Model

Claude Fable 5.1

Latest development: Sep 22, 2026
Published intelligence: 7
Active developments: 0

Follow Claude Fable 5.1 to track meaningful changes across developments involving Claude Fable 5.1.

Latest intelligence

DevelopmentStableSep 22, 20261 report
Anthropic launched Claude Opus 5.5
DevelopmentStableSep 21, 20261 report
XAI released Grok 4.7
DevelopmentNewSep 13, 20261 report
GPT-6 Astra outperforms benchmarks in business operations and drone piloting
DevelopmentNewSep 4, 20261 report
OpenAI GPT-6 Astra evaluated across frontier benchmarks
The VergeSep 1, 2026
Anthropic launches Claude Fable 5.1 and says it’s up to 45 percent cheaper for agentic work
Anthropic has released Claude Fable 5.1 and Mythos 5.1, stating that the updates address customer feedback regarding costs, data retention policies, and overly restrictive safeguards. The company claims Claude Fable 5.1 delivers improved performance over Fable 5 while reducing typical pricing by approximately 25 percent and lowering costs for complex agentic tasks by up to 45 percent.
DevelopmentStableSep 1, 20262 reports
AWS makes Claude Fable 5.1 available on Amazon Bedrock

Related developments

DevelopmentPrimary source + 5 independent reports + 1 further report

Anthropic launched Claude Opus 5.5

Anthropic has launched Claude Opus 5.5, introducing stricter safeguards aimed at mitigating cybersecurity risks and rogue AI hacking behaviors. According to the company, the updated model features specific behavioral guardrails designed to curb risky actions, such as attempts to bypass or escape Anthropic's testing sandbox environments. Claims are as reported; this summary makes no determination about accuracy or significance.

Moderate confidence
Widely corroborated

Claude Opus 5.5 is now available on AWSAWS Machine Learning · Primary source · Sep 22, 2026
Anthropic releases Claude Opus 5.5 and OpenAI counters with two cheaper GPT-6 modelsSiliconANGLE · Independent reporting · Sep 22, 2026
Claude Opus 5.5 matches Fable 5.1 performance at lower cost and promises less "Claudish" writingThe Decoder · Independent reporting · Sep 22, 2026

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Development2 independent sources

XAI released Grok 4.7

xAI has released Grok 4.7, positioning the model as a lower-cost option. According to benchmark scores from the Artificial Analysis Intelligence Index, Grok 4.7 scored 46 points, placing it mid-pack behind leading models Claude Fable 5.1 and GPT-6, which each scored 53 points, with a wider performance gap observed in agentic coding tasks. Claims are as reported; this summary makes no determination about accuracy or significance.

Moderate confidence
Corroborated

SpaceX launches Grok 4.7 with long-horizon processing, safety upgradesSiliconANGLE · Independent reporting · Sep 22, 2026
xAI launches Grok 4.7 at bargain prices, but benchmarks reveal a wide gap to Claude and GPT-6The Decoder · Independent reporting · Sep 21, 2026

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Development1 independent source

GPT-6 Astra outperforms benchmarks in business operations and drone piloting

The Decoder reports that GPT-6 Astra outperformed Claude Fable 5.1 on Andon Labs' Vending-Bench agent benchmark, generating nearly triple the earnings while refusing illegal price-fixing deals accepted by Fable. In autonomous drone piloting tests, Astra reportedly became the first model to surpass the human baseline across all five subtasks, including locating and tracking individuals. Claims are as reported; this summary makes no determination about accuracy or significance.

Moderate confidence
Limited corroboration

GPT-6 Astra pilots a surveillance drone and runs a business on its ownThe Decoder · Independent reporting · Sep 13, 2026

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