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Claude Fable 5.1

Track Claude Fable 5.1 from Anthropic across launches, availability, pricing, benchmarks, capabilities, and consequential updates. This page updates automatically as substantive Superpower Daily coverage is published.

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Anthropic

Published11

Launches6

Pricing0

Benchmarks4

Original researchLatest coverageGemini 3.8 Flash Has a 13.33x Price Lead Over Fable 5.1—But Not a Proven Coding-Cost Win

Published coverage11 stories

Last 90 days11 updates

Coverage dates7 days

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What changed around Claude Fable 5.1.

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YesterdayModels

xAI Releases Grok 4.7 With Longer Reasoning at Grok 4.6 Prices

The new model is available through xAI’s API, Cursor and Grok Build, but its performance case depends on company results that do not fully line up with a published independent summary.

YesterdayModels

Anthropic Weighs New AI Model as OpenAI’s Astra Gains Ground

Reuters-reported deliberations leave Anthropic balancing competitive urgency against safety review and the cost of turning another frontier model into a product.

YesterdayModels

Benchmark Models

Brood War Bench Finds AI Agents Can Win Matches but Not Master Strategy

Codex Astra / xhigh went 18–0 in the new agent benchmark, yet its creator says no tested system moved beyond beginner-level play or reliably coordinated the work needed to build a lasting advantage.

Sep 19, 2026Business

Original researchBenchmark Business

Our Analysis Finds VCB 1–100 Scores Don’t Prove Coding-Agent Regression

The September leaderboard tests sustained modifications to an existing app under new sequential rules. Without matched reruns or a version-and-harness crosswalk, it cannot serve as a direct trend line from earlier Vibe Code Bench scores.

Sep 16, 2026Models

TypeSafe Launches Jev for Fast, Structured AI Decisions

The new model is designed to return predefined, typed answers rather than chat or code. TypeSafe says that trade can cut latency and cost, but it also defines a much narrower role than a general-purpose language model.

Sep 12, 2026Models

Benchmark Models

Specific Labs Launches Private-Code Benchmark Where Top Coding Setup Solves 38.8%

The new Real-SWE benchmark is designed to test unfamiliar production systems, not public repositories. Its first results suggest that business rules, existing architecture, and multi-service workflows remain hard for today’s coding agents.

Sep 11, 2026Models

Cognition Releases SWE-2 for Devin, Claiming Lower-Cost Coding Performance

The new model is available in Devin Desktop and the command-line interface. Cognition says it can approach leading coding results at lower reported rollout cost, but the headline comparisons come from the company’s own evaluations.

Sep 2, 2026Models

Benchmark Models

Anthropic’s Fable 5.1 Takes Benchmark Lead, but Its Top Setting Costs More Per Task

Artificial Analysis found Anthropic’s newest general model reached its highest measured intelligence score, while the token use required at maximum effort raised the cost of its own evaluation tasks.

Sep 1, 2026Models

Cursor Adds Claude Fable 5.1, Pairing a 73.4% Coding Score With Max-Effort Costs

The editor is betting that a model which keeps checking its work can carry harder coding jobs further. Its strongest published Cursor result, however, is at maximum effort—and an outside trial shows how sharply time and spend can rise at that setting.

Sep 1, 2026Models

Anthropic Releases One Claude 5.1 Model in Two Access Tiers, Cuts Cache Reads 75%

The product boundary is now access and safeguards: the general model is paired with a restricted version for cyber and life-sciences work. Anthropic estimates lower cache-read prices will cut typical token-billed costs by about 25%.

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Launches, pricing, and proof.

016 records

Launches and releases

xAI Releases Grok 4.7 With Longer Reasoning at Grok 4.6 PricesYesterday Anthropic Weighs New AI Model as OpenAI’s Astra Gains GroundYesterday TypeSafe Launches Jev for Fast, Structured AI DecisionsSep 16, 2026

020 records

Pricing and access

No material pricing update yet.

034 records

Benchmarks and evaluations

Brood War Bench Finds AI Agents Can Win Matches but Not Master StrategyYesterday Original researchOur Analysis Finds VCB 1–100 Scores Don’t Prove Coding-Agent RegressionSep 19, 2026 Specific Labs Launches Private-Code Benchmark Where Top Coding Setup Solves 38.8%Sep 12, 2026

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ResearchSep 8, 2026Gemini 3.8 Flash Has a 13.33x Price Lead Over Fable 5.1—But Not a Proven Coding-Cost WinThe current API rate cards strongly favor Google’s model, but reasoning settings, cache patterns and successful-task rates decide what an automated coding workflow actually costs.BenchmarkSep 2, 2026Anthropic’s Fable 5.1 Takes Benchmark Lead, but Its Top Setting Costs More Per TaskArtificial Analysis found Anthropic’s newest general model reached its highest measured intelligence score, while the token use required at maximum effort raised the cost of its own evaluation tasks.LaunchSep 1, 2026Cursor Adds Claude Fable 5.1, Pairing a 73.4% Coding Score With Max-Effort CostsThe editor is betting that a model which keeps checking its work can carry harder coding jobs further. Its strongest published Cursor result, however, is at maximum effort—and an outside trial shows how sharply time and spend can rise at that setting.LaunchSep 1, 2026Anthropic Releases One Claude 5.1 Model in Two Access Tiers, Cuts Cache Reads 75%The product boundary is now access and safeguards: the general model is paired with a restricted version for cyber and life-sciences work. Anthropic estimates lower cache-read prices will cut typical token-billed costs by about 25%.

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