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Putting Digital Fingerprints on AI Outputs: Anthropic Develops FlashProve to Leave Model Swapping Nowhere to Hide

Anthropic is developing an open-source verification system called FlashProve, aimed at addressing whether the AI answers users receive are truly generated by the model they claim to be. In a Tuesday blog post, the company said its 'provable inference' will use cryptography to provide a mathematical guarantee for every output, confirming that it came from a specified model, similar to how cryptographic email signatures verify the sender. The system can prevent model A from masquerading as model B, close a hidden backdoor for cost cheating, and expose inflated benchmark results, striking directly at a long-standing unspoken practice in the industry.

11.7k 7 minutes ago

Anthropic's Killer Verification System FlashProve Officially Open-Sourced: Precisely Exposes Rebranded Models in 17 Seconds, Verification Speed Soars 5,000x

The prosperity of the open-source AI ecosystem has given rise to the chaos of 'rebranded models': some developers slightly repackage open-source models, swap weights, or tamper with outputs, then claim them as self-developed new models. To tackle this chaos at its root, leading AI company Anthropic has launched and open-sourced FlashProve, a provable inference system for large models. Relying on underlying cryptographic technology, the system can accurately verify a model's true identity and curb rebranding fraud.

11.5k 7 minutes ago

Models

Grok 4 Fast

Xai

$1.4

Input tokens/M

$3.5

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o3-mini

Openai

$7.7

Input tokens/M

$30.8

Output tokens/M

200

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Claude Haiku 4.5

Anthropic

Input tokens/M

$35

Output tokens/M

200

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Gemini 2.5 Flash

Google

$2.1

Input tokens/M

$17.5

Output tokens/M

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Gemini 2.5 Flash-Lite

Google

$0.7

Input tokens/M

$2.8

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Qianfan-Lightning

Baidu

Input tokens/M

Output tokens/M

128

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Qwen3-Next-80B-A3B-Instruct

Alibaba

Input tokens/M

Output tokens/M

256

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Doubao-1.5-pro-32k

Bytedance

$0.8

Input tokens/M

Output tokens/M

128

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Hunyuan-T1-20250822

Tencent

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Hunyuan-T1-latest

Tencent

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DeepSeek-V3.1

Deepseek

Input tokens/M

$12

Output tokens/M

128

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Qwen3-1.7B

Alibaba

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gpt-oss-20b

Openai

$0.4

Input tokens/M

Output tokens/M

128

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GPT-5 nano

Openai

$0.35

Input tokens/M

$2.8

Output tokens/M

400

Context Length

Qwen3-235B-A22B-Instruct-2507

Alibaba

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Output tokens/M

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Pangu-NLP-N2-128K-5.0.1.1

Huawei

Input tokens/M

Output tokens/M

128

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Pangu-NLP-N2-32K-5.0.1.1

Huawei

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GLM-4.5-Flash

Chatglm

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Output tokens/M

128

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GLM-4.5-AirX

Chatglm

Input tokens/M

Output tokens/M

128

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GLM-4.5-Air

Chatglm

Input tokens/M

Output tokens/M

128

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