The new 72.9% score surpasses the previous leader, Opus 4.7 Max, which scored 64.8% on the same benchmark. This indicates enhanced capabilities for complex agentic coding workflows, building on prior integrations like Claude Opus 4.8 and Claude Sonnet 4.6.

Claude Fable 5 is available in Cursor, providing access to its advanced coding and reasoning capabilities. The average cost per task on CursorBench 3.1 is calculated using each model's per-million-token pricing for input, cache read, and output, allowing for performance-to-cost comparisons. This continues Cursor's trend of integrating frontier models, following previous benchmark leaders such as GPT-5.4.

75% CursorBench 3.1 score; Fable 5 high (default); Composer 2.5; GPT-5.5 medium (default); Opus 4.8 high (default); Gemini 3.5 Flash; Sonnet 4.6 high (default); Kimi 2.6; $20; $16; $12; $8; $4; $0; Average cost per task — CursorBench 3.1 performance scores across various AI models plotted against their average cost per task.

View the full update on cursor.com

Cursor

@cursor_ai12h ago

Claude Fable 5 is now available in Cursor. It sets a new state of the art on CursorBench at 72.9%, 8 points above the previous best. https://t.co/L3Wm8mSYq9

3695.1k

View on X

Every HeadsUpAI update is written based on its original source and reviewed before it's published. Read our editorial standards →

Keep reading

Cursor Integrates Claude Opus 4.8 to Boost Agentic Coding Persistence

Cursor added Anthropic's Claude Opus 4.8 to its AI-native code editor, delivering a performance jump on internal benchmarks for complex, multi-step tasks. The update introduces a thinking-token variant and a significantly cheaper fast mode, prioritizing model persistence across large codebases.

GitHub3h ago

GitHub Copilot Integrates Claude Fable 5 for Autonomous Coding

GitHub Copilot now offers Anthropic's Claude Fable 5, the first model in its Mythos class, for long-horizon, autonomous coding and knowledge-work tasks. This integration provides Copilot users with advanced agentic capabilities, enabling more efficient multi-step code resolution.

Cursor Now Supports GPT-5.4, Its Current Benchmark Leader

OpenAIMar 5

Cursor Now Supports GPT-5.4, Its Current Benchmark Leader

Cursor added GPT-5.4 to its AI coding editor, ranking it first on Cursor's internal benchmarks. The model is confident and decisive in tackling messy, ambiguous coding problems, and is strong at parallelizing work across long agent sessions.

OpenRouter Adds Anthropic's Claude Fable 5 for Advanced Agentic Coding

OpenRouter3h ago

OpenRouter Adds Anthropic's Claude Fable 5 for Advanced Agentic Coding

OpenRouter has made Anthropic's Claude Fable 5 model available on its platform. This model is designed for complex, long-running coding and autonomous knowledge work, achieving state-of-the-art performance on various benchmarks. Its availability expands access to a frontier AI model for developers building agentic applications.