Claude Fable 5.2 登顶 Code Arena，API 定价下调 20%
Anthropic 新版 Claude Fable 5.2 在 Arena 榜单直接从第 7 跳到第 1，Agent 净改进率是第二名 Opus-5.5 的 1.6 倍，API 价格还降了 20%。经常写代码或跑智能体工作流的人可以看看单任务成本对比，算算切换是否划算。
Anthropic 发布 Claude Fable 5.2，在 Arena.ai 的 Code Arena: WebDev 排行榜以 1836 分排名第一，位于 Pareto 前沿，中位单任务成本为 $10.85，比 Claude Fable 5.1（第 7 名）高出 95 分。在 Agent Arena 中，Fable 5.2 (Max) 以 +30.4% 的净改进率拿下第一，约为第二名 Opus-5.5（+19.5%）的 1.6 倍，数据来自 4700 个真实智能体任务会话。相比 Fable 5.1 (Max)，其净改进率从 +14.8% 升至 +30.4%，中位单任务成本从 $7.7 降到 $7.3。
细项方面，Fable 5.2 在四项信号上全面超越 5.1：Praise vs. Complaint 提升 73%，可操控性提升 33%，确认成功提升 22%，Bash 可靠性提升 14%。分赛道看，Code 从第 6 升至第 1（+34%），Work 从第 4 升至第 1（+31%），Chat 从第 6 升至第 1（+27%）。API 定价从每百万输入/输出 token $10/$50 下调至 $8/$40，降幅 20%。
对比方面，Arena Frontiers 榜单上 Fable 5.2 (Max) 以 +30.4% 领先，第二名 Claude Opus 5.5 (Max) 为 +19.5%（$5.5/任务），第三名 Gemini 4 Carbon (High) 为 +17.0%（$1.5/任务），GPT-6-Astra (Max) 以 +14.5%（$6.0/任务）排在第 6。对开发者来说，Token 价格下调 20% 加上单任务成本下降，意味着用同一预算能跑更多智能体工作流。
At #1 in the Code Arena: WebDev, Claude Fable 5.2 (xHigh) by @AnthropicAI is the top model on the Pareto frontier! Claude Fable 5.2 landed in the Code Arena: WebDev with 1836 pts, at a median cost per task of $10.85. This release is a +95 pt improvement from Claude Fable 5.1 ( #7 ). Congrats again to the @AnthropicAI team on this release! Arena.ai @arena Big news: Claude Fable 5.2 (Max) by @AnthropicAI takes #1 in Agent Arena with an unprecedented lead: +30.4% net improvement, about 1.6x the #2 model Opus-5.5, across 4.7k real-world agentic sessions from our global community. It's also #1 in Code, Chat and Work. A major leap over Claude Fable 5.1 (Max) - Rank: #5 → #1 , Net improvement: +14.8% → +30.4% - Median cost per task: $7.7 → $7.3 (6% lower). The API pricing $10/$50 → $8/$40 per million input/output tokens (20% lower) vs. The Frontiers - #1 Claude Fable 5.1 (Max): +30.4% | $7.3/task - #2 Claude Opus 5.5 (Max):+19.5%) | $5.5/task - #3 Gemini 4 Carbon (High):+17.0%) | $1.5/task - #6 GPT-6-Astra (Max): +14.5% | $6.0/task Breaking down performance across signals: Fable 5.2 improves over 5.1 across all four reported signals, with particularly large gains in user satisfaction and steerability. - #1 Praise vs. Complaint , +73%, biggest jump vs +41% the next model. - #1 Steerability: +33% - #1 Confirmed Success: +22% - #3 Bash Reliability: +14% #1 across all major categories - #1 Code: +34% - #1 Work: +31% - #1 Chat: +27% - Versus Fable 5.1: Code #6 → #1 (+19.8 %), Work #4 → #1 (+15.8 %), Chat #6 → #1 (+12.0%). Huge congrats to the @AnthropicAI team on this incredible release! 🔗 View Quoted Tweet📊 1 ⚡
This report is categorized under AITOP's "Models" desk, focusing on US frontier AI labs and Silicon Valley technology leaders. Within our cross-regional analytical framework, it directly maps to US-China foundation model benchmarks and commercialization comparison and AI developer toolchains, coding agents, and engineering workflows. Key entities and technical topics under continuous tracking include Claude, Anthropic, Claude Fable 5.2, 编程助手.
Source attribution: curated from lmarena.ai (@lmarena_ai).
