The Knowledge Layer

Every attribute sourc.dev tracks has an explanation here. What does context window mean? How is drift measured? Why does EU data residency matter? These pages answer the questions developers ask when they first encounter each data field. Each page covers the definition, why the attribute matters, how it has evolved, and how sourc.dev tracks it.

Context window

Maximum tokens a model can process in one call

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Input price per 1M tokens

Cost to send one million tokens to a model

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Output price per 1M tokens

Cost to receive one million tokens from a model

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Drift index

How much a model's behaviour has changed over time

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Uptime

Rolling availability of an API endpoint

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EU data residency

Whether data is processed within the EU

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Open weights

Whether model weights are publicly available

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API rate limit

Maximum requests per minute on free and paid tiers

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API versioning

How a provider manages breaking changes to their API

coming soon